CPS2 PAL3

PAL/GAL images

http://www.jammarcade.net/pal-dumps/

As of 21 Sept 2012 - the G Pal from jamma arcade is not confirmed working, F version works great

PAL3

Deals with addressing the ROMS, 4(5) different versions. Original part is PALCE16V8H-15, 15 is the speed rating, 15ns. Pin compatible GAL is GAL16V8B-15, GAL16V8B-10 is also confirmed working.

On rom board 93646B-4

• Pin 2 via jumpers go to A20 on eprom 13,14,15,16 (GFX low chunk)
• pin 3 go to A19 on eprom 13,14,15,16

• pin 5 via jumpers go to A20 on eprom 17,18,19,20 (GFX high chunk)
• pin 6 go to A19 on eproms 17,18,19,20

• pin 7 via jumpers go to A20 on eprom 11,12 (Qsound samples)
• pin 8 go to A19 on eprom 11,12

Version B

Up to 16mb GFX, 2x2mb qsound sample eproms.

Version D

Unknown

Version E

Existence to be confirmed

Version F

Up to 32mbit GFX, 2x2mb qsound sample eproms

Version G

Up to 32mbit GFX, 2x4mb Qsound sample eproms.

The equations, or logic, of this chip is:

i1=1 i4=4 i9=9 GND=10 /nc11=11 o12=12 o13=13 o14=14 o15=15 o16=16 o17=17 o18=18 o19=19 VCC=20 

o19 = /i1  output pin 19 is the enable line on eprom 14&16
o18 = i1   output pin 18 is the enable line on eprom 13&15
o17 = /i4  output pin 17 is the enable line on eprom 18&20
o16 = i4   output pin 16 is the enable line on eprom 17&19
o15 = i9   output pin 15 is the enable line on eprom 11
o14 = /i9  output pin 14 is the enable line on eprom 12 
/o13 = gnd
/o12 = vcc
o12.oe = vcc

PAL F->G hack

It is possible to trick an F into behaving like a G with a jumper wire. You need to lift pin 7 of PAL3 so it doesn't go into the socket and solder a jumper wire from pin 7 to pin C13 of connector CN3. This works on all revisions.

PAL F->G hack, later model B boards

With 93646B-6 and 93646B-7, you can simply lift pin 7 and solder a jumperwire to pin 9.

PAL version cheat-sheet

• If qsound samples (11&12) is 4mb each, it's a G