Altair parts substitutions

From: Dwight Elvey <elvey_at_hal.com>
Date: Wed May 24 11:45:45 2000

"Richard Erlacher" <richard_at_idcomm.com> wrote:
> >
> > By 1977 the 1702 was long gone and nearly history for anything other than
> > hobby and existing production and the 2508/2716 were moving in fast
> > with a 450ns Tacc.
> >
> Yes, but ... the 5-volt parts were costing on the order of $100 per piece.
> I bought a bunch for a project and still remember the "sticker-shock,"
> though it wasn't any better a year later when I had to buy 2732's. In the
> latter case, I sold them for $25 each to a west-coast surplus vendor who
> turned around and sold them for $80 each.
> >

Hi
 I find it interesting that after the 2716's were out for a while,
and the price had dropped to someplace in the $5-$10 range someplace,
the intel 2508's were still in the high $30's. This always
amused me because there was no difference at all between the
Intel 2716 and the 2508 other than the 2508 was a half bad
2716. I call that real good sales to take bad parts and get
more for them. Intel had done this relabel trick because
TI was taking their 2708 sales with their real 2508. When working
at Intel, we used to get may of the dropout parts to use
in our test kludges. We would test the 2508's to see what
was bad in the other half and often, if the bad bits were
not an issue, we would used them in place of 2716's.
 I may be incorrect about the 8205 having the negative input
voltage. I was thinking about the 8212's that do have extended
input voltage. It has been a long time since I was working
with these things and much has gotten foggy.
 I don't remember exactly when 74S138's were first introduced
relative to 8205's. I think that is may just have been an
issue of the 74S138's were not in full production when
Intel was designing things to work with their memories.
By the time products were out, they may have seemed to be
used at about the same time but when designing, you need to be
a little ahead.
Dwight
Received on Wed May 24 2000 - 11:45:45 BST

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