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J&M Microtek, Inc. JM-31 Development System

The JM-31 single board computer uses the popular 80C31 microcontroller, which has 128 bytes of internal RAM, tow 16-bit timer/counters, and five source interrupt structure. The JM-31 SBC, measuring 4"x5", provides up to 32K ROM (socked 27256 EPROM) and 32K RAM of system memory.

http://www.jm-micro.com/jm31.htm

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