GadgetFreak
Active member
I was originally going to put JRok's mod on this board but when I went to his page I found he had only patched the unencrypted version which meant I would have to reprogram most of the roms and replace the Sega cpu. Being a bit of a purist I decided to come up with my own patch.
Besides not having to replace the cpu with my patch, you will also only need to reprogram 2 eproms (IC7 & IC8), the only downside is I do not checksum the high scores so you will need to manually reset the high scores when first powering the board.
You will need to replace the 2K ram at IC19 with a slow NV ram such as DS1220 or M48Z02 that has a 150ns+ access time. I have tried a U63716DC-70 but the board will not run correctly with this faster chip. On all Sega Pengo boards I have seen IC19 is socketed which makes this an easy mod.
To reset the high score table hold down 1 & 2 player start when powering the board up.
As with all my High Score Patches, please post a reply or click thanks if you find this patch works for you.
Pengo: ep1690b.7 or Pengo2: ic7.2 or Pengo4: ep1739.7
Then
Pengo: ep1690c.8
Or
Pengo2: ic8.2 or Pengo4: ep1738.8
Besides not having to replace the cpu with my patch, you will also only need to reprogram 2 eproms (IC7 & IC8), the only downside is I do not checksum the high scores so you will need to manually reset the high scores when first powering the board.
You will need to replace the 2K ram at IC19 with a slow NV ram such as DS1220 or M48Z02 that has a 150ns+ access time. I have tried a U63716DC-70 but the board will not run correctly with this faster chip. On all Sega Pengo boards I have seen IC19 is socketed which makes this an easy mod.
To reset the high score table hold down 1 & 2 player start when powering the board up.
As with all my High Score Patches, please post a reply or click thanks if you find this patch works for you.
Pengo: ep1690b.7 or Pengo2: ic7.2 or Pengo4: ep1739.7
Code:
[b]0050: change the byte 80 to 56[/b]
[b]00F6: change these bytes 80 A8 to AA 2F[/b]Then
Pengo: ep1690c.8
Code:
[b]0028: change these bytes A0 88 A0 88 A0 88 A0 88 to B2 08 B8 CE C0 80 A3 EB[/b]
[b]0030: change these bytes 28 88 28 88 to 68 85 C9 67[/b]
[b]0441: change these bytes 81 F8 8F 82 AC 28 6D E0 85 to 6D 00 88 A2 F8 28 82 24 28[/b]
[b]0F26: change the byte 60 to 61[/b]Or
Pengo2: ic8.2 or Pengo4: ep1738.8
Code:
[b]0028: change these bytes A0 88 A0 88 A0 88 A0 88 to B2 08 B8 CE C0 80 A3 EB[/b]
[b]0030: change these bytes 28 88 28 88 to 68 85 C9 B8[/b]
[b]0441: change these bytes 81 A0 88 82 AC 28 6D E0 85 to 6D 00 88 A2 F8 28 82 24 28[/b]
[b]0F26: change the byte 60 to 61[/b]