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This dual one-shot is the heart of my little programmer! Although it would be perfectly feasible to incorporate a ‘delay’ into the software when the EEPROM is actually being programmed, (the programming time for each step varies from actual device type to type.) , I decided to make things easy in my design by using some simple hardware to do the job instead. This crafty little idea here switches in the ‘delay’ via one of the 374 outport lines which slows the processor right down by using the ‘Wait’ line. The /M1 Z80 line then activates the delay at the beginning of each step. |
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