XianXi
Member
Is it a security chip or just added logic?
Have a board that has one and everything is reading high.
Have a board that has one and everything is reading high.
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For Konami boards, does the number stamped on the PAL chip mean anything? Like 05596
Thanks for the great info. I'll check the part number and pull the datasheet for it.
They can be used for address decoding, security, and many many more things. They can be used to replace multiple logic gates to reduce chip counts and
Met a board once that had a PAL in a socket on one board, and on another identical board the socket had an LS139 in it. Thought it was seriously overkill!
What game is it?? Sometimes the MAME source has some documentation about the PALs on PCBs...
Gaiapolis (Version JAF)
Program and Data ROM redump
PCB No: PWB353396A
CPUs : 68000, Z80
OSC : 18.432MHz, 32.000MHz
RAM : MN4464 (x3), HM62256 (x9), 6116 (x3)
DIPSW : 4 Position (x1)
PALs : 055996 (sound), 056469A (cpu)