Hello friends.
I´m currently fighting against alkaline corrosion on a WPC95, it is the prototype board.
Does anyone have a correct schematics fot this MPU board ?, I think its the A-20119 schematics.
I can´t find them on the net.
Any help is welcome ( even if you have pictures of a naked PCB )
Thanks in advance and greetings from Spain !
That's the .3 (or -3) version of the manual. U27 is shown as 74LS02. The CPU board is listed as A-21377.
The .1 (or -1) version of the manual shows U27 as 74LS08. The CPU board is listed as A-20119.
Quoted from Powerchisper:... on a WPC95, it is the prototype board.
There's an even earlier version where D28 is not on the board (was added manually in-house by WMS). The service bulletin information @ http://www.planetarypinball.com/mm5/Williams/tech/sb86.html has more information for you.
There is a PDF of the .1 that was posted somewhere on the internet but I don't remember where or if it's still available.
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Sevilla
Frankfort, NY