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There is sometimes a need to know if an EPROM or ROM is empty, faulty or erased. Then there is the need to figure out the control signals for a strange type. This circuit was wired up for just that.

It consists of a buffer feeding led's for the data lines and switches feeding 1's or zeroes to the address lines. Switches also select the possible combinations of supply voltage and control lines.

Just in order to extend this to a manually controlled programmer, switches control the levels applied to the data lines. A monostable and a programming supply could be added to make this into a programmer.

This is built on general purpose circuit board with holes in a .1" matrix with square islands. Enamelled wire was used for connections in a point-to-point fashion.

RAMs can also be tested in this circuit, because it has facilities for writing as well as reading, but not DRAMs.

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