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PROGRAM COMPRESSION
"HOW TO" AND A UTILITY PROGRAM
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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 05 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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