cramit.txt

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   THERE ARE TWO KNOWN WAYS TO WRITE 
PROTECT A RAMCARD. THIS ONE INVOLVES
USING A SWITCH RIGHT ON THE RAMCARD. TO
DO THIS YOU MUST HAVE A LITTLE KNOW HOW
OF THE RAM CARD OR OWN A SCHEMATIC OF 
YOUR RAM CARD. YOU MUST BE ABLE TO FIND
THE R/W LINE. FIRST

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     HOW TO MODIFY PRO-DOS TO WORK
** WITH ANY ROM & OTHER PRO-DOS INFO **

  FIRST, MAKE A COPY OF THE DISK USING
COPYA FROM THE DOS 3.3 MASTER. THEN
USING ANY 16 SECTOR DISK-ZAP UTILITY
THE FOLLOWING SECTORS ARE CHANGED:

        TRACK 1, SECTOR A: BYTES E8
THROUGH E9 BECOME "EA"
        TRACK 1, SECTOR C: BYTES 5F
THROUGH 71 BECOME "EA"

        THE ROUTINES AT THESE LOCATIONS
WERE LOOKING FOR "SIGNATURE" BYTES
IN THE F8 MONIT

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****************************************
**                                    **
**       A NEW 'DOS' TIP TO ADD       **
**         DISK SPACE TO YOUR         **
**           DOS 3.3  DISKS           **
**                                    **
**        BY: MARC EPSTEIN            **
**                                    **
*****************

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PROGRAM COMPRESSION
"HOW TO" AND A UTILITY PROGRAM
==============================

     WITH IN MANY CRACKED PROGRAMS LURK
MANY WAISTFUL REPETITIONS OF DATA (I.E.
23 04 59 55 55 55 55 55 55 55 55)  THEY
ARE NECCESSARY FOR THE PROGRAM TO WORK
BUT THEY TAKE UP A LOT OF SPACE.  TO
SOLVE THIS "PROBLEM" I HAVE WRITTEN A
PROGRAM TO CRAM TOGETHER OTHER PROGRAMS
AND A PROGRAM TO UNCRAM AND RUN THE
ORIGINAL PROGRAM.  OF COURSE THERE ARE
MANY VERY COMPLICATED WAYS TO "GET THE
MOST OUT OF EVERY BYTE" BUT THE WAY I
CHOSE IS VERY SIMPLE:
 
IF THERE IS A REPETITION IT IS STORED
LIKE THIS:
 
 1) NUMBER OF REPEATS (UP TO $FF),
    REPEAT VALUE
 
OTHERWISE STORE THINGS LIKE THIS:
 
 2) $00, NUMBER OF UNIQUES (UP TO
    $FFFF), LIST OF UNIQES
 
USING THIS METHOD THE ABOVE EXAMPLE
WOULD LOOK LIKE THIS:
 
00 00 03 23 04 59 07 55
 
IN THIS SMALL EXAMPLE NOT MUCH WAS
SAVED BUT IN REAL LIFE HOWEVER I HAVE
BEEN ABLE TO REDUCE THE SIZE BY 4K TO
12K DEPENDING ON THE PROGRAM USING THIS
SIMPLE METHOD!
 
THE FOLLOWING TWO PROGRAMS ARE
RELOCATABLE SO THEY CAN BE RUN ANYWHERE
YOU WISH.  THE FIRST OF THE TWO IS THE
CRAMMER AND THE SECOND PROGRAM IS THE
UNCRAMMER.
 
TO USE THE CRAMMER JUST:
 
  1) LOAD THE PROGRAM TO BE CRAMMED
     ALONG WITH THE CRAMMER (AT LEAST
     ONE PAGE ABOVE THE PROGRAM)

  2) ENTER THE FOLLOWING INTO PAGE 0:
 
     00- PROGRAM START (LSB)
     01- PROGRAM START (MSB)
     02- PROGRAM END (LSB)
     03- PROGRAM END (MSB)
 
  3) RUN CRAMMER
 
  4) GET THE FOLLOWING FROM PAGE 0:
 
     00- CRAMMED START (LSB)
     01- CRAMMED START (MSB)
     02- CRAMMED END (LSB)
     03- CRAMMED END (MSB)
 
BEFORE==>     PPPPPPPPPPPPP        CRAM
              !           !        !  !
DURING==> CCCCCCC         !        CRAM
          !   ! !         !        !  !
AFTER===> !   ! !    CCCCCCC       CRAM
          !   ! !    !    !!       !  !
      $0400   ! !    !    !!       !  !
(PROGRAM START) !    !    !!       !  !
            $????    !    !!       !  !
          (CRAM START)    !!       !  !
              (PROGRAM END)!       !  !
                  (CRAM END)  (CRAMMER)
 
 
TO USE THE UNCRAMMER JUST:
 
  1) LOAD CRAMMED PROGRAM AND UNCRAMMER
     RIGHT ABOVE IT
 
  2) CHANGE THE NOP'S IN UNCRAM TO THE
     FOLLOWING:
 
     NOP- CRAMMED START (LSB)
     NOP- CRAMMED START (MSB)
     NOP- CRAMMED END (LSB)
     NOP- CRAMMED END (MSB)
     NOP- ORIGINAL PROGRAM START (LSB)
     NOP- ORIGINAL PROGRAM START (MSB)
 
  3) CHANGE THE JMP $FF69 IN UNCRAM TO
     THE STARTING ADDRESS OF THE
     ORIGINAL PROGRAM.

  4) PUT A JMP $(UNCRAM ADDRESS) BEFORE
     CRAMMED START AND YOUR DONE
 
BEFORE===>        CCCCCCCC:UNCRAM
                  !      !
AFTER====>  PPPPPPPPPPPPP!
            !     !     !!
(PROGRAM START)   !     !!
       (CRAM START)     !!
            (PROGRAM END)!
                (CRAM END)
 
 
AN EXAMPLE:
 
 CANNONBAL BLITZ-
 
MY BLITZ LOADED AT $0800 TO $8FFF
AND THE STARTING ADDRESS WAS $2900
I THEN LOADED CRAMMER AT $B000 AND
TYPED:
 
  00:00 08 FF 8F
 
  B000G
 
  0 <RETURN> <RETURN>
 
     0000- 77 15 FF 90 (A SAVING OF 3K)
 
THE CRAMMED PROGRAM NOW RESIDES AT
$1577 TO $90FF.  I THEN LOADED UNCRAM
AT $9100 AND TYPED:
 
  911D:77 15 FF 90 00 08
  913B:4C 00 29
  1574:4C 00 91
 
THE NEW BLITZ STARTS AT $1574 AND ENDS
AT $919C
 
 
THE CRAMMER:
 
1000:A0 00 A9 00 85 04 A9 04
1008:85 0
5 B1 02 C8 AA E8 8A
1010:91 02 88 A5 00 85 06 A5
1018:01 85 07 B1 00 A2 00 85
1020:0C A5 06 C5 02 D0 18 A5
1028:07 C5 03 D0 12 8A F0 43
1030:91 04 E6 04 D0 02 E6 05
1038:A5 0C 91 04 18 90 7B A5
1040:0C E6 06 D0 02 E6 07 D1
1048:06 D0 04 E8 D0 D1 CA 85
1050:0C 8A C9 06 90 1D 91 04
1058:E6 04 D0 02 E6 05 A5 0C
1060:91 04 E6 04 D0 02 E6 05
1068:A5 06 85 00 A5 07 85 01
1070:18 90 A0 A9 00 85 0A 85
1078:0B 91 04 E6 04 D0 02 E6
1080:05 A5 04 85 08 A5 05 85
1088:09 E6 04 D0 02 E6 05 E6
1090:04 D0 02 E6 05 B1 00 91
1098:04 E6 0A D0 02 E6 0B A5
10A0:00 C5 02 D0 19 A5 01 C5
10A8:03 D0 13 A5 0B 91 08 E6
10B0:08 D0 02 E6 09 A5 0A 91
10B8:08 18 90 40 90 B3 E6 00
10C0:D0 02 E6 01 E6 04 D0 02
10C8:E6 05 A5 00 85 06 A5 01
10D0:85 07 B1 00 A2 00 E6 06
10D8:D0 02 E6 07 D1 06 D0 04
10E0:E8 D0 F3 CA 85 0C 8A C9
10E8:06 90 AA A5 0B 91 08 E6
10F0:08 D0 02 E6 09 A5 0A 91
10F8:08 18 90 C0 E6 03 A5 02
1100:85 06 A5 03 85 07 B1 04
1108:91 06 C6 06 A5 06 C9 FF
1110:D0 02 C6 07 C6 04 A5 04
1118:C9 FF D0 02 C6 05 A5 04
1120:C9 FF D0 E2 A5 05 C9 03
1128:D0 DC E6 06 D0 02 E6 07
1130:A5 06 85 00 A5 07 85 01
1138:60
 
 
THE UNCRAMMER:
 
2000:20 58 FF BA BD 00 01 85
2008:07 CA BD 00 01 85 06 A2
2010:05 A0 20 B1 06 95 00 88
2018:CA D0 F8 F0 06 EA EA EA
2020:EA EA EA B1 06 95 00 A0
2028:00 E6 02 D0 02 E6 03 A5
2030:00 C5 02 D0 09 A5 01 C5
2038:03 D0 03 4C 69 FF B1 00
2040:E6 00 D0 02 E6 01 09 00
2048:D0 3B B1 00 85 07 E6 00
2050:D0 02 E6 01 B1 00 85 06
2058:E6 00 D0 02 E6 01 B1 00
2060:91 04 E6 00 D0 02 E6 01
2068:E6 04 D0 02 E6 05 C6 06
2070:A5 06 C9 FF D0 02 C6 07
2078:A9 00 C5 07 D0 E0 C5 06
2080:D0 DC 18 90 AA AA B1 00
2088:E6 00 D0 02 E6 01 E8 91
2090:04 E6 04 D0 02 E6 05 CA
2098:D0 F5 18 90 92

 JOHN
 RAYMONDS


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