Altair parts substitutions

From: Richard Erlacher <richard_at_idcomm.com>
Date: Wed May 24 20:47:58 2000

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. I do believe you're right about the 2508's.
Needless to say, all this stuff is really difficult to sort out 25 years
hence, since it wasn't too clear what was the case even then.

Dick

----- Original Message -----
From: Eric Smith <eric_at_brouhaha.com>
To: <classiccmp_at_classiccmp.org>
Sent: Wednesday, May 24, 2000 7:01 PM
Subject: Re: Altair parts substitutions


> "Richard Erlacher" <richard_at_idcomm.com> wrote:
> > I didn't realize that Intel made any 2508's.
>
> I don't think they did. That was TI's part number for the 5V 1K*8 EPROM.
>
> Intel's 5V 1K*8 part was the 2758. Other posts have claimed that an Intel
> 2758 is a half-bad 2716, but my fuzzy recollection from that era was that
> the ones I looked at had substantially different die sizes. For half-bad
> parts Intel usually added a suffix to the part number to denote which half
> was bad, and I didn't see such a designation on any of the 2758s I used.
>
> > My sense is that they called their 5-volt parts 8708's.
>
> Nope, that required the same supplies as the 2708, since it was
> really the same part.
>
> > TI was the one famous for the numbering screwup made by assigning an
> > industry-standard number to parts that didn't meed the industry
standard.
>
> Because there *wasn't* an industry standard on the 2K*8 EPROM at the time
> when TI and Intel both announced their parts. I think Intel's move to
> the single 5V supply caught TI completely by surprise.
>
Received on Wed May 24 2000 - 20:47:58 BST