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Rename File(s) O. Change Config.F. Lock File(s) P. Set DensityG. Unlock File(s) Q. Make DirectoryH. Wr,}ite DOS Files R. Pick DirectoryI. Initialize Disk S. Set RAMdisk #J. Duplicate Disk V. Set Verify Flag  ?莼-}( 0  =Select Item ( for menu):@  =ɛL)1L,*L,:W@ ,,L=No such item!.}L*, -L*, BNeed new file name! BNo drive or director0}ies allowed in new name!Lock Unlock Delete Lock which file?â-#Unlock which file?ɢ-$((H @ AQ/wDel1}ete what file?Ѣ-!((H @ ANJ =Answer 'Y' or 'N'h `B L?;(( ~=( ~= =? =Y ?Lj.H @ AhR ?2}R)L*,LM/L-Lz-File to rename, new name? @ A(9', ȱ:>0{ ПFull directory name?Z"L.Dire3}ctory to be used as 'D:'? @ A(5)L.(I: ȱޝL*, BInvalid directory!L?( 4}(0Li-File source, destination? 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YA)((9'( SA)((((( @(0% =Inser;}t both disks, type = A( A((/( B(( BDrives not compatible!J(j(9'Hi''<}h(ɛy BInvalid options! @-&& @)׍&&(&&&۩ک&&&&8* <4&&&& <4=}8*8(ܭ(ݥ2C, BNot enough memory! ک&&`(Mh  & =L?&i &>}&&&mm   =  &((&թԥԍ(Ս(((( ( ((C2((?}ՠԍ((,(0"( (( =m(m( & &("L*,  ( AL4,(, =Insert DES@}TINATION disk, press =Nͼ J) b( 0K) ?((ԭ(խ( ( (((L4Drive, new density:A} YA9'ɛ BDrive unchanged.(ު90٨Ȍ(SD  ABL)xԌҭHӭ@ @ ʎӆ@B}ӭ@@ :  $ӹ @hөԥX` Aˠ =RAM disk present? =NL#8 =xlC}on or E type RAMdisk? =Aό  L   M A, A6: ' =No extra memory available!L#8L7 & & D}& =Use default config for 0)ȩ ~= =K? =NL7 =Size(K)? ? @FjFjFjFj: =Page seqE}uence? ? @o* =RAM disk drive no? = 09) `8 -8**H***) 9 Ȋ)h9 @@ʊ F}H'h(#''/'(ɛ ? @(@: 3 ʽ' L7 =Duplicated sequence number!L7 =Wrong numbG}er of entries!L7K큅쀄 =Verify WRITEs? ; =NumberH} of File Buffers? ? @  6 Lw),R( ';L*,Drive number or : =ɛLC99L60Ȍ( =Remove I}drive? =Y =Is drive configurable? =YЂ =High capacity drive? =Yy =Is drive double sided? =Y ; =TracksJ}/side? ? @#0M P( ; =Step rate? =4/ ; ';L*, =Drive size (in sectors)? ? @H(K}h *;L*,RAM disk drive no? 8L*,Verify WRITEs? ;L*, =WNPy`(`(  LABSAVE:filename,start,end(,init(L},run)) @TUH @Cp` 2< @؆8օڊ BInvalid START-END range!۩ @  @M} hԄՠAμȌZ wB04*  0$ڍXۍY֍T׍U,0LBLB #CL?ֆ׌`Load MEM.SAV from whaN}t file? 0#L*,L?Load from what file?) @TU&̩Z wB &0&-&а&𨭼INIZ'O}RV0II BNO CARTRIDGE!Ԇխ  )L?Run from what address? ?ɛ @P} BAddress must be 1-4 hex digits! BHILV n=`hh =HH` =0{a Hɛ n= n=h` nQ}=L*, = = pHH =hh`K: p `(((( i ɀ((L?(`(B'(0!HH''^R}>I^>(`^>DH(` (HI`(o5 ~= =( B( >@A (J wB0x((HHIIDDES}E B ?(CɈK(٢A ~= =( BL>(B^>((ڤ ܝHݝI VL_>L?(" B !B J) T} B(L& R XY( ?&:0H&((& ( .( & ( .(ʩ(U}`ލD&ߍEBIʎH( V0`ԩ ؠ@ȱ@ȱ)@ BError -- 139&`$8f 3AԄձG/ V}$<68i/(Ԧ`H&եԦ&&eԅheԅԊe(iL*@&&&&ԅL*@B ? 3A?*(ɛ:W}./2SX(0ȱ/.ɛ(ލ9'ި0#:Ȱ :ފ :ȱ: : CAD CAޥX}`(eޅީe߅`(` @L\A @TUȪ: BFile name not allowed!: )  i( =0+L Y}TUD BNot a disk file!(0` =Insert SOURCE disk, press =,(pӮ(A(O  1B AB1BZ} ` % 1(L/ b(de BJKO L?O` B((*(([}(`ȱޙ((:>Ȍ(`D:`OS.SYS,DOS.SYShh =L*,  VLJ C C,pLiLF#Խ٩Յ׆ \} LB`((:>Ȍ(`D:`OS.SYS,DOS.SYShh =L*,  VLJ C C,pLiLF#Խ٩Յ׆ MYDOS Version 4 User Guide Revision 4.50 ^} for Atari Home Computers Copyright (C) 1988 by WORDMARK Systems _} and distributed by Computerhouse UK MYDOS User Manual page 1 Version 4.50`} MYDOS Version 4 User Guide by Charles Marslett & Robert Puff a} I. INTRODUCTION The disk operating system described in this manual is modeled after the b}ATARI (trademark of ATARI Corp.) disk operating system (DOS 2), and may be considered an extension of the very "user c}friendly" concepts introduced with this operating system. The ATARI 810 disk drive and the ATARI 1050 disk drid}ve are well supported by the DOS 2 and DOS 2.5, but those DOSs have very limited provision for higher capacity e}double density disks (such as the XF-551), and large RAMdisks. II. SYSTEM REQUIREMENTS f} MYDOS 4.50 is intended to function as nearly as possible like ATARI DOS 2. This means it occupies as littlg}e memory as possible, supports all the system calls supported by DOS 2, and in most cases uses exactly the samh}e parameters to the system calls. This means compatibility, yet MYDOS goes far beyond this. On a standard i} single-sided, single density disk, MYDOS will read and write to a DOS 2.0 or 2.5 format, and vice versa. There are a fj}ew programs that will not run under MYDOS because of one or both of the following reasons: direct "illegal" callk}s into the main DOS or FMS code, and relying upon exact directory data (i.e., 3 digit sector counts). l}MYDOS will run on any 8-bit Atari computer with at least one disk drive (that is compatible with DOS 2). MYDOS 4.50m} has full READ compatibility with the DOS 2.5 format, but will only write to the first 720 sectors of the disk.n} (MYDOS has its own format for enhanced density disks that allow full access.) It is not compatible at this time o}with the OS/A+ version 4 format, or the SpartaDOS format. Up to eight disk drives (or nine if the ninth is ap} RAMdisk) may be accessed, but only one is required. The resident part of the operating system (DOS.SYS) suq}pports all documented functions of the DOS 2 operating system, so MYDOS supports most available software for the ATr}ARI home computers. The memory available to a program is affected only by the number of files to be opes}n concurrently: each disk file that may be open at the same time requires 256 bytes of buffer space. Unlike Atari DOS 2,t} memory requirements are independent of the number of disk drives or the sector size and density. The need for au} 256 byte buffer for each concurrently open file means that programs that keep large numbers of files open will hav}ve less memory available than under DOS 2 and as a result some programs (mostly older versions of compilers and languagew} interpreters) will not have enough memory to run. With three file buffers (which is the default) and no resix}dent drivers (such as for RS232 support), MYDOS 4.50 permits binary programs to load as low as $1F00. MYDOy}S User Manual page 2 Version 4.50 MYDOS 4.50 also contains a very z}versatile RAMdisk driver than can handle upgrades up to 1 megabyte that follow the guidelines of the expanded {}memory on the 130XE, or the Axlon upgrade for the 800. MYDOS also has a feature that will determine how much memory|} you have, and set itself up for your machine (For XE-compatible upgrades only) automatically. II}}I. MENU FUNCTIONS The menu provided by MYDOS 4.50 identifies 18 common tasks that might need to be don~}e. Rather than having to write a utility program (only a few lines of BASIC would perform most of the menu functions) } or even remember the name and format of a DOS command, these tasks can be handled by entering a single letter}. MYDOS responds with a question asking for the details of the operation (which file, what density, "are you }sure?" or whatever else it might need to know). After you enter the remaining information, the function is performed } and another prompt is displayed. You should notice two interesting things about the menu: the se}cond line on the screen identifies the disk drives present on the system and what they appear to MYDOS to be (single o}r double density, RAMdisk or high capacity hard disk). The next line describes the current default directory} (that directory used when a disk is referenced by "D:" (without a unit number after the "D" - this fe}ature will be described later). The second thing to notice is that after commands fill the screen, the menu "rolls" }off the top: some DOS programs (e.g. Atari DOS 2) keep the menu, MYDOS does not. This permits more information } to be displayed when a long sequence of commands are done, or when many files are copied. To restore the menu to} the screen, just type RETURN, and the initial screen will be restored. If you wish to abort a com}mand at any point, simply press BREAK. This will return you to the prompt. Pressing BREAK or RESET while writin}g to a disk will not cause any damage; however, the file you were writing will probably not be displayed in the direc}tory, and the free sector count may be incorrect. When entering a filename, the drive number should b}e entered, followed by a ":", and then the rest of the filename. If the drive number and ":" are not entered}, the default drive (and directory) will be used. In the [C]opy file option, entering the drive number only wil}l result in copying every file on the main directory of that drive. A drive may be specified like this: "1", "1:", or} "D1:". If you wish to specify the file or set of files to be referenced, the drive format must include a ":" }or it must be omitted entirely (for the default drive and directory). Examples: D1:Test.obj, 1:TEST.ASM, or D2TEST} (really D1:D2TEST) are valid file names, but d1:Test.obj or 1TEST.ASM are not. The file name itself is }either fully specified (referring to the MYDOS User Manual page 3 Version 4.50} entire name as it is on the disk) or includes "wild card" characters (specifying a set of files). A fully speci}fied file name consists of one to eight characters followed by a period (".") and zero to three additional "extend}er" characters. The characters in the file name may be upper or lower case letters, numbers, the underscore ("_") or th}e character "@". The only exception is the first character - it may not be a number. The "wild card" characters }are the characters "*" and "?": the character "*" or the sequence ".*" end either the 8 character or the} 3 character field in the file name and match all possible characters. The character "?" matches only one single fil}e name character. Examples: "*.BAS" will match every file ending with .BAS. "TEST?.*" will match files TEST.BA}S, TEST1.OBJ, but will not match TESTER.BAS. In addition to the main directory (containing up to 64 fil}es or directories), each MYDOS disk may also contain additional subdirectories of 64 files each. Y}ou may use one of two possible characters to separate the subdirectory name(s): the ":" colon, or the ">" grea}ter-than sign. If the main directory contained the subdirectory BAS and the file GRAPHIC1 were in the subdirectory} file BAS, it could be referenced with the filename BAS:GRAPHIC1 (or BAS>GRAPHIC1). If instead, GRAPHIC1 w}ere in the subdirectory GR.dir which in turn were in BAS, then the reference would be to BAS:GR.dir:GRA}PHIC1 (and so on with as many names as needed). Because there is no limit to the number of subdirectories on a disk (}other than the buffer size of programs using the directories and number of available sectors on the disk), a } single diskette can contain hundreds of files if necessary. Each subdirectory is a 8 sector file to its paren}t directory. Thus it is limited to 64 files or subdirectories like the 8 sector root directory. } If a disk directory includes the files TEST.ASM, TEST.OBJ, TEST.C, TEST.ALM, TEASET.DOC, TRACE.FIL, and } BETS.LST, the specification "t*.*" will not match any file name (since "t" and "T" are not the same letter to MY}DOS). The specification "T**" will match all but "BETS.LST" (since the others all begin with the letter "T"). The } specification "?E??.*" will match the first four files and the last one (since the 8 character part of the file na}me must have no more than 4 characters in it and the second character must be an "E"). The specification "*.?}" will match only the file TEST.C (since it is the only file name with a single character in the 3 character fiel}d). The specification "????E**" will match the files TEASET.DOC and TRACE.FIL and none of the others (since the 8 ch}aracter part of the file name must have at least 5 characters and the fifth must be an "E"). Note that MYDOS d}oes not always require the "." period to separate the extender from the 8 character filename. Examples: FILE}NAME.EXT could be entered as FILENAMEEXT; TES*.* could be TES**, but TEST.* could NOT be entered as TEST*. } IV. THE MENU COMMANDS A. List a Directory or a Set of Files MYDOS User Manual pag}e 4 Version 4.50 The "A" command will list the files on a disk with their sizes, fo}llowed by a line specifying the number of free sectors on the disk. If the line starts with a "*", the file has been l}ocked and may not be modified or deleted without first being unlocked. A ":" before the file name marks those f}iles that are subdirectories. These files cannot be read or written as other files but only accessed as di}rectories or deleted (if the directory is empty). File lengths and the number of free sectors are reported as 4 digi}t decimal numbers (most other Atari DOSs report the values as 3 digit numbers). If the number of free s}ectors on a drive exceeds 9999, the free sector line will contain a 5 digit number, and be one character long}er. If a file is longer than 9999 sectors, the blank between the file extender and its sector count will contain the m}ost significant digit (the line size does NOT change). No indication is made of the format of the fil}e but ATARI DOS 2.0, 2.5, and MYDOS are the only three supported file formats. SpartaDOS or OS/A+ Version} 4 files must be converted to single or double density Atari DOS 2 files first in order to be usable from MYDO}S. See Section 6 for further directory information if you need more detail. The "A" command will }list the directory information to the screen if only one file specification is entered. If two are entered, the s}econd is taken as a destination file and will be overwritten (or appended to if the /A flag is used) with the direc}tory data. Use "2,D1:DIR.TXT" to save the directory data of drive 2 to a text file DIR.TXT on drive 1. The entry} "1,P:" will give you a printout of the directory of drive 1. To list the files in a subdirectory,} enter the name of the directory followed by a ":" colon or ">" greater-than sign. For example, "1:TEST:BAS:}" will list the files in the subdirectory BAS which in turn is in the subdirectory TEST in the main directory of } the diskette in drive 1. Using "D1:TEST>BAS>" will achieve the same results. B. Run the Cartridge} The "B" command returns control to the cartridge in the left (or only) cartridge slot. If no cartri}dge is present, an error is displayed, and nothing happens. No additional information is required, so } if a cartridge is present, it is entered after loading MEM.SAV (if enabled) or immediately. C. Copy a }File or a Set of Files The "C" command is used to make another copy of one or more files of data.} The two file specifications asked for after entering the "C" identify the source and the destination of the informat}ion being copied. Either may be fully specified disk file or a device MYDOS User Manual page 5} Version 4.50 specification (such as E:, P: or one of the RS232 ports R1: to R4:). The }destination may be a set of disk files (specified with "*" and "?"s) only if the source specifies a file name for the }destination to use. The source may be a set and the destination a single disk file, but unless the "/A" modifier }is specified to append each copied file to the end of the previously copied files, only the last source file will }remain on the destination disk. Note that the "C" command always uses the full memory space for a copy }operation (unlike ATARI DOS 2) and as a result, it will always invalidate MEM.SAV if it is used. Any pending progr}am cannot be restarted after a "C" or "J" command. There are several options when entering files to cop}y. As with all filename inputs, the default drive and directory (whatever "D:" is equal to on the top stat}us line) will be used if Dn: is not specified. Using "/Q" at the end of the line will query you for each source f}ile it finds (useful for copying certain files but specifying *.*) if you wish to copy it. Using "/S" will copy all f}iles EXCEPT those with the first letter of the extender being "S" (will omit all *.S??). This emulates DOS 2.0's} [O] copy file option, and is useful when you want to copy all files except .SYS files. The last option is the "/X}" parameter. This will prompt you for disk swaps, even if the source and destination drives are not the same number. He}re are some examples of using the [C]opy file(s) command: "TEST.BAS" will copy the file TEST.BAS on the }default drive (and directory) to the same drive, but prompt you for the destination. (Same as the [O] command i}n DOS 2.0.) "D1:TE*.*,3" will copy all files on drive 1 starting with "TE" to drive 3. "D4:DIR>*.TXT,E:/Q"} will copy all files in the DIR directory of drive 4 ending with .TXT to the screen, but will query you before each one.} "2:ADD,2:LIST/A" will append the data in the file ADD on drive 2 to the file LIST on drive 2. D}. Delete a File or Set of Files The "D" command will remove all files that match the file specifi}cation entered, asking for confirmation before each one is removed. The "Delete file xxx?" prompts may be disabl}ed by adding "/N" to the filename. In this case, all the matching files will be removed "quietly", and the on}ly further indication you will see is the prompt for the next command. E. Rename a File or Set of Files} The "E" command changes the name of the source file or files to match the specification in the de}stination. Unlike other file specifications, the destination specification MUST consist of a single file } name: it must not contain any directory names or a disk drive number. For example, "D2:TEST>BASIC>NOTPNT.BAS,RANDIO.B}AS" is MYDOS User Manual page 6 Version 4.50 the line entered to cha}nge the name of a file in the directories "D2:TEST>BASIC>". To change the name of the directory "BASIC" to "A}TBASIC", the line would look like "D2:TEST>BASIC,ATBASIC". One word of caution: Never rename more than one file to ano}ther name without wildcards in the destination. For example, renaming "*.*" to "TEST" would rename EVERY file t}o "TEST", making it impossible to retrieve files other than the first one! F. Lock a File or Set of Fil}es The "F" command limits access to the files identified. "Locked" files may not be deleted, renam}ed, added to, or replaced without being first unlocked with the "G" command. When a directory is listed, the} files that have been locked will be marked with an "*" in the first column. The files that are locked may be read or lo}aded and executed normally, only modification or removal are prohibited. A locked directory cannot be delet}ed or renamed and no files may be written to it. The files already in it are not locked however. MYDOS }will not ask you for confirmation on each file, "Lock xxx?" unless you specify this feature by adding "/Q" to the fi}lename. G. Unlock a File or Set of Files The "G" command removes the limitations imposed o}n a file when it is "locked" using the "F" command. It does not alter the file or otherwise change the way th}e file is accessed or used. The same function may be performed in a program through the CIO function to "unloc}k" a file. As with the "F" function, MYDOS will not ask you for confirmation with each fi}le to unlock, unless you specify the "/Q" parameter after the filename. H. Write MYDOS to a Disk } The "H" command is used to make a bootable copy of the current MYDOS 4.50 files in memory. The two files }created or rewritten are "DOS.SYS" and "DUP.SYS". "DOS.SYS" is the permanently resident file management routine } accessed through CIO and the small interface package that loads and saves MEM.SAV (an image of the part of memory} used to hold the nonresident part (DUP.SYS) of MYDOS), and the code to load the menu portion of MYDOS ("DUP.SYS"}). The file "DUP.SYS" is a standard binary load file containing the part of MYDOS that is overwritten when a} program is loaded into memory. Neither of these files may be interchanged with any other version or type of disk} operating system; both should be treated as a single object. Never copy only DOS.SYS or only DUP.SYS to a }disk without copying the other, unless you will never access the DUP.SYS menu (called by typing "DOS"). The }files written to the disk by the "H" command will reflect the configuration parameters currently in memory, which may} MYDOS User Manual page 7 Version 4.50 be different from the ones acti}ve if the system were rebooted from the master disk again. (See Section IV.O., configuring the system, for the } definition of the configuration parameters provided in the system and how to specify a modified configuration.) } I. Initialize a Diskette The "I" command is used to "Format", or prepare a new disk for use} with the MYDOS operating system, or to remove all the files on an old disk. The result of the "I" command is a comple}tely empty disk. The only data on the diskette is that system provided information defining the space availa}ble and the empty main directory. If the drive number is followed by a "/N" parameter, the diskette will not be } reformatted, but just "erased" (the directory sectors will be rewritten). If a disk has recently been format}ted, this is the fastest way to remove all the files on a diskette, rather than to use the "D" command. Use this o}ption ONLY if you know the disk was good, for this does not verify the integrity of the disk. Due to a bug in som}e hard disk interfaces, this "/N" parameter may be needed to initially format the hard disk partitions. } A diskette may also be formatted in the Atari 1050 enhanced format by responding to the question "(Type} [A] to format in Enhanced) Type [Y] to format drive x:" with a "A" (presuming the drive is a 1050 drive o}r compatible with the 1050). The diskette is, however, not compatible with the diskettes similarly created by DOS  } 2.5. The MYDOS diskette will not be readable by DOS 2.5, but DOS 2.5 enhanced disks can be fully read by MYDOS.  } An additional note: it is a good idea to set the density of the drive you are about to format, unless the } drive is not capable of double density. (see the "P" command for information on setting density.) Otherwise }, MYDOS will format the drive in the density of which it was last accessed. J. Duplicate a Diskette  } The "J" command copies all the information from one diskette to another. The information to be copie}d form the source diskette is determined by specifying a starting and an ending sector number. If the range is n}ot stated, the sectors marked as in use in the DOS bit map (on the VTOC sectors) are copied. The VTOC may be constructe}d by Atari DOS 2, any version of MYDOS or any other compatible operating system. Specifying a s}ector range is done by adding two numbers separated by a dash and enclosed in parentheses to the end of the } drive specification(s). For example, to copy sectors 19 through 54 (tracks 1 through 3) from drive 1 to drive 3} without formatting the diskette in drive 3, the command line could be "1,3/N(19-54)". To copy the entire di}sk from drive 1 to drive 2 after formatting the diskette in drive 2 the command could be "1,2(1-720)". This is the} MYDOS User Manual page 8 Version 4.50 proper way to duplicate a non-MYD}OS compatible diskette (of course, copies of "copy protected" disks will not normally be usable after copying b}ut data disks for some word processors and games can be backed up this way). Enhanced density disks may be duplicat}ed in the same manner: "1,2(1-1040)". If the destination disk is already a properly formatted } diskette, the "/N" modifier may be entered after either drive number to skip the formatting of the destinatio}n drive. Otherwise, the destination diskette will be formatted before the data from the source is copied to }it. That is, either "1/N,2" or "1,2/N" will copy from drive 1 to drive 2 without first formatting the diskette in } drive 2. Note that the "J" command, like that in ATARI DOS 2, will use all of available memory to} duplicate the diskette: this means that if memory has been saved using the MEM.SAV file, it will no longer be v}alid. Any pending program cannot be restarted after a "C" or "J" command. K. Save Memory to Disk } The "K" command builds a binary load file containing the data from the memory area specified, as well } as adding an initialization and a run vector address if specified. If the file is not to execute an initializati!}on routine on being loaded, the initialization vector should be omitted. If it is not to run on being loaded, the "}run vector should also be omitted (trailing commas need not be entered). If either vector is entered as zero, th#}at is equivalent to omitting it. Note that the starting and ending addresses of the program and both entry poi$}nts are all specified as hex numbers. You may append data to another file by using the "/A" parameter. This command %}may also be used for just adding a Run address to a binary file. Example: "D1:PROGRAM.OBJ/A,0,0,,4000" would add &} the run address of $4000 to the program "PROGRAM.OBJ" on drive 1. If MEM.SAV is active when the "'}K" command is entered, the MEM.SAV file is loaded before writing the file to the disk. L. Load Memory (}from a File/Disable MEM.SAV The "L" command takes a binary load file from the disk and loads it into m)}emory. The load file's initialization routine(s) will be executed and the program started at its run address unless *}the "/N" parameter is added to the file name. If the file is not a binary file, you will be returned with an "+}Error -- 180". A binary file that is corrupted will return an "Error -- 181". This command also disab,}les the MEM.SAV feature before loading and executing the program. To just disable MEM.SAV, press "L", then [RETUR-}N]. MYDOS User Manual page 9 Version 4.50 M. Run at Address.} The "M" command is used to enter a program loaded without a run address, or to jump into any program/} without the need for a return address. It may be used to restart the computer (loading the AUTORUN.SYS f0}ile, if any, or a new DOS, etc...) by specifying "E477" as the jump address. If MEM.SAV is active (enabled with th1}e "N" command and not since disabled by the "L" command), the contents of memory will be restored from MEM.SAV2} before jumping to the address specified. N. Load MEM.SAV from a File/Enable MEM.SAV Th3}e "N" command takes a binary load file from the disk and loads it into memory, just as does the "L" command. The differ4}ence is this command enables the MEM.SAV file before loading (and executing) the program; and when control is5} returned to MYDOS, the contents of memory will be saved back to MEM.SAV. To just enable MEM.SAV, 6}first enter this DOS menu (by typing "DOS" in BASIC), then press "N" and [RETURN]. O. System and Drive 7}Configuration The "O" command is used to specify the type (at least logically) of the disk drives on8} your computer and is also used to specify several system configuration parameters such as the number of file 9}buffers provided or whether a RAMdisk is present. The system configuration functions, which are not specific to:} individual drives, are selected by pressing [RETURN] at the prompt "Drive number or RETURN:". The following;} table explains all the prompts for system configuration: Verify WRITEs? N=do not write with<} verify, else do verify Number of File Buffers? The number of disk files that can be open =} at once (RETURN = 3) RAM disk present? N=no RAM disk on the system (skips the >} next 4 questions as well), else the RAMdisk is enabled, and the next questions ?} determine what kind it is. [A]xlon or [X]E type? A=Axlon, (RETURN)=XL or XE type. If @} Axlon, skip the next question. Use default config for (x)K? N=no, specify parameters. "Y" or A} [RETURN] uses the parameters the DOS generated for your type of machinB}e. Note that the "x" is replaced by the amount MYDOS User Manual page 10 C} Version 4.50 of total memory MYDOS thinks you have. D} Skip the next three questions if answered yes. Size(K)? Size E}of the RAMdisk area in K (8 single density sectors = 1K); this must be a F} multiple of 16 (NI 256K upgrade=192 OR 128, AXLON=112, default or 130XE=64). CoG}ntrol Address(HEX)? Address of the memory map control port: a RETURN specifies $D301 for the 1H}30XE. For the AXLON RAMPOWER 128, enter "CFFF" here. Page sequence? [RETURN]I} if using a standard Atari 130XE or equivalent RAMdisk. Other standard values J} are (1) for the Newell industries upgrade, (2) for the RAMBO from ICD, and (5) for K} Axlon or compatible boards. The most general response is to list the L}page numbers to be used as 2 hex digits each, separated by commas, M}and continuing if necessary by ending the line with a comma. The seN}quence is ended with a "0" if the RAMdisk is 130XE compatible, and O}with a "FF" if it is Axlon compatible. RAM disk drive no? Drive number used to access the RAMdisk P} (RETURN for drive 9 or a drive number 1-9) A [RETURN] does not retain the current value whQ}en responding to these questions; it changes the setting to a generally acceptable default. Even a BREAK orR} RESET will not leave the configuration unchanged. If the configuration process is aborted for any reason, andS} you wish to retain your old configuration, you should reboot the computer or properly complete the configuration beforT}e doing anything else. If instead of a [RETURN], a drive number had been specified, then that U}drive would be reconfigured. The first question identifies whether the drive is to be included in system initializatV}ion (and thus be available for later use). If a non-existent disk is included, it does not cause any problems with W}the system: it simply causes that disk to be examined each time the system is booted and reset (adding perhaps a X} second to the time it takes to boot MYDOS). If drive is excluded from the system, no further questions are asked. OtY}herwise, the second question asks if the drive is configurable: that is, is it like the ATARI 810 drive (with a fZ}ixed configuration) or is it like the PERCOM or ATR8000 drives. If the disk is not configurable it is assumed t[}o be a 720 sector, single or double density ATARI 810/815/1050 disk drive. The third question i\}s whether the drive is a high capacity drive (does it use the modified configuration for non-floppy disks). This ]}is for hard disks. This should be answered "N" if the drive is a MYDOS User Manual page 11 ^} Version 4.50 floppy disk drive, and "Y" if otherwise. If this question is answered "Y", the only _}remaining question is the size (in sectors, from 256 to 65535) of the drive. Drives up to 16 million bytes (Megab`}ytes) capacity can used with MYDOS, and larger drives can usually be partitioned to appear as two or more a}drives of less than 16 million bytes capacity. See your hard disk manual for more information on this subject.b} Drives that have not been configured can still be accessed. This configuration is necessary ONLY when fc}ormatting hard disks, and when using PERCOM or ATR8000 interfaces. Other than the above, the drive configuration d}is not necessary - MYDOS will figure out by itself what the disk is capable of by its format. If the fe}irst three answers are "N" (do not exclude the drive), "Y" (it is configurable), and "N" (it is not a high capacity drif}ve), the configuration is asked for: Is the drive double sided, how many tracks are there on the each side of thq}F#DOS SYSF6'DUP SYSF]DOC 001FADOC 002F-OAUTORUN SYSF |FONT SETF DOC 000e disk, and at what speed can it move the read/write head across the disk (what is its step rate). The first quesr}tion is answered with "Y" or "N" ("Y" meaning "yes" it is a double sided drive, and diskettes formatted on it will be dos}uble sided). The second question is answered with 35, 40, 77, or 80 followed by a [RETURN]. If you have t}IBM PC/AT style high capacity disk drives (1.2Mb capacity) you may use 77 of the 80 tracks in high capacity mode u} providing 1 Mb capacity by selecting 77 tracks. No other numbers are accepted. The answer to this question speciv}fies both the type of drive (8 inch/high capacity 5 1/4 inch, or standard 5 1/4 inch) as well as the number of trw}acks per side. This answer is very important to the operation of the drive. The last answer ("Step Rx}ate?") is entered as a code: use the following table and the drive specifications to determine the proper value: y} Code value 8 inch rate 5 1/4 inch rate 0 3 ms/track 6 ms/track (XF-551) z} 1 6 ms/track 12 ms/track 2 10 ms/track 20 ms/track 3 15 ms/track {} 30 ms/track P. Diskette Density Selection The density used for most MYDOS commands is |}determined by the data written on the diskette and the operator need not worry about setting it. The "P" comman}}d is provided to allow forcing the density setting for the format ("I") command, and to permit setting the de~}nsity for disk drives and systems that do not automatically recognize the density of a diskette when read}ing sector 1 (for example, Indus GT drives). Type the drive number, followed by "S" or "D" to set the de}nsity of the drive. Example: "2,D". MYDOS User Manual page 12 Version 4.50} Q. Create Subdirectories When a diskette is formatted, an empty directory (the highest} level or root directory) is created. This directory is capable of holding up to 64 files or other dire}ctories. If additional directories are installed in this directory, each of the additional directories can co}ntain up to 64 files as well. A subdirectory is installed in an existing directory using the "Q" command and} responding with the filename of the new directory. For example, if "TEST" and "BAS" are two subdirectories in t}he root directory of the diskette in drive 1, "1:TEST:COMM" or "1:BAS>COMM" would create a new directory in the} "TEST" or "BAS" directories respectively. "1:NEW:COMM" would not create a directory, however, since the} directory "NEW" does not already exist. A "Q" command with the response "1:NEW" would create it, however, }and a second "Q" command with the response "1:NEW:COMM" would then create the new directory called "COMM" within} the directory "NEW". Each directory takes up 8 sectors, and after it is created it may only be refe}renced as a directory (followed by a ":" or ">"), or deleted. It may only be deleted if it is empty (if it has no files }in it). A directory may be emptied by using the "D" (delete) command and specifying the files "*.*" or "*.*/N" to }remove all the files in the directory. You can most safely do this by specifying the full name of the directory: }D5:MSGBASE>SEPT1983>*.*/N for example. Now to delete the SEPT1983 subdirectory, simply delete "D5:MSGBASE>SEPT1983" (no}te no trailing ":" or ">"). R. Set the Default Directory The "R" command is used to se}lect a directory to be used when a file is referenced without the drive number: that is, when file names such as "}TEST1.BAS" or "D:NEWCODE" or even ":BIGFILE" are used, they are assumed to be in the default directory. Programs run un}der MYDOS can access the contents of the current default directory by using a file name of the form "D:..." w}ithout the drive number explicitly entered. They may also set the default directory by calling the CIO Function c}ode 41 (set directory) routine. The directory is set by inserting the diskette with that directo}ry on it into the desired drive, then entering the file name of the directory with no trailing ":" or ">". } If the diskette in the drive containing the default directory is replaced, or if the default directory on a diske}tte is deleted, the default should be redefined. The one exception is if the default directory is the root } or main directory on a diskette: this is because the root directory is at the same location on all diskettes. } V. FILE MANAGER FUNCTIONS PROVIDED THROUGH CIO MYDOS User Manual page 13 } Version 4.50 This part of the documentation is included in the technical notes of MYDOS, so c}onsult those notes for details. VI. CIO FUNCTION CODES PROVIDED BY MYDOS 4.50 This part of} the documentation is included in the technical notes of MYDOS, so consult those notes for details. }VIII. MYDOS MEMORY MAP This part of the documentation is included in the technical notes of MYDOS, }so consult those notes for details. IX. CUSTOMIZING A SYSTEM DISK Much of this section} is covered in the technical notes, but here are some things pertinent to all users. RAMdisk Configurat}ions The RAMdisk driver included in MYDOS 4.50 will automatically configure itself on XE compatib}le memory upgrades. It is suggested you use this feature. If you REALLY want to set up the system to your specifica}tions (such as configuring it to NOT use the banks BASIC XE uses), the power is available. This is necessary w}hen AXLON compatible upgrades for the 800. The default page sequence uses the standard XE banks first. } The file RAMBOOT.M65, the MAC/65 assembler source code for the file RAMBOOT.AUT, is an AUTORUN.SYS file that si}mulates the operation of Atari DOS 2.5 and its RAMdisk handler. It "formats" the RAMdisk and copies DUP.SYS to }it, as well as setting the RAMdisk unit number and the unit used to access the DUP.SYS and MEM.SAV files to 8. } By modifying the code in the source file and creating a modified AUTORUN.SYS file, the drive used to save MEM.}SAV and fetch DUP.SYS can be modified, other files than just DUP.SYS can be copied to the RAMdisk when the sys}tem is booted, or any other operation could be performed that you find useful. Number of Files Open at }Once The number of files that may be simultaneously open is set with the same byte as in ATARI DOS 2: }location $0709 (decimal 1801). This byte contains a number from 1 to 16 setting the number of disk files that may} be open at the same time. Normally it is set to 3, the smallest number that supports all the functions in the M}YDOS menu. Specifically, a copy from one disk file to another requires three MYDOS User Manual } page 14 Version 4.50 open disk files. The value in the distributed version of MYDOS 4.50 } is three; to permit more or fewer files, use the "O" command followed by a RETURN. To permanently change the maximum} number of files, use the "H" command to write a modified MYDOS system to a disk. Each file that may be open at }one time requires the allocation of a 256 byte buffer, so setting this value to 7 (instead of 3) will cause MYDOS to } be 1024 bytes longer than before, and the programs loaded must begin no lower than $22E9 (instead of $1EE9). In corr}esponding fashion, by setting the value to 1, a BBS program can be loaded in with 512 bytes of additional memory }if only one disk file is ever open at one time (commonly true of bulletin board programs). Controlling }the Disk Drives Accessed by MYDOS Like ATARI DOS 2, MYDOS automatically identifies the disk drives that } are present when booted up initially and any time it is reinitialized (some programs do this on exiting to the} DOS and it is always done if the RESET key is pressed). MYDOS 4.50 is distributed with drives 1 and 2 configu}red, all others are omitted in order to speed up the booting process. To modify the maximum configuration MYDOS} will use, invoke the "O" command for each drive to be added to (or removed from) the system. Pressing the RESET key} will then use this value to redefine the drive. To permanently change the maximum drive configuration, use the} "H" command to write out a new copy of MYDOS back to your system disk. Selecting or Disabling Write-wi}th-Verify MYDOS 4.50 is distributed with the verify disabled, to speed up writing. Most drives (and dis}ks) are very reliable, and function with no problems with the verify disabled. However, if you experience prob}lems, or want to be 100% sure your data written will be good, use the "V" command to enable verify. As with DOS 2}.0, the byte at location $0779 (1913 decimal) controls all write operations to the disk. If the value "poked}" into it is $57 (87 decimal), then all writes will be read back to verify the action was successful. If the valu}e "poked" into $0779 is $50 (80 decimal) then writes will be assumed successful, and will be performed in about one} third the time taken when verify is enabled. Note that this address is not the same as in MYDOS 4.0 and 4.1 }(where it was $0770 or 1904 decimal). To permanently alter the DOS, rewrite it back to the disk using the "H" comm}and after changing it. X. DISK DRIVE INTERFACE (via SIO) This information is covered in the }technical notes for MYDOS. XI. RAMDISK INTERFACE This information is also covered in the tec}hnical notes. MYDOS User Manual page 15 Version 4.50 XII. INI}TIAL INSTALLATION INSTRUCTIONS The following checklist is a procedure to bring up MYDOS on a new har}dware configuration. It should be done with an un-modified copy of MYDOS 4.50, and care should be taken to perform t}he steps in exactly the order specified. HOW TO GET FROM THE DRIVEWAY TO THE FREEWAY: 1. Before }turning on your computer and disk drive, make sure that you do not have a cartridge installed in the computer. } 2. Turn on the disk drive, and when it stops spinning, insert the MYDOS master diskette. Close the door. }3. Turn on the computer (with OPTION held if using an XL or XE computer). After several seconds, the MYDOS menu sho}uld appear on the screen. A prompt "Select Item (RETURN for menu):" will be displayed. 4. If you h}ave a standard 2-drive system with single sided 40 track drives and either no RAMdisk or the standard Atari } 130XE memory configuration, continue with step "6". 5. Configure each of your disk drives only if they are hard } disks or special double-sided (XF-551) or more than 40 tracks by entering the "O" command followed by the dr}ive number, and answering the questions the program asks you. 6. If you need to run a program that requires }more than 3 disk files active at a time or you otherwise want alter one of the default parameters, press }the "O" key followed by the RETURN key and answer the system configuration questions. This is also where }the RAMdisk configuration needs to be entered if it is not a standard 130XE RAMdisk. **** 7. Now, insert a b}lank diskette in the disk drive and format it with the "I" command (remove the write protect tab if the d}iskette is write protected -- but first ask yourself why you put it there in the first place!). If an error message} is displayed, insert another diskette; the first is bad. 8. Write the system files DOS.SYS and DUP.SYS to t}he newly formatted diskette with the "H" command and skip to step "10" if you do not have an ATARI 130XE }computer or some other RAMdisk usable with the MYDOS RAMdisk driver. 9. If you have an ATARI 130XE computer }or have another kind of RAMdisk and wish to use the MYDOS RAMdisk driver, copy RAMBOOT3.AUT on the master} diskette to AUTORUN.SYS on the new diskette (use the "C" command, and if you have only one drive, enter }the command line "RAMBOOT.AUT,AUTORUN.SYS/X" when MYDOS asks for the file names).** 10. This is now your prim}ary system backup disk: place a write protect tab on it, label it, and use the "J" command to make as man}y working boot disks as you need from it. NOTES: MYDOS User Manual page 16 } Version 4.50 The RAMBOOT3 program will first format your RAMdisk, then copy the files }in a directory called RAMDISK on your boot disk to the RAMdisk if such a directory exists. To take advantage }of this feature, use the "Q" command to create the directory and copy the files you want on the RAMdisk to it.} If you do not want your ramdisk formatted each time you boot-up, which is not recommended, skip this step (step 9}). Just be sure you format your ramdisk before using it. ** -- The source file for the RAM disk boot is als}o included; if you feel the urge, modify it to copy other files to the RAMdisk in addition to DU}P.SYS (take out the MEM.SAV setting code, too, if you need the space) or perhaps add a call to change } the default disk drive to D8:. Just remember that if you string together several autorun files, only the last wi}ll have its RUN address invoked. **** -- NEWELL INDUSTRIES 800XL UPGRADE -- this RAMdisk can use } page sequence 0, page sequence 1, or the default. The E3/E7/EB/EF pages can be reserved for BASIC/XE in } extended mode by setting the RAMdisk size to 128K and the sequence to 1. Enter Size=128 (or 192 if you }will not be using BASIC/XE often), Control address=D301, and Page sequence=1. In the second case this} will use the area also used by BASIC/XE, but it will access it only after the first 128K are used up}. By setting the size to 128K, BASIC/XE and the RAMdisk are fully separate and cannot interfere with }each other. **** -- AXLON RAMPOWER 128 for the Atari 800 computer -- MYDOS 4.50 comes configured for t}he Atari 130XE -- if you are installing it on an 800 with an Axlon RAMPOWER board, you must disable t}he 128K mode on the RAMPOWER board until you have configured the MYDOS RAMdisk code by entering Size=}112, Control address=CFFF and Page sequence=5. Then write the DOS back to a new diskette, copy AUTORUN.SYS } to it, switch the RAMPOWER board back to 128K and boot up the new diskette. MYDOS Us}er Manual page 17 Version 4.50 XIII. ERROR CODES AND THEIR SOURCES } 3 Last byte of file read, next read will return EOF (MYDOS) 128 Break Abort (OS ROMs) 129 IOCB already o}pen (OS ROMs) 130 No such device defined in the system (OS ROMs) 131 Write-only IOCB, cannot read (OS ROMs) } 132 Invalid command (OS ROMs) 133 Device or File not open (OS ROMs) 134 Invalid IOCB reference (OS ROMs) } 135 Read-only IOCB, cannot write (OS ROMs) 136 Attempt to read past end of file (MYDOS) 137 Truncated reco}rd (OS ROMs) 138 Device Timeout (OS ROMs) 139 Device NAK (serial bus failure, OS ROMs) 141 Cursor out of} range for graphics mode (OS ROMs) 142 Data frame overrun (serial bus failure, OS ROMs) 143 Data frame checksum} error (serial bus failure, OS ROMs) 144 Device I/O error (in peripheral hardware, OS ROMs) 146 Function not pr}ovided by handler (OS ROMs) 147 Insufficient RAM for graphics mode selected (OS ROMs) 160 Invalid Unit/Drive Nu}mber, zero or greater than 7 (both MYDOS and OS ROMs) 161 No sector buffer available, too many open files (}MYDOS) 162 Disk full, cannot allocate space for output file (MYDOS) 163* Write protected or system error - disk }is not readable (MYDOS) 164 File number in link does not match the file's directory location (MYDOS) 1}65 Invalid file name (MYDOS) 166 Byte not within file, invalid POINT request (MYDOS) 167 File locked, cannot }be altered (MYDOS) 168 Invalid IOCB (MYDOS and OS ROMs) 169 Directory full, cannot create a 65-th entry in a di}rectory -- entries may be used for "lost" as well as real files (MYDOS) 170 File not in director}y, cannot be opened for input (MYDOS) 171 IOCB not open (MYDOS and OS ROMs) 172* File or directory of same name }already exists in parent directory, cannot create (MYDOS) 173 Bad diskette or drive, cannot format diskette} (MYDOS) 174* Directory not in parent directory (MYDOS) 175* Directory not empty, cannot delete (MYDOS) 180*} Not a binary file (MYDOS) 181* Invalid address range for binary file, END}ntire filename of the file it is processing, in directory-style (no period between name and extender). If your screen ?}goes into attract mode, simply hit SHIFT CONTROL A. These are the following errors that may occur i@}n a file: COLLISION - the file has a sector that has already been used by another file, VTOC, or directory. A}BAD LENGTH - The directory length does not compare to the actual file length: probably a result of a collision. LOOB}P ERR - the file "loops" back to itself. BAD RANGE - The sector link points to a sector less than 4 or greater thanC} what is available on the disk. Err #144 @ Sec #xxx - A bad sector on your disk. INVALID FILENAME:xxx - an illeD}gal filename (bad bytes). Any bad files SHOULD be deleted by this program. If they are not, they will be ovE}erwritten by files written TO the disk in the future. At the end, the VTOC Fixer will display the number of secF}tors used in files (not really that meaningful), the number of sectors that are now free (the newly-generated free sectG}or count), the old free sector count (so you can see the difference if any), and the initial free sector correction (caH}used by an incorrect format to begin with). If your VTOC and free sector count agree with the value the program calculateI}d, it will be displayed. Otherwise, it will ask you if you wish to write out the new VTOC. You SHOULD answer "Y" to tJ}his question, which will correct the errors. If for any reason you do not want this, type "N" or RETURN. AnK}d that's it! This program in essence takes the place of copying all files to another disk, formatting the original, and cL}opying the files back. Run this whenever you think a drive might not be set-up right, or have a bad free sector count.M} You cannot hurt the drive by running this - it can only help! It has really helped me, and saved alot of hard disks N}here. can only help! It has really helped me, and saved alot of hard disks 3?U (c)1983 Action Computer Services  B JKIHiDiELV`L@P} @ BLV`Ll@h@l Li@ &` Fj`8冨凪` @EӅӥQ} @`ʆǪƩ Ɛee` @ƦʆǢ &Ɛeǐ @ @L@ @'&&&8儨児R}祂*L@&&*ń8&&L@ .A`hihiHHȱȱLv@c !#3`S}Li@JJJJ`H v@h`Hȩh E@LA N@LA ?LA @LA @H8T}`HhHh 2BLA BHI V䅠LA LiB @LAԆ ؠPIPP`U} BP @LA BLB BLB BLBH- B8塪墨hLB BLB BLB BȹP`V}텠8堨塪 B芨Oȩ-`PP aBP棩 Ѥģ0-ģ6000:,80H W}& &ehe&eģ0ʥ 8堅塅`$ B&*i0:0i BƦ`¢ 护X}°ڱ%ȱ%E BL3D担CS %BL3DI BL3DH CL3D BL3D &B V ANLMȑY}` MLN%B VLAS:DE:DH B DD A Bh)0IDDLA[\ZUVT` EDDZ}` ELB ELgB ELB) ` ELB @` 0d i@ҥ `2)2[}ҩ`҅`0)9E`@0)ӈJJJJ)`Ѕ`ȱ`` Fȥ`Hh\}ƣĢ`ƥĤ`Ѣ F`ȱѢĦ`膡`]}`ťƤe8夰LF Ƥ8`ŦeѠe桊LF$^}_}`}a}((b}(LFIBIBI G`LVIj E8GGGG @GG BLI D:FONT.SEc}TI AQIPIPIQILI gBRILI B`GmPIGmQIRI FPIйQILI B`L JJJd}ȌJ0JuJL[JJȌJJDJDJJJLPJJJL4JJJLJ`LaJ ELxJ ˠҢJm B J`ULJe}JJJLJ D:DOC.000J mJ*(mJLJ D:DOC.001JȑȈ mJ*(mJLJ D:DOC.002Jȑ򈑮 mf}J*(mJL&K D:DOC.003Kȑ mJ*(mJLPK D:DOC.004KȑF mJ*(mJLzK D:DOC.005Kȑp g}mJ*(mJLK D:DOC.006Kȑ mJ*(mJLK D:DOC.007KȑĈ mJ*(mJLK D:DOC.008Kȑ h}mJ*(mJL"L D:DOC.009Lȑ mJ*(mJLLL D:DOC.010LȑBJ mJ*(mJȱH F`LLi}~L G~L J BH A G`LLHʩ MBH MBLHLLͬLLMLHI L MHLHʢI FIj}H FLMLLLLH)M)MͬLLdMLHI L^MHLHI FIH FLdMLLM`LiM D1H0Hk}HiHiGHiHiHi HiHi HieMeMLMHmeMHieMLM`LM l}fMGG .A FL;NN: %B ELTN NN %B ELpN Ng %Bm} ELN N %B ELN N %B  EH %B  EH %B n}ELO N %B ELOO"Press for Screen, for PrinterO, %B BLaOK:O^ o}A@ gBMMIP MISLrO ELO$ O %B BM`LOOOISLOp}` ELPPRESS FOR CONTINOUS FEEDO %B ELDPPRESS FOR SINGLE SHEETP+ %B BLVPK:PS Aq}@ gBOOIS OICLgP ELP P %B ELP r}P %B BO`LPPPP#GICLQPP ELDQàQ' %B BLVQK:QS s}A gBPPILQ BP`PP ELQ Q %B B`LQ ȢG !F$GGt}$GGLQG$ B`Q8GRRQLR8GQQQ$GQQI LRQGGRGRQLbRQmQ$GQGQu}L6xo~{>>888>|||f<}c6>8pp8?}w><~~~<||`x`~<~~<}0~0 ~ <~~<~~f~``~~f~~~``~~~f~~f~`~~~~f~~``~~ff8888<>>``f||f88<<w}wk~~fff~~ff~~~f~``~~f~~~```~`~~~~fff~~ff~<ckwf~<~fff~~~~~0~<~~<}~x|ngTTTTTT~f~``~~f~~~```~`~~~~fff~~ff~<ckwf~<~fff~~~~~0~<~~< COMPUTERHOUSE UK presents: M Y D O S 4 . 5 0 These are the files for MYDOS 4.50: MYDOS.DCM} - The Diskcommed disk containing the new bootable DOS, along with the RAMdisk utilities } and source code. MAIN.DOC - The main documentation for MYDOS 4.50. Use your DOS to c}opy this file to your printer. It is formatted for 80 columns. TECH.DOC - The technical notes for } MYDOS 4.50. Same instructions for printout as in MAIN.DOC VTOCFIX.COM - The MYDOS disk fix}er. See the .DOC file below for instructions. VTOCFIX.DOC - The documentation for } the VTOCFIX.COM program. Same instructions for printout. ATR232.AUT - The RS232 driver fo}r ATR-8000 users. ATR232HD.AUT - The RS232 driver for ATR-8000 users using the ATR hard} disk interface. ATARI850.AUT - The RS232 drive for the Atari 850 interface. }READ.ME - the file you are reading now. Computerhouse UK 28/11/88} Computerhouse UK 28/11/889