Re: 70's Midway board problem

Sure, ask us to help fix games for your party and don't invite *us*!
(yah, I know, it's in the mail...)

With the information you provided, I'd have to say - all of them.

This is an 8 bit machine, so when you reference "bit 12" we'll assume you
are talking about
an address line (even though you provided a list of data bit to chip numbers
for some reason).
Address lines are connected to *all* 16 chips; it's not like data lines,
which generally map 1 to 1, or 1 to a few.

Did it happen to mention what was wrong with bit 12?

-Mark

----- Original Message -----
From: Matt Rossiter <rossiter@ni.net>
To: <rasterlist@synthcom.com>
Sent: Tuesday, April 23, 2002 4:11 PM
Subject: RASTER: 70's Midway board problem

> 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 Tue Apr 23 17:05:12 2002