Altair parts substitutions

From: Dwight Elvey <elvey_at_hal.com>
Date: Thu May 25 11:10:30 2000

Eric Smith <eric_at_brouhaha.com> wrote:
> "Richard Erlacher" <richard_at_idcomm.com> wrote:
> > Eric, I hope I'm not crazy . . . My recollection of the Intel 8748 board,
> > for which series I recall Intel cooked up the 87xx part numbers, had
> > silkscreened on it "It's a 5-Volt world" though they didn't use 5-volt-to
> > whatever they wanted to use for RS232 converters. The memories didn't see
> > any power supply other than +5.
>
> True of things like the 8755, which was introduced at about the same time.
> But the 8708 was from a few years earlier, and was definitely marketed as
> an EPROM for use with the 8080. I don't have any pre-1980 Data Catalogs
> handy, but I'm 99.99% certain that the 8708 was just a different designation
> for the 2708, just as the 8102 is a 2102, and the 8205 is a 3205.

 Some times there were slight differences between family, similar
names. There was a 4702 that had a 1 volt different rating on
the negative rail as compared to the 1702.
 If one looks in many of the older Intel development systems,
they may find what look like 2716's but were labeled 2617 ( as
I recall ). These were 2716's that had a few bits bad that
were used as system ROM's. If the bad bits didn't interfere
with the data needed, they used them.
 Intel did a lot of strange numbering. Not everything they did
was consistent.
Dwight
Received on Thu May 25 2000 - 11:10:30 BST