This page Last updated Sept 20 2007. Check my S-100 home page links to all my S-100 Web pages.
I have a variety of S-100 cards and related items available. As time permits, I will inventory and price them. You are welcome to ask about specific cards you are looking for. Describe them by manufacturer and model: you will have less luck with me if you ask for a type or function (serial, hard drive, etc), and NO luck if you just request "a list". I have a inventory of many individual cards, too many to list and describe, but generally sorted by brand. Some items I have available are listed or linked below.
For diskette drives, diskettes, controllers and drive manuals, check my
section on disks. For S-100 and related manuals,
go back to my S-100 page and look at my list
of S-100 manufacturers and their documentation. Also check my
S-100 and related books and magazines section for
books and magazines I have on the personal computers of the '70's and '80's.
Ordering information can be found in this notice.
To return to my S-100 home page and links click here.
Check my SD Systems page for Versafloppy II floppy disk controllers.
Here's some of the motherboards I have: measurements are approximate.
Shipping extra. Supplies limited.
SOLD 9 X 17, 20 slots, 3/4" spacing, terminated (Compupro), docs
$ask 9 X 11, 12 slots, 3/4" spacing, terminated (Compupro), docs
$45 9 X 19, 20 slots, 7/8" spacing, no terminators, no power
connector (edge connector or through-holes for power)
$SOLD 7.5" X 10", 3/4" spacing, 10 slots, active terminated & reset circuits (SD Systems)
$49 7.5" X 10", 3/4" spacing, 10 slots, non-terminated (SD Systems)
$49 simple bus extender, a connector at the top of a card full of
lines to the edge connector below. Various manufacturers.
Here's some UNUSED IMSAI switches - originals from C&K, not copies!
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$5 each C&K toggle switches, identical to the ones purchased by IMSAI
$4 w/o for the IMSAI 8080, with RED, not BLUE, plastic levers. These are
red the "address" switches, *NEW UNUSED*. (These will not work as
cap the "control" switches as they do not have a center position.)
The caps can be removed with care and used seperately.
Modest quantity available, minimum order $12. Caps not available
seperately.
Intel and AMD made two compatible models of floating-point processor chips. These chips used a simple protocol to accept data and floating point instructions, to produce a result. They were intended to supplement a microprocessor and accessed as an I/O location. One chip used an IEEE floating point standard, one used another standard. Also, some chips ran from a 1MHz clock, some a 2MHz clock. These chips were available for many years, but always sold commercially above $100 each. In 2007, these chips are likely worth something like $50 each for use. (I don't know if a "chip collector" would pay more, for specific models and physical features, etc.)
The Compupro System Support 1 (SS1) card and a TDL card supported these chips. Pascal MT+ software had an option to use the AMD chip. The Apple Lisa 2 had a socket for the AMD chip. We will update this information if you have some to provide. We have a few of these chips available, but not for cheap. They have been TESTED on a Compupro system. Ask for price and availability.
AMD 9511A - compatible with 8231
AMD 9512 - compatible with 8232
Intel 8231, 8231A - non-IEEE floating point format, supported sine, cosine, tangent, etc.
Intel 8232 - IEEE floating point but no sine, cosine, tan, etc.
AMD and Intel data sheets available, ask for photocopy, specify brand and model
AMD 9511 data sheets, 12 pgs (from copy)
AMD 9511A data sheets, 26 pgs (from copy)
S. Cheng and Rallapalli K (authors). "Am 9512: Single chip floating point processor".
In Conference Record, (IEEE) WESCON, 1980. Paper no. 14/4.
Herb Johnson
Copyright © 2007; Herb Johnson
New Jersey, USA
follow this link to email @ me