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TECH: 1702a Eprom Voltages
Hi All,
I have in a 1978 model pinball machine, one 1702a. I would like to backup it contents, but my eprom programmer works with 2716 and later. My question is - When I probe the cpu board with a scope, around the eprom, I was expecting to find 5, -5 and -12. I only find +5 and -12. Can I power this device from an external -12 and make a adapter to then read its contents like a 2716. I can then program a 2716 and using a couple of sockets, rewire for the 2716 in place of the 1702a. Any help appreciated. Kind Regards, Garry |
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