IOE Z80 extension board working 21:01 (2006.09.21:1 tech_notes#279 xxxxx_at_piksel#1)

If brittle. Uses 74LS245 8 Bus-Transceiver for input (but 245 also can be controlled as to direction.) - potential expansion board for FPGA or schmitt triggers using these

74LS374 8 bit D-register for output

+ other logic including 74LS139 2 bit de-multiplexer

TODO: voltage dividers and possible 245s for FPGA extension board