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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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