››››    DOS 2.5 Modification for Q-MegXL›  ›  I found the following modification›  in the Madison (WI.) Area Atari›  Users Newsletter (October, 85). ›  Their hardware sig built a 256 XL›  upgrade similiar to the one›  described by Claus Buchholz.  Since›  they didn't have Claus's software at›  the time, they modified DOS 2.5 so›  it would run two 720 sector ram-disk›  drives; one is created by runing›  RAMDISK.COM, the other must be›  formatted (in this version it is›  drive 7, but can be anything between›  2 and 7; see my note below). I tried›  this mod on my 256 XL (Claus›  Buchholz Oct. 85 version) and it›  worked.  I had found that my new›  copy of Typesetter for the XE did›  not work with Claus's software›  (typesetter uses the international›  character set for its own purposes),›  but DOS 2.5-256K did!  In fact I was›  finally able to load the entire›  Typesetter package into the RAMDISK,›  which speeds up operation›  dramatically!›  ›  Richard Evans, East Lansing, MI.›  ›  What follows are the instructions as›  they appeared in the MAAUG›  newsletter.›  ›  Pataching DOS 2.5   by Kurt›  Grittner›  ›  1) Insert your assembler cartridge. ›  Put Dos 2.5 in drive 1 (without›  RAMDISK.COM). Cold start your›  machine.›  ›  2) When the "EDIT" prompt appears,›  get into debug mode by typing:›  "BUG".›  ›  3) When the "DEBUG" prompt appears,›  get into the mini-assembler by›  typing "A".›  ›  4) Type the following lines ending›  each with the RETURN key.  The››››››››››››››  mini-assembler will respond to each›  line with one or more lines of›  assembled object code.  Notice that›  you MUST type a space after each "<"›  sign.›  ›  B86< LDX #0›  105C< LDA #$64›  12DE< LDY $21›  < CPY #8›  < BCC *+4›  < ADC #5›  < TAY›  < LDA $185B,y›  < JMP $1846›  148D< CMP #6›  14C4< LDA #$70›  < JSR $1846›  183A< BYTE. "MEM.SAV ERR",$9B›  1846< STA $44›  < LDA $D301›  < AND #$83›  < ORA $44›  < STA $D301›  < RTS›  185B< .BYTE $20,$24,$28,$2C›  < BYTE. $40,$44,$48,$4C›  < BYTE. $60,$64,$68,$6C,›  77F< CPX #7  (change # for other ›  < BCC $78A   (drive number›  B88< CMP #7  (--2,3,4,5, or 6.›  < BCS $BD3›  105E< CPY #7  (Don't type this!)›  < BCS $1076›  70A< .BYTE $C3›  ›  ›  5) Press RETURN to exit the mini›  assembler.›  ›  6) type "X" followed by RETURN to›  return to the EDIT mode.›  ›  7) Type DOS to access the Dos Menu.›  ›  8) Write DOS files to disk.›  ›  9) Turn off the machine and clod›  start DOS . . with RAMDISK.COM on›  the disk.   When you do a directory›  of D8: you should have DUP.SYS,›  MEM.SAVE and 620 sectors free.  Use›  the "I" command to format D7:.  When››››››››››››››  you do a directory you should have›  707 sectors free.›  ›                                      ›