https://datasheetspdf.com/pdf-file/541962/AMD/AM27S13/1 Listed as a 50NS part 27S32 is listed at 70NS part.
On Wed, Jul 17, 2019 at 2:59 PM Eric Smith via cctalk <cctalk@classiccmp.org> wrote: > > On Wed, Jul 17, 2019 at 9:43 AM Mark J. Blair via cctalk < > cctalk@classiccmp.org> wrote: > > > > On Jul 17, 2019, at 1:20 AM, Paul Birkel <pbir...@gmail.com> wrote: > > > From some notes (origin misplaced!) you'll need a typical access time of > > > 40ns from address, or 20ns from /CS: > > > > Thank you! That rules out using a 70ns EEPROM, then. > > > > While the bipolar PROMs were faster, I think 70ns will work on an M9312, > though I haven't verified it. The timing for reading the nibbles from the > PROM to assemble into a 16-bit word is controlled by a delay line and > associated logic, and it looks like the required access time is on the > order of 100ns, with a cycle time on the order of 150ns.
