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Crazy Complex Reset Circuit

October 18, 2015

Before I wire the prototype on the protoboard I wanted to get the CTS reset working so that the host PC could reset the Z80. Some programs(teraterm) hold RTS low all the time so I needed to make it momentary. I put a cap/pullup combination in to do that and then another diode to /RST. This works fine except that I routinely use MODE COMx RTS=ON to reset the Z80 from dos which seems to do several pulses. Anyway, the circuit is pretty crufty looking:
18-10-18 protoproto
15-10-18 schematic

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  1. A Better Reset Circuit | olduino

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