Re: Seawolf midway 8080

Midway (and later Bally) were real big on using 9316s. No reason you
can't use a 2716, but the output enable and chip select pins may have to
be connected elsewhere (or jumpers reconfigured) to make them access at
the correct addresses. The 9316 could have those lines designated as
any combination at the time of manufacture.

The Space Invaders schematics show how to jumper the board for 2716s. I
snagged that part of the schematic and blew it up. It's enclosed with
the copy of this answer that I emailed directly to Steve.
 

SteveT wrote:

>I've got a midway 8080 main board (seawolf) that comes up (now) with
>vertical bars ...looks and acts like the "H" rom is pulled per the
>Midway faq.
>So I need to verify the chips or make another set.
>Now for the problem/question :
>The manual calls the roms used 3604-6 which come up as 512x8 chips.
>But there are only 4 chips on the board , and there are 4 mame files but
>they are 1k in size.
>Assuming the game requires 4K then the roms on the board can not be 3604
>as stated in the service manual. I found another txt document that
>suggested they are 9316?
>Question 1:...what are they?
>Question 2: since I can't read or write 1k chips , how can the board be
>re-configured for 2k (2716) or does it have to be TMS2716?
>
>Question 3: can the board be configured to pack the 4-1k files into 2
>2716's without altering the board?
>
>I realize that I could drop one address line and use half of a 2716? for
>the 1k code but using 2 chips instead of 4 seems smarter or one 2732.
>
>Anyone have experience on this.
>
>Steve
>
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Received on Sun Jan 4 03:39:06 2004