NEW SOFTWARE PATCH FOR WILLIAMS GREEN ROM

All system 6 games -- Blackout, Firepower, Gorgar, Laser Ball, Scorpion, Time Warp, Tri Zone, Algar and Alien Poker -- can be configured for freeplay by setting Adjustment 18 to zero. Unfortunatelty, doing so disables the credit knocker. Since this is not very nice I made a patch to enable the knocker in freeplay. The patch changes the code of Flipper ROM 1 (IC27). (System 6 flipper ROMs are also called Green ROMs.) A 2716 EPROM chip is required for the patched code.

Please PM me (@idealjoker) if you are interested in the patch file. Also, I'll be attending Pinfest in Allentown and I can bring a couple of copies for testing. Alternatively, you can use a HEX editor and apply the patch manually. The listing is below; each line shows the hex offset from the start of the ROM, the original byte value as well as the replacement byte. Please let me know if this does not work in your game or something looks weird.

066D: C6 -> 4D
066E: 08 -> 27
066F: BD -> 21
0670: 7A -> 36
0671: A9 -> B6
0672: 8D -> 60
0673: 4F -> CD
0674: 23 -> BD
0675: 1E -> 71
0676: 16 -> CB
0677: 27 -> B6
0678: 1B -> 60
0679: B6 -> CE
067A: 60 -> 97
067B: CD -> 3A
067C: BD -> 8D
067D: 71 -> 45
067E: CB -> 23
067F: B6 -> 07
0680: 60 -> 96
0681: CE -> 07
0682: 97 -> 8B
0683: 3A -> 01
0684: 96 -> 19
0685: 07 -> 97
0686: 8B -> 07
0687: 01 -> 32
0688: 19 -> 4A
0689: 97 -> 27
068A: 07 -> 09
068B: 5A -> D6
068C: 27 -> 3A
068D: 06 -> 26
068E: 96 -> FC
068F: 3A -> 20
0690: 26 -> DF
0691: FC -> 20
0692: 20 -> 01
