Miscelaneous S-100 items for sale

This page was most recent revised date Dec 26 2023. Check my S-100 home page for 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. Please escribe them by brand and model. You will have less luck with me, if you ask for a type or function (serial, hard drive, etc). NO LUCK, if you just request "a list" - I'm not working that way on these S-100 items. Web search on my Web domain will find plenty of S-100 information.

Related items:
Web page on floppy disk items - diskette drives, diskettes, floppy controllers and drive manuals
SD Systems Versafloppy II Web page for those S-100 floppy disk controllers.
my S-100 page home page and my list of S-100 manufacturers by name, with links to their documentation and/or history.
S-100 and related computer books and magazines of the '70's and '80's.
S-100 cabinets and chassis listed among my card racks and chassis Web page.

Ordering information can be found in this notice.
To go to my S-100 home page and links click here.

S-100 cards and related

Ask me for specific brand and model of S-100 cards. Also check my my S-100 brand list, for manuals or other brand references. Of course, look below!

S-100 motherboards

Here's some of the S-100 motherboards I have offered, ask about what's available now.
Measurements are approximate. Shipping extra. I generally test the
motherboard for continuity from end to end and spot-check most pins. Prices generally
depend on brand, condition, number of slots and features on the motherboard (termination).

         Chernow Communications, 20 slots, about 7/8 inch spacing. 
                about 19" X 9", weight 2lbs 10oz. Three boards available.

         California Digital, 18 slots w/termination, 3/4 inch spacing
          two connectors misaligned (soldered in at slight angle). weight 2lbs 5oz, 16.5" X 8.5"

         (1) Wunderbus w/NoiseGuard, 14 slots 3/4 inch spacing
           3 serial ports, other stuff on board
           probably one of the Morrow CP/M system backplanes

         IMSAI EXP-22 22 slots but 13 populated, 3/4 inch spacing

         noname, 17 slots, 13/16 inch spacing.
             17" X 10", weight 2lbs 3oz, 
             with pair of side rails, plastic rails on Aluminum rails, 1.5lbs for pair

         Technical Design Labs motherboards, 4 slots installed, 4 skipped. Some logic on-board
         pulled from IC sockets. Edge connector at one end. A few available, will need repair. 

        6 or 7 slot motherboards, may be cut down, no termination. a few available.

         9   X 11, 12 slots, 3/4" spacing, terminated. IMS brand. 
         IMS top and here's  IMS bottom 

         9   X 11, 12 slots, 3/4" spacing, terminated (Compupro), docs. Some corners cut but board intact.
         Compupro top and here's  Compupro bottom 

         SD Systems, 10 slot, 3/4" spacing, 7.5 X 10 inches, no termination. A few available
         SD System top and here's  SD System bottom

S-100 bus extender cards


$59 and up, for simple bus extenders, a connector at the top of a card full of lines to the edge connector below. Various manufacturers. Other boards with more features may be available at higher prices. Here's a Vector brand S-100 extender card. It's taller than some other S-100 extenders. I have a few of these, unused for $69 each, or for $59 without the S-100 connector.

Here's a Bob Mullen TB-2 extender and logic probe card. There's a simple logic circuit that displays H and L for logic states, and a wire probe. Note the +8V and +16 and -16V power lines can be disconnected. I have copies of the Mullen manual also. A later model included a RESET button for the /RESET S-100 line. These boards are not common so I'll set a price well over $100 for these depending on features, as they are available and requested.

Other extender cards will be priced as available and based on condition and features like height, brand, condition and rarity. PLease don't ask me to show you everything; explain what you are looking for instead.

S-100 bus prototype cards


$49 and up, staring with simple prototype boards with .1-inch centered holes. Various manufacturers, old stock. Other boards with more features may be available at higher prices. Used boards may be at lower prices.

Someone told me in 2023: "I can make my own boards for [a lower price]". That modern price may not include "real gold edge connectors" as used on 20th century S-100 boards. TNIG is flash-gold that will wear quickly and won't resist corrosion.

Here's an Ithaca brand prototype board, unused.I'll offer one of these for $49 plus shipping. The apparent sockets along the edge are NOT sockets; they are connections to the S-100 bus lines. The traces above are for IC's arranged end-to-end horizontally.

Here's some other prototype cards. The top card has no circuit traces at all, but it's drilled out at .1-inch centers. I'll offer that unused for $45. The bottom card is a Vector brand prototype card. I'll offer that unused for $55 plus shipping. I may have some used prototype boards, with some socket and wiring to be removed. Used prices will be lower.

I may have a few other prototype boards, but many are pretty simple boards. PLease don't ask me to show you everything; explain what you are looking for instead.

PC card ejectors

Card ejectors are little plastic bits on corners of cards, that lever against the edge of the card cage,
to "eject" the card. Pay attention to the sizes of boards, placement of holes on corners, etc. for your S-100 card.

2/$1      soft plastic (Zitel?) fold-over. plastic roll pin. used.   THM 5020 1.25" long.
           Thermalloy brand patented, US4261076. pin is likely .093" dia. Long term, these will split apart. 

2/$3      nylon with metal roll pin, Scanbe S-200. about 1.125" long, pin 1/4 X 7/64?
          1/4" wide with 3/8" extended width on "top". Looks equivalent to Bivar CP-06 "natural color" w/RP-250 roll pin

???       unused old stock! nylon Scanbe S-208. 1-1/64" long, roll pin 3/16" long. 
          1/4" wide thruout. Sealed bag of 100, reluctant to open!  Looks similar to Bivar CP-46 "natural color" & RP-250

Spec for S-200 and S-208 Scanbe says "board thickness 1/16 inch" (0.0625) double-sided FR4 PC board thickness
Spec for THM 502X-series suggests board thickness .07 inch. All these see to expect corner holes 1/4" from edge. 

IMSAI front panel switches


Here's some UNUSED IMSAI switches - originals switches from C&K

            *UNUSED OLD STOCK*. identical to the ones sold with the IMSAI 8080
            The actuators are called either levers (paddle thingies) or rockers (AC switch thingies).
            RED, no blue, BLACK levers in stock. BLACK, no red rockers in stock. 
            the switch bodies are C&K 7101 SPST ON/NONE/ON, PC board terminals. 
            These are IMSAI address and data switches and the AC power switch.
            Small quantity available, I will limit orders. Describe your need, not "how many are left?"  

            as described above: $12 for switch with cap, $7 for switch or cap only, plus postage.

            Also available: used, solder loop terminals, C&K 7101, with black rocker. Ask about price. 

            You can ask about other colors, or other C&K switch models (momentary). Be specific 
            including quantity needed. As of mid-2023 new ones aren't available! 

Herb Johnson
New Jersey, USA
here is how to email @ me

Copyright © 2023 Herb Johnson