16 Dec
2008
16 Dec
'08
12:07 a.m.
Subject: Re: 8008 chips
From: "William Donzelli" <wdonzelli at gmail.com>
Date: Mon, 15 Dec 2008 15:28:41 -0500
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
The 1101 256 byte static ram. Later there would be the 2102 (1kx1) and
2102 256x4 that were important to small computeres.
The 1103 was dynamic and while cheaper it was also hard to work with
due to refresh and interface needs.
Allison
I have a bag of 35 NOS type "MF1103P"
dated 722x, 18-pin plastic DIP, gold-plate
pins, made by Microsystems International Ltd. (a briefly-existent Canadian
chip maker). I believe these were 2nd-sourced 1103's, as MIL also made an
MF8008 and MF1702.
I also have a gold-capped C8008. One idea would be to make a period-style
8008 system with all of it.
If I sell them can I retire to Monte Carlo instead?
You could probably get a nice plane ticket.
There is a "missing link" Intel RAM that many chip guys lust for. I do
not recall the number - 210something.
If I look thru my records I can probably remember, but I have too many
things to do right now.
--
Will
--
6:50 p.m.
The 1103 was dynamic and while cheaper it was also
hard to work with
due to refresh and interface needs.
The thing I rmemeber about the 1103 was that it's PMOS. Not only does it
need strange supply voltage levesl (+16V and +19V), but also all I/O pins
(address, data, etc) work at, IIRC, 16V levels. There were Intel chips to
covnert those to TTL (3207, 3208 I think), but they came out later than
the 1103.
The HP9810 calculator uses '06 + active pull-up (1 transistor) circuits
to level-shift TTL to PMOS levels, and IIRC some kind of fast comparator
to take the data outputs back to TTL.
-tony
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ajp166＠bellatlantic.net -
ard＠p850ug1.demon.co.uk -
wdonzelli＠gmail.com