Apart from the MAXIM created PC parallel port I've included a single push switch and a rotary encoder for manual data entry. Throwing the KISS principle to one side, I've extended the PCB design to also include an AVR, RS-232 port, some EEPROM and an RTC (with battery back up). I've packed the 1206 size LEDs into a square matrix (8x8), which will illiminate the tedious wiring and allow for character or graphics mapping experiments. My first thoughts were to create a break-out board with the IC, some headers for comms and power, and a matrix of LEDs. BatchPCB is fabbing this one, I've just placed an order, so I expect to have it back in three weeks. I've created an EVAL PCB in EAGLE if anyone is interested. I'm interested in the Maxim LED display driver ICs (MAX7219/MAX7221), which were discussed here and here recently.
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