SIO Rev-3
The IMSAI SIO 2 is a faithful reproduction of the 1975 SIO USART board.
The SIO is available in a one-port (SIO 2-1) or a two-port (SIO 2-2) configuration.
Each port is a complete synchronous/asynchronous USART (8251A) with TTL, RS-232, and current loop interfaces.
A port expansion kit is available to convert an SIO 2-1 to an SIO 2-2.
When built to the instructions in the new User Manual, the SIO 2 will be electrically and mechanically identical to the 1975 IMSAI SIO 2 Rev-3.
The SIO 2 is licensed for sale by IMSAI from RetroTechReboot.
It is entirely produced and shipped by Parastream Technologies.
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.
- SIO 2-1
- Complete SIO 2-1 Rev-3 kit with printed user manual. A complete reproduction of the original 1975 IMSAI SIO 2-1 Rev-3 kit.
- SIO 2-2
- Complete SIO 2-2 Rev-3 kit with printed user manual. A complete reproduction of the original 1975 IMSAI SIO 2-2 Rev-3 kit.
- SIO BB
- SIO Rev-3 bare board.
You may also add one or more of these options to complete your build.
- SOC-SIO 2-1
- Standard socket set for SIO 2-1.
- SOCM-SIO 2-1
- Machined socket set for SIO 2-1.
- SOC-SIO 2-2
- Standard socket set for SIO 2-2.
- SOCM-SIO 2-2
- Machined socket set for SIO 2-2.
- SIOC
- Serial I/0 clock piggyback board for SIO.
- SOC-SIOC
- Standard socket set for an SIOC.
- SOCM-SIOC
- Machined socket set for an SIOC.
- SIOM
- Expansion port kit to convert an SIO 2-1 to an SIO 2-2.
- SOC-SIOM
- Standard socket set for an expansion port kit.
- SOCM-SIOM
- Machined socket set for an expansion port kit.
You may also add one or more of these accessories and parts.
- CABLE A
- 18" flat table to carry signals from the SIO and MIO boards to the cabinet rear frame.
Project Status
The SIO Rev-3 development is scheduled for Q2 2025.
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