Re: Early EPROM programmer.
Good analysis Owen - I think we'd best now give onewatt a chance to see if he can find any documentation to confirm what you've worked out.
With regard to DIN plug pin numbering, that has always been a little bit odd, it's as though they started off with 3-pin and then every time they added more pins, they retained the numbering and positioning of the already existing pins and inserted the additional ones 'in between'.
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