From caen!batcomputer!ghost.dsi.unimi.it!univ-lyon1.fr!jussieu.fr!math.ohio-state.edu!howland.reston.ans.net!agate!library.ucla.edu!news.mic.ucla.edu!ctc.com!news.pop.psu.edu!news.cac.psu.edu!newsserver.jvnc.net!igor.rutgers.edu!dziuxsolim.rutgers.edu!pilot.njin.net!jac Fri Apr 1 20:38:16 EST 1994 Article: 120 of comp.sources.apple2 Path: caen!batcomputer!ghost.dsi.unimi.it!univ-lyon1.fr!jussieu.fr!math.ohio-state.edu!howland.reston.ans.net!agate!library.ucla.edu!news.mic.ucla.edu!ctc.com!news.pop.psu.edu!news.cac.psu.edu!newsserver.jvnc.net!igor.rutgers.edu!dziuxsolim.rutgers.edu!pilot.njin.net!jac From: jac@pilot.njin.net (Jonathan Chandross) Newsgroups: comp.sources.apple2 Subject: v001SRC092: diskdump -- Split 5.25" Disk Into 6 Files Message-ID: Date: 24 Mar 94 03:53:23 GMT Organization: Rutgers Univ., New Brunswick, N.J. Lines: 204 Approved: jac@pilot.njin.net Submitted-by: David A. Curran (curran@titan.ucs.umass.edu) Posting-number: Volume 1, Source:92 Archive-name: util/diskdump Architecture: ANY_2 Version-number: 1.00 Diskdump takes a DOS 3.3 formatted 5.25 disk and converts it into eight discrete binary files on two disks. The individual files can be uploaded and used with a Unix or Macintosh Apple // emulator, or distributed via a network. The original disk image is reconstituted by concatenating the various parts together. Those of you wishing to learn more about the DOS 3.3 RWTS routine could start with this. A copy of _What's Where In The Apple_ is invaluable to understanding what the various locations do. (I used it when writing the Read.Me.) A copy of _Beneath Apple DOS_ would also be very useful. Enjoy. =Read.Me - -diskdump - -Diskdump takes a DOS 3.3 formatted 5.25 disk and converts it into eight -discrete binary files on two disks. The individual files can be uploaded -and used with a Unix or Macintosh Apple // emulator, or distributed via -a network. The original disk image is reconstituted by concatenating -the various parts together. Note that the files are BINARY: they must be -converted into some ASCII format, either using uuencode(1), binscii(1), -etc., before being emailed. Similarly, any encoded file must be decoded -before the pieces are concatenated together. - -Note that diskdump cannot recreate an Apple // format disk from the various -parts; it is intended to be used in uploading a disk to be used with an Apple -// emulator. - -============== -Using diskdump -============== -Diskdump requires two disks to hold a 140K disk image. The procedure is: - -- format the two destination disks - -- put first six pieces on first destination disk - -- put last two pieces on second destination disk - -Each file is named: - "PART" -where is the current part number. This means the parts are numbered: - PART1 - PART2 - ... - PART8 - -The original disk image is reconstituted by concatenating the pieces together. - -Under Unix this is done as: - cat part1 part2 part3 part4 part5 part6 part7 part8 > diskimage - -Under MS-DOS this is done as: - copy part1+part2+part3+part4+part5+part6+part7+part8 disk.img - -For a Macintosh, you will have to use an editor or file utility to form a -single file from the pieces, and then change the file type and creator to -match whatever emulator you are using. Any decent editor can be used to -concatenate the pieces, and then ResEdit or MacTools can be used to change -the file type and creator. - -============== -Implementation -============== -Diskdump uses the DOS3.3 RWTS (Read-Write Track-Sector) routine to read -the next eighth of the disk. After being read in, each portion is saved -using the Applesoft "bsave" command. - -Each disk segment is stored in RAM beginning at 0x4650 and is 20,480 bytes -long. This means that RAM from 0x4650 to 0x9650 will be overwritten. -Although DOS 3.3 extends down to 0x9600, the region at 0x9600 is used for -file buffers. Since this program uses no files, we can safely use this -region for holding the data we read in. - -Line 1010: - POKE 768,32 - POKE 769,227 - POKE 770,3 - POKE 771,76 - POKE 772,217 - POKE 773,3 -creates an assembly routine at 0x300 that loads the Input/Output Control -Block (IOB) and then calls the specified RWTS subroutine. The A register -gets the high byte and the Y register gets the low byte of the IOB address. -The pokes create the assembly routine: - JMP $03E3 -- loads A and Y registers - JMP $03D9 -- call to RWTS subroutine - -Line 1015: - POKE 800,169 - POKE 802,32 - POKE 803,218 - POKE 804,253 - POKE 805,96 -creates a hex dump routine at 0x320 that is much faster than doing a decimal -to hex conversion in a program. This routine is unused by the program, but -appears because I pulled some of this code out of a sector editor I wrote. -To use it: - POKE 801, - CALL 800 -The hex value will be displayed at the current cursor position. The assembly -routine is: - LDA #$ -- Loads A register with value to display - JMP $FDDA -- Displays value - RTS -- Return to Subroutine (wherever call came from) -where is stored at location 0x321. - -Line 1020 sets up the RWTS for the read operation: - -- Volume number is 0 - -- Data buffer is at 0x9600 - -- Read a full sector at a time - -- Set command code to Read - - Poke Location Meaning - 47083,0 0xB7EB Volume Number - 47088,0 0xB7F0 | Pointer to Read/Write data buffer - 47089,150 0xB7F1 | - 47090,0 0xB7F2 Unused - 47091,0 0xB7F3 Portion of Sector to read - 47092,RW 0xB7F4 Command Code: - 0 = Seek - 1 = Read - 2 = Write - 3 = Format - -Line 20000 sets up: - -- operation code = Read - -- Track = next track number - -- Sector = next sector number - - Poke Location Meaning - 47092,RW 0xB7F4 Operation is Read - 47084,TR 0xB7EC Track Number (0x00-0x22) - 47085,SE 0xB7ED Sector Number (0x0 - 0x0F) - -and then calls the machine language subroutine at 0x300 to read in the data. - -The loop at 7530 to 7555 reads in the data: - -- move the data pointer up by a sector's worth of data - -- read in the next block of data - -- if this was track 35 - -- we have finished the disk - -- if this was sector 16 - -- move to next track - -- sector 0 - -- increment part number - -- save current part using current part number - -- if the part number is 6 - -- prompt user to insert second disk (for remaining two parts) - - -DISKDUMP IS COPYRIGHT 1994 BY DAVID A. CURRAN -ALL RIGHTS RESERVED - -This package may be freely distributed so long as no fee is charged and -modified versions are not distributed. - -David A. Curran -curran@titan.ucs.umass.edu -March 1994 -Version 1.00 =diskdump -10 GOSUB 1000 -20 GOSUB 7000: END -1000 TR = 0:SE = 0:RW = 1:LC = 1 -1010 POKE 768,32: POKE 769,227: POKE 770,3: POKE 771,76: POKE 772,217: POKE 773,3 -1015 POKE 800,169: POKE 802,32: POKE 803,218: POKE 804,253: POKE 805,96 -1020 POKE 47083,0: POKE 47088,0: POKE 47089,150: POKE 47090,0: POKE 47091,0: POKE 47092,RW -1030 RETURN -2000 POKE 47092,RW: POKE 47084,TR: POKE 47085,SE: CALL 768 -2010 RETURN -7000 PRINT "PUT DISK 1 IN DRIVE 2 AND HIT RETURN. ALL INFORMATION ON THIS DISK WILL BE ERASED. 'Q' TO QUIT NOW.": GET A$: IF A$ = "Q" THEN END -7005 PRINT -7010 PRINT CHR$ (4);"INIT DISKDUMP,D2" -7020 PRINT "PUT DISK 2 IN DRIVE 2 AND HIT RETURN. ALL INFORMATION ON THIS DISK WILL BE ERASED. 'Q' TO QUIT NOW.": GET A$: IF A$ = "Q" THEN END -7025 PRINT -7030 PRINT CHR$ (4);"INIT DISKDUMP,D2" -7500 HOME : PRINT "PUT SOURCE IN DRIVE 1, TARGET 1 IN DRIVE2." -7510 GET A$ -7520 SE = 0:TR = 0:CT = 0 -7525 H1 = SE:H2 = TR:RW = 1: POKE 47082,1 -7530 FOR A = 0 TO 79 -7535 POKE 47088,(18000 + (A * 256)) - 256 * ( INT (((18000 + (A * 256)) / 256))) -7540 POKE 47089, INT (((18000 + (A * 256)) / 256)) -7541 GOSUB 2000 -7543 IF ((TR = 35) AND (RW = 1)) THEN GOTO 7600 -7545 SE = SE + 1: IF SE = 16 THEN SE = 0:TR = TR + 1 -7548 VTAB RW + 10: HTAB TR: PRINT "0" -7555 NEXT -7557 IF ZW = 1 THEN RETURN -7560 IF RW = 2 THEN GOTO 7525 -7565 CT = CT + 1: IF CT = 6 THEN PRINT "PLACE DISK 2 IN DRIVE 2.": GET A$: PRINT -7570 N$ = "PART" + CHR$ (48 + CT) -7575 PRINT CHR$ (4);"BSAVE ";N$;",A18000,L20480,D2" -7580 GOTO 7525 -7600 PRINT "FINISHED.": FOR A = 1 TO 2000: NEXT : RUN - + END OF ARCHIVE