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F0Ξ05: [ BDEHI%} VY8 B V  @  /DE `E:D8:DUP.SYSERROR-SAVING USER MEMORY ON DISKTYPE Y TO &}STILL RUN DOS B;DE J  (` 9 V⪍ ઍ  -'}LLu ÝDEHILV 9 .l 9 .l  `` s$B BH(}I|DE V BLV nB,DE JLV B V BLVDEIʩ BꭝLu } 3E:}DISK OPERATING SYSTEM II VERSION COPYRIGHT 1984 ATARI CORP.A. DISK DIRECTORY I. FORMAT DISKB. RUN CARTRIDG*}E J. DUPLICATE DISKC. COPY FILE K. BINARY SAVED. DELETE FILE(S) L. BINARY LOADE. RENAME FILE M. RUN AT ADDRES+}SF. LOCK FILE N. CREATE MEM.SAVG. UNLOCK FILE O. DUPLICATE FILEH. WRITE DOS FILES P. FORMAT SINGLEL !N',}#"&))9(&*)/h)''-&؆莟R'S  vL/ˢ L }Insert DOS 2.0s, type Y Λx -}DEfHI 1莏#q! @ y0ɛ8A0,' ȅ 1 1ild! 1L!NO SUCH ITEMSELECT.} ITEM OR FOR MENU! 0 .z:*{}.|{ 1 0 0JB 18L%|DL/}%DIRECTORY--SEARCH SPEC,LIST FILE?[# 0 0 &|D3" 1L!NOT A DISK FILEN !B 1L!E# 1 !BD0}ED:}:1BJ|DE 1DEBHI 1 h0ߢ 0.1}  0?詛 1 y0YЛ 1 ;#L" ;#L! 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G}JB|,#P#DE 1 HI BDEHHII 1 B 1 ,^ 1 70,0La- B V,#PH},^ 1 70 0L#L!-* 1P* 1 y0Yj383}mm ݭI}}`8}``|* ? ɛ,`|:-)| / 1L!`DESTINATION CANT BE DOJ}S.SYS0 0H{ 24Δ 28/L!/) 2 Π 2 0 ξK}hAΞB,0 J 1 BDEHI,HÝDE 1HIHIDELSAVE-GIVE L}FILE,START,END(,INIT,RUN)O S0 1`BDEPHI V` S0H 1 L!M}0 0 1L~0`PLEASE TYPE 1 LETTER,0`hhL! 70 1L0L<1 ,;ɛ7,"ɛ:ݦ1ݥN}A"D|ݤD|ȩ:|ȩ|ɛ,,(/+.ީ1 1,ɛ`轤{NAMEO} TOO LONG B VL!` L1I H1EΝDL1|mDiE` V0`8d/8 i:222 1 LP}!ERROR- 144ɛ+,' 20*.. өr2 1``2TOO MANY DIGITSINVALID HEXAQ}DECIMAL PARAMETER800 0 8 00`,0'D800 H,ɛh`2L1NEED D1 THRU D8uR} ECIMAL PARAMETER800 0 8 00`,0'D800 H,ɛh`2L1NEED D1 THRU D8u7K8P?@     Y`  Y0 l `7L 䙣ލT}Ȏ!"` !"H h`lDD   TRATS:D"NUR 䙣ލg ʹ Ġͷ› The two programs on this disk havebeen in the Public Domain for V}sometime now. The one is Amodem 4.3 (nowrenamed Amodem 4.4) and Amodem 7.If you are a a 850 Interface or P:R:Connection W}owner you will probably befamiliar with the two programs. Ifyou are a Datatari Interface ownerthen you may never have hearX}d ofeither as they will not work withthis device, until now that is.If you do not own any of the inter-faces mentioned tY}hen included on thisdisk is a text file describing howyou can build your own interface forabout twelve pounds! This interfZ}aceworks exactly the same as the Datat-ari and should be treated as such. 850 AND P:R: OWNERS --------------[}-----The main disadvantage with these twoexcellent peripherals is that they doNOT support split baud rates such as1200/7\}5; or so the experts say!Both the Amodems, thanks to a chapnamed Geoff McHugh, now allow theuse of the popular baud rate ]}of 1200/75!Simply boot your computer as normalfor your particular interface thenLOAD and RUN the Amodem of yourchoice. ^}Following on from that selectthe desired baud rate, with Amodem4.4 you will have to step through theoptions 4 to 5 times t_}o reach 1200/75.How is it possible to use split baudrates with the 850 or P:R: when theexperts say it is not possible? T`}heanswer is quite elegant. There is atext file on this disk written byGeoff McHugh himself explaining theoperation in deta}ail. DATATARI INTERFACE OWNERS -------------------------This type of interface needs to haveit's own Handler b}loaded into thecomputers memory before it can beused. Until now this meant that youcould only use Commercial programswhicc}h incorporated this Handler.On this disk is a file called RS232.COM which is a Public Domain Handlerthat will allow the Dd}atatari toemulate the 850 Interface. In factany command that is normally usedwith the 850 or P:R: can be used withthis Hae}ndler once it has been LOADed.To use the Handler simply RENAMERS232.COM to AUTORUN.SYS and it willload automatically whenf} the computeris booted with the disk containingthe program. From this point you mayrun any of the Amodems (or any BasicCog}mmunication program) on your comp-uter.*NOTE* There already exists a filecalled AUTORUN.SYS on this disk whichwas createh}d using DOS 2.5's SETUP.COM, this should be DELETED prior torenaming RS232.COM.This also allows you write your ownprograi}ms in Basic to use with theDatatari Interface. It would be niceto see a decent Viewdata programmade available to the Atarij} (noticemy use of the word decent). NO INTERFACE OWNERS -------------------If you are new to communicationk}s andnot a owner of a RS232 type interfaceat all then help is at hand. For avery small amount of money, you cannow build l}a interface that will workvery similar to the to the Datatari.I am compelled to point out that thisdevice is not a rip-ofm}f of the Data-atari which is patented but is acompletely independent design. Infact the designer, Phillip Whiteside,has nn}ever seen the Datatari version!Having built the Interface it may betreated exactly the same as the Data-atari. For it's uo}se please read theinstructions for using the Datatari. FURTHER READING ---------------For more informp}ation on the programs,hardware and methods may I refer youto my Bulletin Board, the Ark, whichis the meeting place of someq} veryclever people in the Atari 8-Bitworld.There you will find:GEOFF McHUGH, the chap who discoveredhow to split baud r}rates on the 850.Dr. MARTIN HOLLAND, who has taken theMcHugh technique a step further toallow split baud rates with Machis}neCode programs on the P:R: Connection.PHILLIP WHITESIDE, who designed thecost effective interface....and many more peot}ple who haveworked hard developing new ideas tokeep the Atari 8-Bit alive.The Ark is available on 021-353-5486working onu} 300 and 1200/75 baud andis available 24 hours a day.We, the users of the Ark, would liketo meet you. Jamv}es Bastable 1988 -------------------.We, the users of the Ark, would liketo meet you. Jam5  L"    P Q R S `S `Q T Q S `S `R T R S `S `T!!!!!`!`!!!!`! x}`!!!΍!`!`"# " "L" " &   R`Rߝ" %`" ##+##|$L$  y}`*  T! Ȍ `  T%` M : ` `  ?&  J#  *   `!  #Ly# z}! #` # #`!#$`x `!X`  ҩ X`  # - ` 2%`!' # t! ҭ {} ҭ L# T%` S !Lq$)@ )J)\   T%ӭӭ)ӭ) 2%))JJ   |}   *` " $% $$ $& $( $ *``H #h`H*) & & *) +)J$ h` H }}*)@ *)0   h`H ``  T! 2%h` ҍҭ ҍ`  w% % % %)Ӡ `  ~} % % Ӣ`xҩs2%}&` & t & ͍&` 0`      ` })Dž` '       `) |$ ~  }  0` `  0&ɛ ~ } } ) |` `HH Ҭ ~&&)  &     &  hhh@HH! t! L& hh }h@ )h@ LEo=.F nVV&"     &  hhh@HH! t! L& hh >U;"P"TADDBASTC12BUFXRWMODEBLCSUCCCSRFLAZERFILETRIOBUFFTERMSAVWOCOFILLFLMENTRAINABLO$}CTRERRTRCAACSEOAROBLBYTBYTEDKEPLBAUSPLIC1@BT@A(BffA(V44@$}A( @ @ @ 7V8VUUU@WAP@$}B2y@GVAB@@ @!!@"@#@$@$%@&@$}'@(B)@*B%D+@,-./0@12@3@4@,,MODS BY J$}AMES BASTABLE, NITRAM & GEOFF++MODIFIED FOR 1200/75 BY G.McHUGH 19886-@ B 6-$%6-?:C:,<$}<@<<,(G-A'@G6-%F:%,%F:%%,%F:%%,%F:%%@,-EE6-%F:%%@,%F:%%@,%$}F:%%@,%F:%%@,2   $O A B0(C($ΠŠ٠ŠO6-@,,($}$ԠԬ¬ìĬͬЬҬӬԬթ,,($ԠԠΠ( 06.>:,""6.(6.$}( Š(((( (̠Š6-?:C:,<$}:,,$"A#B C 6--$}A' $ 0Af9( BADC A#L 6-V ! 6-%6-%!( O.K. "*"A( # ")$}6-@# A) A+%,$!6- A(+6-@ / 56-AAf A# ((*** SAVING FILE $}  26-267+$A(,%<+$A(,%,. 6- (& BYTES/" 9-%6.7%<%,-($}56-%9 '  "6-$, A)T +(%(*** UNABLE TO RECEIVE FILE+6-^ *  6- '  6-$}@2 Af  06-6- ( ( *** SENDING  *** @w- /(/(*** SENDING S$}ECTOR %/ ***  *6-  *%6-%% $*AT&$6-%+AT&, D6-$%C:,-A'$})6-F:%,0*8(>:,@6-%D  6-@:>:,,** % )%")F:,"@A94 A4> 6-$}H  6-% A9  6-&!A3 **$($(*** TRANSFER COMPLETE *** A9<$}&(&(*** UNABLE TO SEND FILE ***F *  ( -@I@R6.D1:*.*67<,.>:,, A$}@`@"(, A@P ( A@@  A@e"A@  6-6.$} 6Af0(6(*** UPLOADING  ***-C:,C:,%&= *F:,F:,"@(3(*** ABORTED$} ***= AEP8 6-F:AG,%-,)4(>:,8   - 0 F:AG,)&($}>:,0 AE`&("(*** UPLOAD COMPLETE ***& "@gA"@A "@A0$}"@AE%(%(*** MUST SELECT FIRST! ***F:,@AP@ p/(/($$}q,,($䬠嬠򠱭r,,($嬠䬠u--($䮠¬ìĬ$}ЬҬӬԬթz)6.>:,(|4BA4CAp4DA4UA$}4MA@4RAp4SA+ 4T6-@2&%!@+6-% 4P6-@&$}%A/ 6-!@H* @S%6-/ A@  X- 6-6-(-(*** RECEIVE FILESPEC b4$}ApgQ Ap7<,0:37@<@,0:G(SPECIFY DEVICE!Q Apl 6.7<,0DApv $}Ap@((*** HAVE FILE %%(*** TYPE (Y) TO ERASE  . )(>:,@$6..$} Ap.@6.@3 6-6- B @7 6- ($(*** SEND FILESPEC ($}74AEQ A7<,0:37@<@,0:G(SPECIFY DEVICE!Q AJ# 6-7<,4C:#6-$}A(N& 6- (* LOADING BUFFER &6-O< 6- A6.*@<AA6^* A@*6-?:$}C:,<<@:AS,*** FILE NOT FOUND *** 6-6. $}B (#2#   &# 6-%!@#6-@&2 @&(A$+&@,26-& "@$}(A 6-&("@(1200/75(6-@& ( BAUD ''M6-I:,&A,;,;Ap$},56-C:,;6-A6-M6-@']6-6-@'6-@36-@96-?6-K6-@W6-@]6$}-$''6-@!6-@$'6-A(.' 6-6-6-@8'++;,;@,;A0,;@R,B'!6-A$}6-AP!6-L''6-@6-B2y'6-B@V'@K:`''6-@+@'0' $} @4A@R1:'@6R1:'67,. 67,. '67+$},,($ ӠH+(.%-A6A6"!% .9-AR"#67,.>:,'"$}567%,.>:,9 .AA.%-@R"!67,.>:,% . 2 B06-6  6$}@6R1:6@8R1:6@R1:6@@R1:6Q "B7`AI$}-B7b@F?B7dA'QB7f@6AAf6 B$:HH1,104,104,133,213,104,1$}33,212,162,32,169,7,157,66,3,169,0,157,72,3:>>157,73,3,32,86,228,48,40,160,0,145,212,173,0,6,201,1,208:OO20,177,212,201$},155,208,14,169,13,145,212,230,212,208,2,230,213,169,10,145:>>212,230,212,208,2,230,213,24,144,196,132,195,96,74,68,83:P$}P104,104,133,204,104,133,203,104,133,206,104,133,205,162,32,169,11,157,66,3:DD169,0,157,72,3,157,73,3,160,0,173,0,6,201,1$},208,26,177,203,201:KK13,208,20,160,1,177,203,201,10,208,12,160,0,230,203,208,2,230,204,169:OO155,145,203,160,0,177,203$},32,86,228,230,203,208,2,230,204,165,203,197,205:((208,187,165,204,197,206,208,181,96:88169,13,157,66,3,76,86,228,169,7$},32,189,6,76,86,228:KK168,169,11,32,189,6,152,76,86,228,157,66,3,169,0,157,72,3,157,73,3,96>99104,104,133,213,104,133,2$}12,104,133,215,104,133,214><<162,64,32,163,6,173,235,2,201,0,240,68,162,64,32,171,6>DD172,200,2,192,0,208,16,201,7,208,$}2,169,253,201,8,208,2,169,126>WW201,32,144,20,172,192,2,240,10,162,0,129,212,230,212,208,2,230,213,162,0,32,179,6>HH165$},215,197,213,208,190,165,214,197,212,208,184,169,8,141,194,2,96>DD240,176,173,252,2,201,255,240,41,162,16,32,171,6,172,193$},2,192>AA0,240,5,162,0,32,179,6,172,200,2,192,0,208,12,201,253,208,2>@@169,7,201,126,208,2,169,8,162,64,32,179,6,173,31$},208,201,7>16,199,141,194,2,96> 32,68,218,104,201,4,208,43>!!104,104,10,10,10,10,170,104>104,157,66,3,104,15$}7,69,3?104,157,68,3,104,157,73,3 ? 104,157,72,3,32,86,228,132?!!203,189,72,3,133,212,189,73 ?3,133,213,96*?$}END OF PROGRAM FILE D2:AMODEM.USE104,157,72,3,32,86,228,132?!!203,189,72,3,133,212,189,73 ?3,133,213,96*?$*^^AQ12ATIQMENUQKEQ3CLSMDTRAMTYPBAUQ1QQ19FBFRQ5MLNDSQSRFLASCRPQ1HDRQQQRDCOQ(}PLTROPNLFUNTRXMAIQ3QCFLAADDIOBFFBFLQTERQ1TMPRCVMSMLNWAIDMPBLSCTNASACCAEOSNDEOUPLMLNCLKS(}TCWDGLDLDSBFLA (} (} !"#$%&'()*+,(}-./0123456789:;(}<=>?@ABCDEFGHIJK(}LMNOPQLL͠ by Trent Dudley 5/85. This program is in the public domain(}.??Clock speed adjusted for U.K. use by Geoff McHugh 9/88221200/75 modification by Geoff McHugh 9/88 ;A(}W, B 6- 6-C:, 6-?:C:,:%A,-7&@X<&@D, 7&@<,D N AP&67(},. 倀怀:67,.>:%AD,N67,.>:%AD,U@@"(&D(Dial >:%A,/(}U( Page //K@@&$+(,,( anual dl96-"*3>(K(~~edial (: ON((~FF'(}( ng dis: ON('(~FFA(@&@$+(,2( rans dulex 6A(bad   (eit((Choice ](}" F:,"6-@" Ap F:Ad,"AUAp,3 @P6-3!@d* @d%A1%(}"@C* 6-%% A6%"@E*!6-&% A;3@I* @I%)6-&@H3 A@(}"@v6-(E"@wAJ""@6-("AO"@6-(T"@6-&  (}U;"@**"6-&#")6-- 1 ; A0V'"@**"  ' A0Y!"@*6-&(} ! r8"@('@*(4 A8 w A0|7( "7((}2(堣(]#@23AP A0Y Ap#6-+$%&@t,$Y(You have s(}elected 7&@X<&@D,Y*7&@C<&@3,0 Y(System password is 7&@C<&@3,4(}6.7&<&@,6-(-%46-@:7,,WA"@5)!@9* @F*@C)!@G* @XI6-%W6(}7<,.>:, 67%,.P($(宮. 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BqB$ 6. A4 6.$ B7<)},0DBtPB66.󀹀'"@3667,.B"@567,.B"@667,.)}B"AT67,.B( 67,."@2(67A#,.C 6. @@ Bs0C%6. A)}!4% 5C4E:BtP:C. 6.67,.# A*4. ?C 6.6.6.DCL AY67,.)}!6.+ @@<67B:,%,.B6.L @@NC)67,.󀹀) BsbC/ Bt!4E)}:% / Br`gC. Br.67,.lC- A!*A6#- BtvC7!6-?:C:,<$+)}0E:,< @P@467,.> Bt@C(BrPC#"AT#67,)}. C BtC* 67,.* Bt@C BtDF 6-F:,"Ap)},67,. 26.< @@F Bt@ D3"Ae)67,.3 Bt@D*67,.  )}6.=:,* @@ D  6. *D+!67,.+ Bt@E8@8($Ⱥ)}ͺӠEF@F(1Р 12:00'00 AE*?:C:,,BU5 (* BxE)}$OF=,67AD,.3(:)=$ N** Cheers! Ade ͛!N͛"N͛#N͛$N͛%N͛&N)}͛'N͛(N͛)N͛D2:AMODEM7.GEO  N** Cheers! Ade ͛!N͛"N͛#N͛$N͛%N͛&N(> 'The McHugh Patch' Split Baud Rates With Any Atari RS232 Interface By Geoff McHugh -}Did you know that it ispossible, despite what the'experts' say, to obtain split baudrates on the Ata-}ri 850 (orsimilar- including P:R connection)RS232 interface? No, neither did I,until very recently. It all sta-}rted when I receiveda copy of the source code for theRS232 handler which I use with myDatatari interface. While -} I waslooking through the listing, Itdawned on me that it should bepossible to get the handler too-}perate at split rates (which itwas not originally intended to do)by using a few direct POKEs fromwithin a termi-}nal program. Since atthe time the expert opinion wasthat the 850 interface wastotally incapable of split-} baudrates, I naturally assumed that thiswould only work with the Datatariinterface, so I constructed someprog-}ram PATCHes for two versions of the Amodem terminal program(Amodem4 and Amodem7), labelledthem as being for -} use with theDatatari interface and the RHANDRS232 handler (which I use) anduploaded them to my favourite -} BBS, The ARK. I was naturallycurious as to whether this WOULDwork with the 850 interface, so Iasked-} the sysop to try it out, andthought no more about it, untilI noticed a message from a fellowuser to the sysop cl-}aiming that thepatched program had worked withhis P:R Connection (supposedlymore-or-less identical to the 850-}interface). I was, of course, veryinterested by this, so I again askedthe sysop if he would try again-}with his 850 interface. Imagine mysurprise when I next logged-on tofind that my patch was beinghailed as -}the greatest discoveryin Atari 8-bit communications!Apparently, the patch had worked onthe 850, and the sysop-} (JamesBastable) was quite understandablyexcited. I hardly need to tell youthat I was just as excited as him!The -} repercussions of thisdiscovery should strike far intothe world of Atari 8-bit comms.Anyone James conta-}cted about thisstill said it was impossible,until he proved them wrong. As faras I can tell, even Atari themsel-}vesdo not know about this, otherwisethey surely would have capitalized onit! Maybe now the Atari will benefitfrom a -} widely available ViewDatacompatible terminal program. Now, I think I have waffledon far too long, so I will -}get down to the nitty-gritty of explaining to you how to obtain split baud rateson your humble Atari 850 InterfaceM-}odule! How To Do It Yourself Ok, where should I start?I suppose a very basic explanationof what hap-}pens in your interfacehandler is as good as any. Basically, the handler setsup the baud rates using the-}POKEY hardware timers, which arestored in the Audio Frequencyregisters AUDF1 - AUDF4 (locations$D200, $D202,-} $D204, $D206) What I discovered was that AUDF1 & AUDF2store the timer value whichrepresents the transmitt-}ing baud rate(ie the speed at which your Atarisends data out), and that AUDF3& AUDF4 store the timer valuew-}hich represents the receiving baudrate (ie the speed at which yourAtari reads data in). The timer values are -} storedas two-byte integers (ie have a value of between 0 & 65535) and thevalues corresponding to each baudrate a-}re shown in the table below: ---------------------------- Timer Value Baud Rate 2976 300 -} Baud 19661 45.5 Baud 17891 50 Baud 15727 56.875 Baud 11925 -} 75 Baud 8128 110 Baud 6646 134.5 Baud 5958 150 Baud -} 2976 300 Baud 1484 600 Baud 739 1200 Baud 490 1800 -}Baud 366 2400 Baud 179 4800 Baud 86 9600 Baud --------------}--------------- Table of timer values for specific baud rates ---------------------------- Let'-}s take an example. Sayyou wanted 1200/75 split baudrates to access your favouriteBulletin Board (obviously-} TheARK). So, your transmissionspeed is 75 baud, and yourreceiving speed is 1200 baud.Look a-}t the table above. Thetimer value corresponding to 75baud is 11925, and the timer valuecorresponding to 1200-} baud is 739. First, set your other parameters,parity, translation mode, wordength, etc. When you use the XIO 36-}command (or if you are using m/c thenwhen you call CIO with the cmdno 36)then treat the baud value as 0 (300baud - -} this is simply forconvenience). After you have enteredCONCURRENT I/O mode (XIO 40) then POKE (or equivale-}nt, depending on your programming language)the timer values into the POKEYregisters AUDF1-4. In this e-}xample, the addressesand values to be stored in them areas follows: Memory Location Byte Stored 53760 ($D2-}00) 149 ($95) 53762 ($D202) 46 ($2E) 53764 ($D204) 227 ($E3) 53766 ($D206) 2 ($02)-} The values can be explainedlike this: Tx rate:149+256*49 = 11925 (75 baud) Rx rate:227+256*2 = 739 (1200 baud)-} Well, that's about it! Iwould just like to make it clear thatI have made this important discovery,and it w-}ould be a sad reflection onany Atari owner if he tried to claimotherwise.What the Atari 8-bit needs noware friends.-} It has enough enemiesalready, with Atari seeming to beone of them (I won't complain ifanyone at Atari wants t-}o prove mewrong, but I doubt if anyone will) I would like to thank somepeople for their help andin-}spiration. This may seem trivial,but it means a lot to me to knowthey are there to help if I needthem. F-}irst of all, I would liketo thank James Bastable, and hisBulletin Board, The ARK. If it were not for both Jame-}s and The ARKBBS, I would never have made thisdiscovery, for it was from thissource that I obtained the So-}urcelisting for the RS232 handler. I would also like to thank anARK user who I know only as NITRAM (or Mar-}tin), who convinced Jamesto try the patch out on his 850interface. Last, but certainly not least,I must than-}k Page 6 magazine, whohave REALLY supported the Atari8-bits, when others have onlypretended. If it were not -}for Page 6,I would not even have found TheARK BBS, which has featured soprominently in this breakthrough. -} So remember, even you aretold something is impossible, thechances are that it's not!Geoff McHugh, Co. Armagh-}9th October, 1988n you aretold something is impossible, thechances are that it's not!Geoff McHugh, Co. Armagh,-------------------------------------A Patched Handler for the P:R: Device by M R Holland------1}-----------------------------Having tried out Geoff's elegantsolution for split baud rates inBASIC programmes, I wondered1} if itwould be possible to patch the R:handler which would enable me to usemachine code communictions softwaresuch as Cha1}meleonI use the P:R: Connection which issupposed to emulate the Atari 850.Although the device has its ownhandler which i1}s downloaded when theAtari is booted, I found that certainprogrammes such as Chameleon andRscope would only work if an 8501}look-alike handler was used instead.This was supplied with the P:R:Connection on a disc of utilitiesin a file called PRC.1}SYS. It wasthis handler I was interested inpatching.The manufacturers had thoughtfullysupplied the source code for the1}original handler, and reading throughit I discovered that the baud ratewas set up every time concurrent modewas accessed. 1} Furthermore, the samevalues for the baud rate were pokedinto both send and receive baud ratelocations.Perhaps, I wonder1}ed, PRC.SYS mightwork the same way? I printed outthis file and was able to locate verymany areas of similarity between th1}etwo handlers, including the sectionwhere the baud rates were set up.When a baud rate is to be selected,a code is passed1} to the handler. Thiscode is an index into to the baud rattable. For instance, 10 will point tothe values (low and high by1}te) which,when poked into the POKEY registersAUDF1-4, will set up the desired baudrate. Geoff's article 'The McHughPatch1} Explained' in the Comms sectiongoes into this in full detail.I wanted to patch the handler sothat when 1200 baud was sel1}ected,the handler set up 1200/75. Thepatch, therefore, was quite simple.Whenever the baud rate table indexwas 10, AUDF1 1}and 2 should be set togive a baud rate of 75, and not tothe same values as AUDF3 and 4.Unfortunately, there was not enough1}room to replace existing code withthe patch, so I stuck it on the endas a subroutine.In fact, there are two subroutines1}at the end. I had found a referenceto MEMLO at the beginning of thehandler and had increased it toprotect the new subrout1}ine. Thenew handler seemed to work for M/Cprogrammes, but not for BASIC ones.I had forgotten all about LOMEM.Once more in1}to the breach.... anda JSR to a subroutine to increaseLOMEM did the trick.The patched handler now works withthose machin1}e programmes that I havetried and with BASIC programmes suchas the AMODEM series, although it istoo large to work with AMO1}DEM7B. Ithink that AMODEM7B is better suitedto an expanded Atari as the 64Kversion cannot spare much extramemory for a bu1}ffer. Anyway, thisis only a minor disadvantage becausethe programme can be modified usingthe McHugh patch.The patched ha1}ndler is now availableon this disk as P1275.SYS. If youwish to use Chameleon, you will needto create an AUTORUN.SYS file 1}(usingDOS Copy and Copy with Append) whichcontains:- RS232.SYS + P1275.SYS + CHAMELEONin that order. RS232.SYS is also1}available on this disk.There are two people I would like tothank, because without their effortsnone of the above would ha1}ve come topass.First, I would like to say thank youto Geoff McHugh. He has found a mostelegant solution to the problem 1}ofusing split baud rates on the Atari.My adaptation of the handler is onlyan extension of his original work.Secondly, to1} James and the Ark.I havehad a great deal of fun talking toother Atari users, exchanging ideasand solving problems. Withou1}t theArk, that would not have beenpossible. Thank you, James.Please let me know of any problems.I have been told that P11}275.SYS wontwork with an Atari 850, which is apity. Perhaps some-one will dissectthat handler and write a machine coderou1}tine to patch it.th an Atari 850, which is apity. Perhaps some-one will dissectthat handler and write a machine coderou0 THE PHILLIP INTERFACE ----------------------- After much cursing here is anattempt to put5} the circuit diagram forthe interface in something like legibleform. The interface is hereby releasedinto the public domai5}n - and is not tobe manufactured for profit!! +5 Volts O 10 uF ! 5} 22 uF + ! + Gnd ]__! !_!____! !___ ! ! ! ! ! ! 3K ohm ! 16 5} !____mvmv_[ Z + ______!_______ ! 3K ohm _____! !__!____mvmv_[ X22 ! 1 ! ! 2uF --5}- ! ! --- ! ! 22 uF !____! ! + 3 ! !___! !___[ Gnd + 5}_____! ! 6 ! ! ! 4 ! !22 --- ! !_______> TD 232uF --- ! ! 14 !5}____! ! 5 ! !_______>RTS 232 A>_____! ! 7 11 ! !Gnd]_____! 5} ! 10 ! !_______< RD 232 ! ! 13 B<_____! ! 12 ! 5} !-----< CTS 232 ! ! 8 (optional)CTS<-----! !TTL 9 ! !optional ! 5} ! !_____________! ! 15 ! ! --- - 5} Gnd KEY :- Z is DTR if you need it X is DSRS if you need it (If you don't and yo5}u shouldn'tthen just connect the 22 uF capacitorfrom pin 16 to pin 2) mvmv = resistor ! Gnd = ground (0 Volts) 25}2 uF / 10uF are electolytic capacitors rated 25Volts - Note which way round they go!! A and B are connected to the 55}volt 2 pole Dil relay as below. This time note carefully that therelay has a diode across the coil toprotect your co5}mputer (The diode is internal so you don'tneed to worry about that!) BUT it means that the relay willonly work on5}e way round (As I foundout!) __________ ! U ! ! ! 5} A <_____! !_____< B ! ! __! !___< Motor ! ! C5}ommand ! ! ! ! __! !___[ Gnd ! ! 5} TD >_____! !_____> RD TTL ! ! TTL !_________! The 'U' at the to5}p indicates wherethe indentation on the relay is - Itwill only work this way round!- Don'tworry about which side you conne6}ct thepower to the coil as long as 'MotorCommand' is connected to the second pinfrom the top 'U' on either side. As faras6} the swithches themselves areconcerned you'll have to make sure thatthe tracks of the Vero Board are notrunning from one s6}witch to the other! Where the numbers 232 appear on thecircuit this is the end to fix to yourmodem. Where the letters 6}TTL appear thisis the end to attach to the computer. How? - Well unless someone knowswhere to get the Atari plugs from6} theway I did it was to use the lead off myold data-recorder. If you adopt thismethod then you will need to move theRED w6}ire in the plug from pin 11 (whichis the Audio input) to pin 10 (which is+ 5 Volts) The interface and relay canboth be ea6}sily powered from this supply(I use an 800 XL and have no problems)The whole project will easily fit on asmall vero board.6} The colours in MY data-recorder are(I also give the pin number so CHECKYOURS!) Pin 3 Data Input - White P6}in 4 Ground (0 Volts) - Black Pin 5 Data Output - Brown Pin 8 Motor Command - Orange Pin 11 Audio Input - R6 }ed (Thisneeds moving to pin 10, +5 Volts). Now just to confuse everyone!!It has been pointed out to me that6 } thereare two diagrams of pin-outs for the I/Oport!! So... Here is the pin-out systemI have used.. Looking at either 6 }the socket or theserial plug with the wires coming outtowards you.. _________________ 6 } / \ / o o o o o o \ / 2 4 6 8 10 12 \ / 6 } \ / o o o o o o o \ / 1 3 5 7 9 11 13 \ /______________________________\ 6} For those of you who areusing, in my opinion, the betterdiagramn from Page 6 Issue 32 then yourpin numbers g6}o like this.. 1 2 3 4 5 6 7 8 9 10 11 12 13 In th6}is case then the audioinput lead appears at pin 12 and needsmoving to pin 5. In either case theposition of the wire is the6} same!! -just different numbers!! List of parts (All available fromMaplin) QTY DESC CODE PRICE 6}1 MAX 232 FD92A 6:50 1 Dil 2P 5V relay FX90X 3:65 1 Dil Sckt 14 pin BL18U 0:11 1 Dil Sckt6} 16 pin BL19V 0:11 1 Vero 10346 FL08J 1:20 4 Axial 22uF25V FB30H each0:10 1 Axial 10uF25V FB26}2Y 0:09 If you need the resistors they are.. 1 3K0 Mini Res M3K0 each0:03 I also suggest a length 6}of colour-codedribbon cable (30 cm / 12") 30cm ClrCd IDC Cable 16W XR80B 0:40 Total cost? 12:52 - t6}here'sone in the eye for hardware suppliers! -If any one can find a supplier for theAtari plugs please leave a message. 6} D @(}9 +@'0@9AR@#(@(:}@( (@ the ark bbs-(@2$$(@COMMUNICATIONS DISK7(@< (@ :}number one.F00((ӺƠȬРŠP11()ΠĠĠӠŮZ-@:}AP c%D:MENUD:STARTРŠP11()ΠĠĠӠŮZ-@8(BFLAAFILECNB@* + 5@(}50@>}26-2;@,;@,;@B,6 (}6((ŠˠӠˠ>}#11()ŠˠӠӠ( 6.ΠAR@2"6.<-@@>}(F%-@%( PRINTER IS K/-@@/(P"@@("6.Z>}(<0>--TERMINATE.(d(<1>--INTRODUCTION.(n##(<2>--RS232 SPLIT BAUD RATESx ( By Geoff McHugh. ($$(> }<3>--PRC.SYS 1200/75 HANDLER"( By Martin Holland."($$(<4>--BUILD A RS232 INTERFACE%"( By Phillip W>!}hiteside.%(&#(<5>--AMODEM4B INSTRUCTIONS.&((<6>--PRINTER TOGGLE.@((( Ԡ>"}Π @0AR@!@@0 @A/"@*">#}%6-@/ @0/"@*"@%6-/ @0!"@!6. D:INTRO.TXT "@ 6>$}. D:SPLITGEO"@6.D:PRCNIT"@6.D:INTPHI "@ 6. D:AMOD.TXT" A%>%}B:, @$ @@(}+@+@@+@!6-+ A>&}@(6-%@'"@ A'6-&@N"@!6-.( Ӡξ;@>'}D(N A@ A@:$(ĠƠŮӠξ1@7(}:$X 3 $L@1>(}@@D:*.*4(I( ˠL( AP@( AD2:MENU>)}@@D:*.*4(I( ˠL( AP@( AD2:MENU<8<<  B JKIHiDiELV`L8 8 BLV`LxB+}8t8l Lu8hihiHHȱȱL8c !#3`Lu8JJJJ`H 8h`HB,}ȩh Q8L8 Z8L8 8L8 8L8 8L8S:@9E:E9H '9 H9I9 8 '9h)0ICB-}9D9L8 L :::: :Lr:::IEL[::i:iIIL[:`:i::iB/}::L:`L{:w:w: C`L:L: D8:MEM.SAV: 8| 9 '9`L:L: D:DUP.SYS:̩ 8B0} x:ɀL: '9`88 |9Y:X: '9L); D8:DUP.SYS; 8::88 9 '98? :`;WL`; 9B1}Ln; ` :Y;Y;L;L;)} Setting Up ATARI 130XE Ram Disk; 9L; ; -9  B2} L;D8:; :9 :Y;L}h willallow Amodem to work with the data-tari interface.Now switch on the computer. The diskwill boot and load in the apF?}propiatefile into memory. If you have a 850interface you will here a bleep asthe handler is loaded. After a fewseconds yoF@}u will see the "READY"prompt appear.Now type in RUN "D1:AMODEM4B" orwhatever the Amodem program is calledon your particuFA}lar disk.The program will load and run. Thescreen will now turn black and thetitle page will appear. This screenwill staFB}y until all the data is load-ed.Once the data is loaded you will seea reminder of how to call up theoptions menu and a pFC}rompt will tellyou that the program is in ASCIImode.At this point you may simply call upthe Ark BBS (or whatever) and yoFD}uwill be logged on at 300 Baud. 300baud roughly means that you willreceive characters at a rate of 30 asecond. Do not woFE}rry yourself aboutother settings such as "8-Bit Noparity 1 Stop Bit", Amodem automat-cally sets itself to these.Before yFF}ou do call any BulletinBoard let's have a look at the menuoptions. To do this press