If it's only got 18 pins (per the subject line) then I don't think it can be a 27S29. Based on the label my guess would have been a PAL/GAL of some kind, but I can't immediately think of any standard parts that would have had less than 20 pins there either...
p. On Mon, Jun 01, 2020 at 02:55:03PM -0700, Ian Finder via cctalk wrote: > Thanks Bob- this is alongside the 27S29 parts- which are labeled as such, > but this question is about a part labeled AM000076 (different than the > 27S29 which are clearly labeled). > Are you saying they're identical? > > On Mon, Jun 1, 2020 at 11:34 AM Bob Smith <[email protected]> wrote: > > > 27S29 > > > > Abstract: AM27S28 Am27S28/27S29 > > Text: Am27S28/ 27S29 4,096-Bit (5 1 2 x 8 ) Bipolar PROM Am27S28/ > > 27S29 DISTINCTIVE CHARACTERISTICS · · · High Speed Highly reliable, > > ultra-fast programming Platinum-Silicide fuses High programming yield > > · · · Low-current PNP inputs High-current open-collector and > > three-state outputs Fast chip select GENERAL DESCRIPTION The > > Am27S28/29 (512-words by 8-bits) is a Schottky TTL Programmable > > Read-Only Memory (PROM). This device is available in both open > > collector (Am27S28) and three-state (Am27S29) output > > > > On Sun, May 31, 2020 at 7:35 PM Ian Finder via cctalk > > <[email protected]> wrote: > > > > > > Title says all, > > > > > > Backing up all the programmable parts in the Apollo DN100 and the CPU > > board > > > has a few of these ceramic DIPs with the same Apollo P/N labels as the > > > Am27S29 and similar programmable parts. > > > > > > > > > Thanks > >
