The missing chip is an Am25LS2519 which is an old, and odd, AMD logic IC that's pretty hard to find these days. It also looks like it was hard for the bootleggers to get back-in-the-day as the the other bootleg/clone Pengo's I have both had a plug in board for this chip.
The plug-in appears to be a full implementation of a 25ls2519 in
standard logic. It's even labeled '25LS2519 substitute' and is total overkill, as Pengo
only uses about half the
functionality of the chip.
Anyway.. to get the board working I needed a replacement. The function
of the chip for use on a pengo board fits into just 2 IC's, or even just one
GAL16v8, but that's another story.
The replacement board also works on an original Pengo as a replacement
for IC 'U74'
Schematics, board layout provided at the end of the page, so time to build
one....
|
Only two IC's are needed The schematic was designed to keep the PCB routing simple so it would fit on a single sided board that can be home etched.
|
|
|
 The 25LS2519 substitute board from another Pengo clone |
On to a PCB Single sided board, bottom/solder side size of the board is 1.7" x 1.25" |
Assembled board
|
Assembled board Top view - White dot it PIN 1 |
Project Files
Designed using Cadsoft Eagle 4.16r1
Contents
|
||||||
|
Plugged into IC74 on the board
The board is now working perfectly as you can actually see the graphics. It also works on an original Pengo as a replacement for U74 |
