6 Games Programs - Revision history

Enigma at 20:12, 1 May 2026

2026-05-01T20:12:15Z

Enigma at 20:09, 1 May 2026

2026-05-01T20:09:48Z

Enigma at 19:50, 1 May 2026

2026-05-01T19:50:49Z

Enigma at 19:22, 1 May 2026

2026-05-01T19:22:24Z

Enigma: Created page with "Category:C64 Game Compilation ==== Content ==== ===== Side 0 ===== * Single Disk Backup V1.0 by Michael Schaff, 27 Jul 1982 * Scooper Froot [https://www.lemon64...."

2026-05-01T19:21:54Z

Created page with "Category:C64 Game Compilation ==== Content ==== ===== Side 0 ===== * Single Disk Backup V1.0 by Michael Schaff, 27 Jul 1982 * Scooper Froot [https://www.lemon64...."

New page

[[Category:C64 Game Compilation]]

==== Content ====
===== Side 0 =====
* [[Single Disk Backup]] V1.0 by Michael Schaff, 27 Jul 1982
* [[Scooper Froot]] [https://www.lemon64.com/game/sooper-froot lemon64 link]
* [[Stellar Wars]] [https://www.mobygames.com/game/92960/stellar-wars/ mobygames link]
* [[Depth Charge]] [https://www.mobygames.com/game/69748/depth-charge/ mobygames link]
* [[Labyrinth]] (color version) [https://www.mobygames.com/game/50163/labyrinth/ mobygames link]
* [[The Quest]] [https://www.mobygames.com/game/84690/the-quest/ mobygames link]
* [[Patience]] [https://www.mobygames.com/game/72041/patience/ mobygames link]

===== Side 1 =====
Side 1 is empty.

== Source 1 == 
{| class="wikitable"
|-
! Property !! Data
|-
| Title || 6 Games Programs
|-
| Publisher and/or Developer || Commodore UK Ltd.
|-
| Year || 1983?
|-
| Disk(s) || 1
|-
| Number of Index Holes || ?
|-
| Media Type || 5.25 DSDD
|-
| Retail, Budget or Compilation (with name) || Compilation
|-
| Country of Release || UK
|-
| Language(s) || English
|-
| Platform || C64
|-
| NTSC or PAL || PAL
|-
| Protection || Checks for error on track 1 sector 5
|-
| Working? || Yes
|-
| Archived || 14 Mar 2026 enigma/parser, provided by @rndt@F64
|-
| Verified by || enigma
|}
<gallery>
File:Commodore_6GamesPrograms_arndt_a_dos_r1.png|Side 0
</gallery>
===== Streams =====
[[File:Streams_Commodore_6GamesPrograms_arndt.zip]]
===== G64 =====
[[File:Commodore_6GamesPrograms_arndt_s0.g64]]

Disk side 1 is empty.

== Additional Information == 
From internet:
<gallery>
File:Commodore_6GamesPrograms_disk_front.jpg|Disk Front
</gallery>

@@ Line 68: / Line 68: @@
 The initial loader loads to $9E80 and then decrypts with
 a2 00    ldx #$00
-a0 08    ldy #$08
+a0 08    ldy #$08    // 8 bits
 bd 80 9e lda $9e80,x
 c 8d 3f 02 sta $023f
-f 0e 3f 02 asl $023f
+f 0e 3f 02 asl $023f  // shift highest bit to carry
-6a       ror a
+6a       ror a      // shift it in byte from top, effectively mirroring the bits
 88       dey
 d0 f9    bne $022f

@@ Line 147: / Line 147: @@
   .C:9f11  90 03       BCC $9F16
   .C:9f13  6C FC FF    JMP ($FFFC) // RESET
-  .C:9f16  86 2D       STX $2D
+  .C:9f16  86 2D       STX $2D // VARTAB vector
   .C:9f18  84 2E       STY $2E
-  .C:9f1a  A5 2B       LDA $2B
+  .C:9f1a  A5 2B       LDA $2B // Pushes TXTTAB vector
   .C:9f1c  48          PHA
   .C:9f1d  A5 2C       LDA $2C
   .C:9f1f  48          PHA
   .C:9f20  A0 00       LDY #$00
-  .C:9f22  A2 08       LDX #$08
+  .C:9f22  A2 08       LDX #$08    // for 8 bits
-  .C:9f24  B1 2B       LDA ($2B),Y
+  .C:9f24  B1 2B       LDA ($2B),Y // Load from Basic Program Text
-  .C:9f26  0A          ASL A
+  .C:9f26  0A          ASL A       // shift left bit to carry
-  .C:9f27  6E 79 9F    ROR $9F79
+  .C:9f27  6E 79 9F    ROR $9F79   // rotate it right into 9F79 (mirrors bits in byte)
   .C:9f2a  CA          DEX
   .C:9f2b  D0 F9       BNE $9F26
   .C:9f2d  AD 79 9F    LDA $9F79
-  .C:9f30  91 2B       STA ($2B),Y
+  .C:9f30  91 2B       STA ($2B),Y // write it back
   .C:9f32  E6 2B       INC $2B
   .C:9f34  D0 02       BNE $9F38
@@ Line 170: / Line 170: @@
   .C:9f3e  A5 2B       LDA $2B
   .C:9f40  C5 2D       CMP $2D
-  .C:9f42  D0 DE       BNE $9F22
+  .C:9f42  D0 DE       BNE $9F22 // loop until VARTAB is reached
-  .C:9f44  68          PLA
+  .C:9f44  68          PLA       // restore TXTAB
   .C:9f45  85 2C       STA $2C
   .C:9f47  68          PLA
   .C:9f48  85 2B       STA $2B
   .C:9f4a  20 33 A5    JSR $A533 // 	Re-link BASIC program
-  .C:9f4d  A2 15       LDX #$15
+  .C:9f4d  A2 15       LDX #$15    // who knows why 21 bytes starting from 9F6A are read here
   .C:9f4f  BD 6A 9F    LDA $9F6A,X
   .C:9f55  CA          DEX
   .C:9f56  10 F7       BPL $9F4F
-  .C:9f58  A9 4C       LDA #$4C
+  .C:9f58  A9 4C       LDA #$4C // write in buffer for CHRGET routine: 4C AD 02
   .C:9f5a  85 73       STA $73
   .C:9f5c  A9 AD       LDA #$AD
@@ Line 188: / Line 188: @@
   .C:9f64  20 8E A6    JSR $A68E // Set program pointer to BASIC-start
   .C:9f67  4C AE A7    JMP $A7AE // Interpreter loop, set up next statement for execution
-  .C:9f6a  A5 3A       LDA $3A
+  .C:9f6a  A5 3A       LDA $3A   // These are the bytes loaded in the loop up there for unknown reason
   .C:9f6c  C9 FF       CMP #$FF
   .C:9f6e  F0 F4       BEQ $9F64

← Older revision		Revision as of 19:50, 1 May 2026
Line 65:		Line 65:
	File:Commodore_6GamesPrograms_disk_front.jpg\|Disk Front		File:Commodore_6GamesPrograms_disk_front.jpg\|Disk Front
	</gallery>		</gallery>
		+
		+	The initial loader loads to $9E80 and then decrypts with
		+	0225 a2 00 ldx #$00
		+	0227 a0 08 ldy #$08
		+	0229 bd 80 9e lda $9e80,x
		+	022c 8d 3f 02 sta $023f
		+	022f 0e 3f 02 asl $023f
		+	0232 6a ror a
		+	0233 88 dey
		+	0234 d0 f9 bne $022f
		+	0236 9d 80 9e sta $9e80,x
		+	0239 e8 inx
		+	023a d0 eb bne $0227
		+	023c 4c 80 9e jmp $9e80
		+	The routine is the same for all games.
		+
		+	The decrypted routine that loads the game looks like this:
		+	.C:9e80 20 CC FF JSR $FFCC // CLRCHN
		+	.C:9e83 A9 0F LDA #$0F
		+	.C:9e85 A2 08 LDX #$08
		+	.C:9e87 A0 0F LDY #$0F
		+	.C:9e89 20 BA FF JSR $FFBA // SETLFS
		+	.C:9e8c A9 02 LDA #$02
		+	.C:9e8e A2 DD LDX #$DD
		+	.C:9e90 A0 9E LDY #$9E
		+	.C:9e92 20 BD FF JSR $FFBD // SETNAM
		+	.C:9e95 20 C0 FF JSR $FFC0 // OPEN
		+	.C:9e98 A9 02 LDA #$02
		+	.C:9e9a A2 08 LDX #$08
		+	.C:9e9c A0 02 LDY #$02
		+	.C:9e9e 20 BA FF JSR $FFBA // SETLFS
		+	.C:9ea1 A9 01 LDA #$01
		+	.C:9ea3 A2 DF LDX #$DF
		+	.C:9ea5 A0 9E LDY #$9E
		+	.C:9ea7 20 BD FF JSR $FFBD // SETNAM
		+	.C:9eaa 20 C0 FF JSR $FFC0 // OPEN
		+	.C:9ead A2 0F LDX #$0F
		+	.C:9eaf 20 C9 FF JSR $FFC9 // CHKOUT
		+	.C:9eb2 A0 00 LDY #$00
		+	.C:9eb4 B9 D1 9E LDA $9ED1,Y
		+	.C:9eb7 F0 06 BEQ $9EBF
		+	.C:9eb9 20 D2 FF JSR $FFD2 // CHROUT
		+	.C:9ebc C8 INY
		+	.C:9ebd D0 F5 BNE $9EB4
		+	.C:9ebf 20 CC FF JSR $FFCC // CLRCHN
		+	.C:9ec2 A2 0F LDX #$0F
		+	.C:9ec4 20 C6 FF JSR $FFC6 // CHKIN
		+	.C:9ec7 20 CF FF JSR $FFCF // CHRIN
		+	.C:9eca C9 32 CMP #$32
		+	.C:9ecc F0 12 BEQ $9EE0
		+	.C:9ece 6C FC FF JMP ($FFFC) // RESET
		+	.C:9ed1 55 31 EOR $31,X // This is sent to disk drive
		+	.C:9ed3 3A NOOP
		+	.C:9ed4 32 JAM
		+	.C:9ed5 20 30 20 JSR $2030
		+	.C:9ed8 31 20 AND ($20),Y
		+	.C:9eda 35 0D AND $0D,X
		+	.C:9edc 00 BRK
		+	.C:9edd 49 30 EOR #$30
		+	.C:9edf 23 20 RLA ($20,X)
		+	.C:9ee1 CC FF A9 CPY $A9FF
		+	.C:9ee4 0F 20 C3 SLO $C320
		+	.C:9ee7 FF A9 02 ISB $02A9,X
		+	.C:9eea 20 C3 FF JSR $FFC3 // CLOSE
		+	.C:9eed A2 01 LDX #$01
		+	.C:9eef A0 08 LDY #$08
		+	.C:9ef1 18 CLC
		+	.C:9ef2 20 9C FF JSR $FF9C // MEMBOT
		+	.C:9ef5 A9 01 LDA #$01
		+	.C:9ef7 A2 08 LDX #$08
		+	.C:9ef9 A0 00 LDY #$00
		+	.C:9efb 20 BA FF JSR $FFBA // SETLFS
		+	.C:9efe AD 86 9F LDA $9F86
		+	.C:9f01 A2 87 LDX #$87
		+	.C:9f03 A0 9F LDY #$9F
		+	.C:9f05 20 BD FF JSR $FFBD // SETNAM
		+	.C:9f08 A9 00 LDA #$00
		+	.C:9f0a A2 01 LDX #$01
		+	.C:9f0c A0 08 LDY #$08
		+	.C:9f0e 20 D5 FF JSR $FFD5 // LOAD
		+	.C:9f11 90 03 BCC $9F16
		+	.C:9f13 6C FC FF JMP ($FFFC) // RESET
		+	.C:9f16 86 2D STX $2D
		+	.C:9f18 84 2E STY $2E
		+	.C:9f1a A5 2B LDA $2B
		+	.C:9f1c 48 PHA
		+	.C:9f1d A5 2C LDA $2C
		+	.C:9f1f 48 PHA
		+	.C:9f20 A0 00 LDY #$00
		+	.C:9f22 A2 08 LDX #$08
		+	.C:9f24 B1 2B LDA ($2B),Y
		+	.C:9f26 0A ASL A
		+	.C:9f27 6E 79 9F ROR $9F79
		+	.C:9f2a CA DEX
		+	.C:9f2b D0 F9 BNE $9F26
		+	.C:9f2d AD 79 9F LDA $9F79
		+	.C:9f30 91 2B STA ($2B),Y
		+	.C:9f32 E6 2B INC $2B
		+	.C:9f34 D0 02 BNE $9F38
		+	.C:9f36 E6 2C INC $2C
		+	.C:9f38 A5 2C LDA $2C
		+	.C:9f3a C5 2E CMP $2E
		+	.C:9f3c D0 E4 BNE $9F22
		+	.C:9f3e A5 2B LDA $2B
		+	.C:9f40 C5 2D CMP $2D
		+	.C:9f42 D0 DE BNE $9F22
		+	.C:9f44 68 PLA
		+	.C:9f45 85 2C STA $2C
		+	.C:9f47 68 PLA
		+	.C:9f48 85 2B STA $2B
		+	.C:9f4a 20 33 A5 JSR $A533 // Re-link BASIC program
		+	.C:9f4d A2 15 LDX #$15
		+	.C:9f4f BD 6A 9F LDA $9F6A,X
		+	.C:9f55 CA DEX
		+	.C:9f56 10 F7 BPL $9F4F
		+	.C:9f58 A9 4C LDA #$4C
		+	.C:9f5a 85 73 STA $73
		+	.C:9f5c A9 AD LDA #$AD
		+	.C:9f5e 85 74 STA $74
		+	.C:9f60 A9 02 LDA #$02
		+	.C:9f62 85 75 STA $75
		+	.C:9f64 20 8E A6 JSR $A68E // Set program pointer to BASIC-start
		+	.C:9f67 4C AE A7 JMP $A7AE // Interpreter loop, set up next statement for execution
		+	.C:9f6a A5 3A LDA $3A
		+	.C:9f6c C9 FF CMP #$FF
		+	.C:9f6e F0 F4 BEQ $9F64
		+	.C:9f70 E6 7A INC $7A
		+	.C:9f72 D0 02 BNE $9F76
		+	.C:9f74 E6 7B INC $7B
		+	.C:9f76 4C 79 00 JMP $0079
		+	.C:9f79 00 BRK
		+	.C:9f7a 00 BRK
		+	.C:9f7b 00 BRK
		+	.C:9f7c 00 BRK
		+	.C:9f7d 00 BRK
		+	.C:9f7e 00 BRK
		+	.C:9f7f 00 BRK
		+	.C:9f80 00 BRK
		+	.C:9f81 00 BRK
		+	.C:9f82 00 BRK
		+	.C:9f83 00 BRK
		+	.C:9f84 00 BRK
		+	.C:9f85 00 BRK
		+	.C:9f86 0D 53 4F ORA $4F53 // File Name with suffix 2
		+	.C:9f89 4F 50 45 SRE $4550
		+	.C:9f8c 52 JAM
		+	.C:9f8d 20 46 52 JSR $5246
		+	.C:9f90 4F 4F 54 SRE $544F
		+	.C:9f93 32 JAM

@@ Line 9: / Line 9: @@
 * [[Depth Charge]] [https://www.mobygames.com/game/69748/depth-charge/ mobygames link]
 * [[Labyrinth]] (color version) [https://www.mobygames.com/game/50163/labyrinth/ mobygames link]
-* [[The Quest]] [https://www.mobygames.com/game/84690/the-quest/ mobygames link]
+* [[The Quest (Commodore)]] [https://www.mobygames.com/game/84690/the-quest/ mobygames link]
 * [[Patience]] [https://www.mobygames.com/game/72041/patience/ mobygames link]