30 Apr
2012
30 Apr
'12
3 p.m.
On Mon, 30 Apr 2012 16:18:24 -0400, "Bill Sudbrink" <wh.sudbrink at
verizon.net> wrote:
Eric Smith wrote:
To totally confuse the situation, the TMS2716 in not compatible with the Intel 2716
whereas the TMS2516 is, The TMS2732 is industry standard whereas the TMS2532 is not. This
goes back to the time when the industry was sorting out what was going to be standard -
one should be extremely careful when choosing, changing, or programming PROMs of this
vintage.
I just went through a learning process with a piece of failed HP test gear where a PROM
failed. The unit had 2716 equivalents. I borrowed a friend's unit and attempted to
read his PROMs and failed. An individual on the HP equipment list attempted to do the same
and also failed until he looked at the schematics for his unit and found yet another pin
out for what appeared to be a 2716 equivalent. The PROMs in question are NEC2316 about
which information is unobtainium.
-> CRC
Bill Sudbrink wrote:
Interesting. Thanks for the correction.
Data sheet claims pin compatibility with 2732.
No, the TMS2532 doesn't make any such claim. It claims that it is "pin compatible with
existing ROMs and
EPROMs (8K, 16K, 32K and 64K)", but that does not include the
2732, and their reference to 32K and 64K was only in regard to
ROMs.
So, the 2532 predates the 2732? Interesting that they revised
the data sheet until 1982 without clearing that up.
The TMS2532 is most definitely *not* pin
compatible with 2732
I see that now. I must remember that data sheets are at least
partially products of the marketing departments. Sigh...
Bill S.