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Originally Posted by SiriusHardware
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Well I have 4 here and 20 in storage... is that enough?
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It depends on how many you have to wade through to arrive at a working setup 
I can only admire Chris who only had to sacrifice one device to get to the point where he was confident of being able to programme further devices without any problems, although I understand he took the precaution of first only programming one bit at a time before progressing to whole nibbles, and so on. |
I seem to recall telling you that was what I was planning too a few of years ago when I first started thinking about it... In a 512x4 PROM you have 2048 test attempts. Even a used PROM has approx 50% zeroes that can be used for testing!