The IMSAI MPU-A Rev 4 is a faithful reproduction of the 1975 MPU-A 8080A processor board.
When built to the instructions in the new User Manual, the MPU-A Rev-4 will be electrically and mechanically identical to the 1975 IMSAI MPU-A Rev-4.
Order from the list below. Be advised that individual parts for the kit are not available to bare board customers unless they are explicitly in the options list. Please check the parts list.
| Description | Part Number | Availability | Unit Price (USD) |
MPU-A Rev-4 complete kit with manual  | MPU-A | 4/1/2025 | $199.00 |
| MPU-A Rev-4 bare board | MPU-A-BB | 4/1/2025 | $40.00 |
You may also add one or more of these options to complete your build.
| Description | Part Number | Availability | Unit Price (USD) |
| Socket set for MPU-A, standard | SOC-MPU-A | 4/1/2025 | $7.00 |
| Socket set for MPU-A, machined | SOCM-MPU-A | 4/1/2025 | $25.00 |