Re: Disk ][ controller PROM

[David Wilson <mcs6502@gmail.com>]

On Feb 25, 9:55 am, Steven Hirsch <snhir...@gmail.com> wrote:
> David Wilson 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.
>
> Thanks, David.  That's exactly what I needed!

Here is a posting from 2004 where someone was looking for 20 pin 256x8
PROMs and lists more equivalents than I did.

http://www.electronicspoint.com/wtb-256x8-20-pin-bipolar-prom-equivalents-listed-t12502.html
...
N82S135
MMI 6309-1
MMI 63S281
TI 18S22
TI 28L22
MB 7118
AM27S23
74S471
74LS471
uPB421
...