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.