VECTORLIST - The Mailing List For The Technical Discussion of Vector-Based Arcade Games

June_1999
RE: 137179 replacements (again)


From: Clay Cowgill ( )
Date: Tue Jun 08 1999 - 10:33:07 CDT


The AVG needs RAM for a 16x4 hardware stack. That's why I can't get it to
fit in a decent sized CPLD. There's essentially 64 macrocells for RAM, and
by the time you get to a 128 macrocell device to fit the rest of the logic
in there (a bunch of counters that form the program counter and stack
pointer) the single-chip solution is costing more than the sum of the TTL
(by a long shot). :-/

-Clay

> ----------
> I'm just curious, why do you need memory on the pcb? I have a schematic
> for
> a replacement board (I think from Tempest or something) that shows only
> TTL
> on it.
>
>


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