None of the online manuals have this??? www.ipdb.org

Sent

Be careful, because there is many errors on the WPC-S schematic of the CPU board.
I don't remind all of them, but when I create the bench test for this board, I notice many errors.

As far as I remind, the most visible is the resistors network (at top left), on the data bus of J202... a great joke here
• On WPC, the last resistor is shown as short-circuited (to VCC).
• On WPC-S, it is connected to the same !!! but the schematic look different. Bad try !!!
• On WPC-95, ok, this is at least correct. The opposite pin of the resistors network is indeed, connected to the ground.

Another issue that I remind was around the Security PIC. Should be about the data bus, at U24 region.
• On WPC-S, they use a 74LS374. If I well remind, the order of the data bus is inverted (D0 goes to D7, D6 goes to D1, ...).
• On WPC-95, they adopt a better solution , they replace the LS374 by a LS574 that has a more friendly pinout.

There is also an error on the pin number of the ASIC.
• On the WPC-S, the SW ROW and SW DIR are badly numbered (they are inverted). This has been corrected on the WPC-95 schematic.

WOW, I didn't know there were that many errors in the WPC schematics!
I hope someone can find them all and post a corrected schematic.

corrected sw-row and sw-dir pinout of ASIC for WPC/WPC-s :
https://pinside.com/pinball/forum/topic/wpc-89-cpu-board-info#post-3520056

I had a deeper look at it but it seems that WPC and WPC-s are correct and WPC95 is wrong in the manual.
It doesn't make sense either to connect pin 10 to GND as it only consumes power from the 5Volt without any function.

Picture applies for WPC to WPC95 with only difference that RP1 is 4.7K on WPC/WPC-s board and 1K on WPC95.

J202 pullup.jpg