Miscelaneous S-100 items for sale

This page Last updated May 17 2012. 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'm not working that way at this time.Some items I have available are listed or linked below.

For diskette drives, diskettes, floppy 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 go to my S-100 home page and links click here.

S-100 cards

Check my SD Systems Versafloppy II Web page for S-100 floppy disk controllers.

S-100 motherboards

Here's some of the motherboards I have: measurements are approximate. I may have others, ask about specific
sizes or layouts, brands, etc. 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)

S-100 bus extender cards

  $49     simple bus extender, a connector at the top of a card full of
          lines to the edge connector below. Various manufacturers.

IMSAI front panel switches

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.

Floating point, math coprocessor chips

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 be accessed as an I/O device, as they took milliseconds to respond. One chip used an IEEE floating point standard, one used another standard. I discuss some of this on the linked Web page.

We have a few of these chips available, but not for cheap. Common prices in 2012 suggest a minimum price of about $50 each; chip collectors will apparently pay twice that for specific chips in specific condition. These 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)

Copyright © 2012; Herb Johnson