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Midwest Can anyone read EA4000 mask programmed ROMS?

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durgadas311

durgadas311

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I'm trying to see if it's possible to recover data on some EA4000 mask programmed ROMs. The have odd voltages, looks like -13V (probably -12 works) and +12V, in addition to the +5V reference for the outputs. Also seen them with -15V/+10V (so maybe need a 25V spread). These are 10-bit wide, although in one case only the low 8 bits were programmed.
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