Andreas has dumped PAL DD1-6 from his Dig Dug pcb.
The PAL was unprotected and will need to be converted to a GAL (unless you have a blank PAL chip handy).
Thanks to Andreas once again
Today I burned a new Timekeeper chip for someones Silent Scope and since I had my board out for testing I thought Id run a few tests of my own.
I know with SS2 there is a checksum in the RTC data. This is not the case with SS1. It just has 13 bytes of data not all of which gets checked.
Here is what I found:
The first 8 bytes must read: 47 51 38 33 30 00 00 00 (GQ830 )
If any of this is different then you will get the 11p error
The next 2 bytes are the year. Mine originally read 20 00
It is actually the year thats shown in game on the title screen etc and can be changed to whatever you want, like this
The last 3 bytes must read: 55 41 41 (UAA). If this is changed to anything else then its 11p error time again.
From what ive tried you can add any data after this and it will make no difference.
The same data is also used across all versions of Silent Scope 1.
I will take a look at the SS2 data sometime too.
cal2 over on the Aussie Arcade forums has made some very useful CPS1 diagnostic software.
“Works only on a CPS-B-21 C board (with no suicide battery). Tested working on street fighter 2.
Tests work ram and vram (shared vram only, gpu vram cannot be tested).”“Replace .23 with this rom”
Thanks to cal2 for allowing me to host these.
Made these a long time ago to help me with a fault. They are far from perfect and it doesnt really cover a lot but it may help someone.
Zabanitu has sent in his own schematic of the sound section from a Cadash board. He also says it applies to a Rainbow Islands board too (with a couple of minor differences).
Thank you very much to Zab for this. Hope it helps someone out one day.
Taito Sound Schematic Download
I’ve finally got around to uploading the files requires to carry out this conversion.
If you don’t know what this is then see the link below
CONVERSION
Pretty much all the graphics ROM’s will need to be replaced so make sure you have a healthy supply of EPROM’s.
