Silent Scope RTC data information

 General, Technical Info  Comments Off on Silent Scope RTC data information
Dec 182012
 

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.

 Posted by at 1:39 pm

CPS1 Diagnostics ROM

 General  Comments Off on CPS1 Diagnostics ROM
Dec 152012
 

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”

sf211
Street Fighter 2 B-21

megama14
MegaMan B-21

Thanks to cal2 for allowing me to host these.

 Posted by at 9:13 am

Partial Rainbow Islands schematic

 General  Comments Off on Partial Rainbow Islands schematic
Dec 092012
 

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.

Rainbow Islands Schematics

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

 Posted by at 3:13 pm

Jumping (bootleg) to Rainbow Islands conversion

 General  Comments Off on Jumping (bootleg) to Rainbow Islands conversion
Dec 092012
 

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.

Jumping Conversion.zip

 Posted by at 3:04 pm

Data East ’59’ 68000 CPU Info

 General, Technical Info  Comments Off on Data East ’59’ 68000 CPU Info
Dec 082012
 

Ive been attempting to create a pinout of that 68K. I’m pretty sure what I’ve got so far is accurate although I make no promises as it does get a bit confusing sometimes. If you can shed any light on the pinout of this chip I would be grateful.

—CUSTOM 68K—
pin 7 = A1
pin 8 = A2
pin 9 = A3
pin 10 = A4
pin 11 = A5
pin 12 = A6
pin 13 = A7
pin 14 = A8
pin 15 = A9
pin 16 = A10
pin 17 = A11
pin 18 = A12
pin 19 = A13
pin 20 = A14
pin 21 = A15
pin 22 = A16
pin 23 = A17
pin 24 = A18
pin 25 = A19
pin 26 = A20
pin 28 = A21

pin 27 = VCC
pin 54 = VCC
pin 55 = VCC
pin 56 = VCC
pin 64 = VCC

pin 31 = GND
pin 58 = GND

pin 32 = D7
pin 33 = D6
pin 34 = D5
pin 35 = D4
pin 36 = D3
pin 37 = D2
pin 38 = D1
pin 39 = D0
pin 40 = D15
pin 41 = D14
pin 42 = D13
pin 43 = D12
pin 44 = D11
pin 45 = D10
pin 46 = D9
pin 47 = D8

pin 48 = AS
pin 49 = UDS
pin 50 = LDS
pin 51 = R/W
pin 52 = DTACK

pin 57 = CLK

This post will be updated with any new information if/when I get it.

 Posted by at 12:07 pm