Anders NielsenThings are moving along and I managed to program both a W27C512 and a M2732A - the latter requires a 21V programming pulse, so if we can program that, we're probably ready to get a move on with a PCB.
6502 assembly code has enough routines to check ID's, erase EEPROMs (including 14V erase), and program with either 1-255ms programming pulses or 100us.
I'm confident the hardware works, so now it's just a matter of committing traces to a PCB. Spending a lot of time getting the layout right, at the moment.
I have a sponsorship lined up for PCBs and components, so the first 100 or so will be available cheap or really really cheap.
Oh - and I also messed around with undoing my new 21V EPROM programming skills. Have a look if you haven't seen the video.
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Well done. Cool video. BTW UV eraser lamps don't have to be expensive, large and mains powered. Look for "e17 10v uv disinfection lamp" on AliExpress. But you'll need an enclosure and safety switch for it. Maybe an old box with lid and a microswitch will do.
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That looks like an easy weekend project! Thanks for the tip. I wonder if I can find an E17 socket.. And how much current I need to prepare for. I also see some UVC LED's on LCSC but they're either 5$ each or right out of reach of 253.7nm.. The cheaper ones peak at 260nm - I wonder if that'll have any effect.
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E17 appears to be a standard light bulb base size. https://lightadviser.com/light-bulb-base-chart/ According to this, it only requires 3W, so about 300 mA: https://lightexports.com/3w-uv-germicidal-light-bulb-3-watt-gtl3-e17-base/
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