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Re: Disk ][ controller PROM
On Feb 24, 11:20 pm, David Wilson <mcs6...@gmail.com> wrote:
> On Feb 25, 2:09 am, Steven Hirsch <snhir...@gmail.com> wrote:
>
> > Does anyone know if the MMI PROM on older Disk ][ controllers has the same
> > pinout as any of the 74S* programmable PROMs? I'd like to read the contents,
> > but would prefer not to let the magic smoke out of my programmer.
>
> According to my Xref databook, the 6309 has the same pinout as
> DM74LS471 and N82S136N and a few others.
Bit of trivia - local (Bulgarian) Disk ][ controllers were made with
2x 4-bit PROM pairs, as sources of 8-bit must've been scarce during
those years (CoCom and friends).