This version has been updated to SBC-85 v2 which has universal EPROM sockets and other enhancements.

NOTE: gerber files updated to version 1.1

I have been wanting to go back to my roots and build an 8080 or 8085 single board computer in the same concept as the MIL MOD8.

The 100mm x 100mm SBC-85 CPU is the first of several cards that are in various stages of design, building, or testing. As a shared project and open architecture, expandable system, I invite others to join in and create additional components for this system and share their ideas on the project website.

Designed as a very low cost 8085 based single board computer the board has:

• 8085 CPU
• 8155 providing 256 bytes of RAM, 22 pins of I/O, and an onboard timer
• 6264 8KB onboard RAM
• 4KB 2732A EPROM in socket
• 4KB 2732A EPROM in ZIF socket
• MAX232 for RS232 Serial I/O to a terminal emulator
• Full bus expansion including latched address via a readily available PCB edge connector

Other cards that are available and will be shared include:

• 4 slot backplane
• Bus monitor with 7-segment and binary address & data display, status line display, single step & slow step
• Cassette Tape Interface data storage
• Remex paper tape reader interface
• 8-bit relay output

We are currently working on the website, software, and additional subsystems so this is very much an ongoing project. Please visit SBC-85.COM for more details on the system including documentation.