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Old 14th Feb 2020, 6:56 am   #30
circuitryboy
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Join Date: Jun 2012
Location: Bristol, UK.
Posts: 115
Default Re: A Simple Programmer for TESLA "MH74S-" bipolar PROMs

There's been a long interval here, mainly because I'm out of UK since end of October. Managed to get to an 'Internet Shop' in November. Since then a phone on variable 4G doesn't hack it.
I did quickly tack a version of SoC Promblower together, using my timing code sequences already shown. I appended a 3mS cool-down to the 'zap' pulse.
This successfully programmed 512 quartets of SCIOS in one pass of ~9 seconds. Note I followed SCIOS flowchart, which zaps 0s as well as 1s!
There was an error in code so prog+verify worked but not verify-only.
I would recommend a 4mS pause and bypassing the 0s.
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