An EPROM Adapter Board for the HP 3456A Digital Voltmeter
Over time, the mask ROMs in the early HP 3456A Digital Voltmeter's MC6800 Outguard CPU Board can sometimes drop bits causing erratic operation or failure. Both HP NOS mask ROMs and their more generic programmable versions can be hard to find and hacking modern replacements to fit seemed too heavy handed.
The shunt selects the lower image if a 27C512 device is used. Leave the shunt off if a 27C256 device is used or if the image in the upper half of the 27C512 device is desired.
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