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IMSAI Cables

A complete system needs cables to provide interconnects between boards in the system as well as outside the cabinet.

We carry some of the original cables as well as new ones. Order from the list below.

DescriptionPart NumberAvailabilityUnit Price (USD)QuantityOrdering
SIO 2, MIO Internal cable, 26-pin card edge 0.1" to DB25-FCABLE A1/1/2025$40.00
MPU-B Internal cable, 26-pin header to DB25-F.CABLE AF1/1/2025$20.00
PIO 4 Internal cable, 50-pin card edge 0.1" to two DB25-F.CABLE B1/1/2025$60.00
CP-A Rev-4 Data bus cable, 18"CABLE KIn stock$10.00
CP-A Rev-5 Data bus cable, 6"CABLE WIn stock$8.00

For reference, the following table lists all known IMSAI cables and their purpose.

Designation IMSAI Part No Description Comments
CABLE A 91-0400003 18" flat cable to carry signals from the SIO 2 and MIO boards to the cabinet rear frame. Internal cable, 26-pin card edge 0.1" to DB25-F. The SIO 2 and MIO require one CABLE A per port.
CABLE B 91-0400002 14" flat cable connects PIO 4 input or output connector to cabinet rear frame. Internal cable, 50-pin card edge 0.1" to two DB25-F. The PIO 4-4 requires two CABLE B; one for the input ports and one for the output ports.
CABLE C 91-0400004 60" cable to connect floppy disk drives, modems, or terminals (rear frame to rear frame). DB25-M/M. These are common today. Most are round.
CABLE D 91-0400005 60" extension for CABLE C. DB25-F/M. These are common today. Most are round.
CABLE E 91-0400006 28" DB25-F to two 26-pin header sockets with pin 26 key for FDC 2-1.  
CABLE F 91-0400007 6" IFM Board-to-board interconnect cable. Internal cable, 50-pin card edge 0.1" to 50-pin card edge 0.1".  
CABLE H   18" flat cable for Shared Memory Facility. The Shared Memory Facility no longer supported by IMSAI.
CABLE K 91-0400001 18" 16-pin DIP flat cable to connect the 8-bit data bus between a CP-A and MPU-A. Internal cable. Suspected to be named for Joe Killian.
CABLE L   18" coax cable to connect VIO board to cabinet rear frame. Internal cable.  
CABLE M 91-0400017 18" coax cable to connect MIO board cassette port to rear frame. Terminates in a miniature phone jack. Internal cable.  
CABLE P   FPS-U. 40-pin cable to Calcomp drive from FPS-U.  
CABLE Q 91-0400019 18" brown 20GA wire with Molex connector for Calcomp floppy disk cabinet.
CABLE R   5' flat cable which connects 3 ports of PIO-6 board to breadboard system. 50-pin card edge 0.1" to 50-pin header.  
CABLE S   5' flat cable which connects data and address lines of PIO-6 board to breadboard system. 26-pin card edge 0.1" to 26-pin header.  
CABLE T 91-0400021 28" DB25-F to two 26-pin header sockets with pin 26 key for FDC.  
CABLE V 91-0400013 2" Mains pigtail with Molex male pins for Calcomp floppy disk cabinet.  
CABLE W   6" 16-pin DIP flat cable to connect the 8-bit data bus between a CP-A Rev-5 and MPU-A or between a SIO and SIOC. Internal cable. A short CABLE K. Named for Robert E. Weatherford.
CABLE X 91-0400014 9" Mains pigtail with Molex female pins for Calcomp floppy disk cabinet.  
CABLE Z   6' flat cable for Shared Memory Facility. The Shared Memory Facility no longer supported by IMSAI.
CABLE AA 91-0400023 5" PLO cable for FDS.  
CABLE AB 91-0400024 Switch and Molex connector for Calcomp floppy disk cabinet.  
CABLE AC 91-0400025 FDS Chassis. Power cord with three Molex female pins.  
CABLE AD 91-0400026 FDS Chassis. Plug and cord for fan with 3-pin male Molex plug.  
CABLE AE   29" flat cable to connect SIO or MIO serial or parallel ports to cabinet rear frame in VDP-80 line. (VDP-80 version of CABLE A). The VDP line is no longer supported by IMSAI.
CABLE AF   18" flat cable to connect MPU-B serial or parallel port to cabinet rear frame. Internal cable, 26-pin header to DB25-F. CABLE A with a 26-pin header connector instead of a card edge connector.
CABLE AM   36" flat cable to connect DIO to CABLE AN in cabinet rear frame. Internal cable. Configuration unknown.
CABLE AN   60" flat cable to connect the cabinet rear frame to PerSci disk drive. External cable. Configuration unknown.
CABLE AR   28" flat cable to connect PIO 4-4 to cabinet rear frame in VDP·80 line. The VDP line is no longer supported by IMSAI.
CABLE AZ   60" cable to connect the PIO in a VDP-80 to a PCS-80/26. Configuration unknown.

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