Identifying a Mystery ISA Card

Glen Slick glen.slick at
Thu Oct 15 19:34:58 CDT 2020

On Thu, Oct 15, 2020, 5:24 PM Fred Cisin via cctalk <cctalk at>

> On Thu, 15 Oct 2020, Sean Ellis via cctalk wrote:
> > I got this (currently exploded) mystery RAM, RTC, and I/O board out of
> > a dead Sanyo luggable the other night, and once I replace the burned
> > up tantalums I'd like to put it in my 5150 so I can get a full 640k of
> > RAM.
> > Question is, does anyone know what this board is? It's a completely
> > anonymous board with not even an FCC ID to go off of. I'm assuming the
> > RAM is at least strapped right; all the banks are full which should be
> > 384k, and the Sanyo was a 256k machine = 640k.
> > Here's a couple pictures; one's an actual picture of the card and the
> > other is a simplified TULARC/TH99-esque vector of what's on the board.
> >
> >
> It resembles, although doesn't match, the AST Six-Pack.
> But the AST Six-pack had a clock circuit.

Isn't the 24-pin DIP part MM58167? shown in the images referenced above a
RTC chip?


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