EXP-22
The IMSAI EXP-22 is a faithful reproduction of the 1975 EXP-22 motherboard.
The EXP-22 is licensed for sale by IMSAI from RetroTechReboot. It is entirely produced and shipped by Parastream Technologies.
Complete Kits
Order from the list below. The kits are complete with everything you need except solder and tools.
| Description | Part Number | Availability | Unit Price (USD) |
EXP-22 complete kit with manual, 2 edge connectors and 2 card guides | EXP-22 | 5/31/2025 | $169.00 |
| EXP-22 complete kit with manual, 11 edge connectors and 20 card guides | EXP-22/11 | 5/31/2025 | $349.00 |
| EXP-22 complete kit with manual, 22 edge connectors and 42 card guides | EXP-22/22 | 5/31/2025 | $529.00 |
Options
Bare Board
| Description | Part Number | Availability | Unit Price (USD) |
| EXP-22 bare board | EXP-22-BB | 5/31/2025 | $49.00 |
More Information
Please read this section for additional product information, especially if you are planning to use this board in an existing system,
or use any of your own components.
System Compatibility
This backplane board is compatible with all IMSAI systems and cabinets with a front panel slot.
This includes all currently shipping systems and cabinets, but excludes the PCS 80/15, PCS-80/30, and the VDP series.
The included mounting hardware is not compatible with a “gen-1” cabinet which has a separate mounting plate for the board which screws into the base plate.
If you require gen-1 mounting hardware, please contact customer service.
The board itself is compatible with both mounting systems.
Edge Connector Compatibility
The edge connector through holes were enlarged slightly to receive the EDAC connectors we use in current production.
The 1970s production through holes were 0.040 inch (1.02 mm) diameter to accept the Texas Instruments edge connectors.
The current production through holes are 0.045 inch (1.143 mm) diameter.
This 12% increase allows the current IMSAI connectors as well as legacy connectors.
- NOTE:
-
If you are planning to use your own edge connectors, please make sure that they will fit in the 0.045 inch through holes.
Also check the connector seating height to be sure it is not greater than 0.600 inches (15.24 mm) to avoid clearance issues with an original CP-A (front panel).
Wiring Improvements
The 1970s production boards had solder mask openings where the power supply hookup wires were soldered.
This usually involved a heavy-duty soldering station due to having to heat up a very large surface area.
The current production employs thermal reliefs for the wiring pads, making it possible to solder on the hookup wires with a less powerful soldering station.
The pads themselves are marked with the voltages, making wiring much simples and less prone to errors.
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