Playing with HP2640B

Brent Hilpert bhilpert at
Tue Dec 5 15:20:16 CST 2017

On 2017-Dec-05, at 1:08 PM, Mattis Lind wrote:
> 2017-12-05 20:44 GMT+01:00 Brent Hilpert via cctalk <cctalk at>:
> >On 2017-Dec-05, at 9:14 AM, Mattis Lind via cctalk wrote:
> >> Does the 27S82 have any equivalents that I could look up instead in the
> >> device list?
> >FWIW, 27S82 is listed in the 1982 IC Master as
> >       AM27S82M:   TTL 1024*8 ROM, 275nS access, OC outputs, 24 pin, 5V supply
> >So half the size of a 2716.
> >The book lists PROMs and ROMs separately, so it was probably mask-programmed.
> >(M would be for mil temp going by other AMD numbers.)
> I would think bipolar PROM since rest of the AMD 27S series were bipolar PROMs. I will check this weekend if I can find an old AMD databook.

The ref did specify it as TTL, so yes, bipolar.

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