Re: 70's Midway board problem

How can you have a bit 12 when it's an 8-bit machine?

The most common problem on those old Midway games were where the two
boards plugged together. The motherboard had the processor, RAM, &
EPROM, but the daughterboard had the data shifter array. If you get
poor connections to those shifter you will have characters that break up
as they move across the screen.

Matt Rossiter wrote:
>
> Hi there. You can tell when I'm having a party coming up when I ask all
> kinds of 'fixit' questions so I hope nobody minds.
>
> I'm working on a Midway Double Play (1977) that has an intermittant ram
> problem. Using the Fluke 9010a troubleshooter - I'm finding a problem
> at bit 12. This is probably a really basic question, but how do I
> determine which chips correspond with bit 12?
>
> There are 16 2107B chips on the board.
>
> Bit0 - Bit0
> Bit1 - Bit1
> Bit2 - Bit2
> Bit3 - Bit3
> Bit4 - Bit4
> Bit5 - Bit5
> Bit6 - Bit6
> Bit7 - Bit7
>
> Thanks.
>
> Matt
>
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Received on Wed Apr 24 00:38:44 2002