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A diode matrix is an extremely low-density form of read-only memory
that was used in computers in the 50s through the 70s, before EEPROMs
were invented. (They are actually still used, but only inside microchips,
not using discrete diodes.) Each bit in the ROM is represented by the
presence or absence of one diode. The ROM is easily user-writable using
a soldering iron and pair of wire cutters.
This particular diode matrix board is a floppy disk boot ROM for a
PDP-11, and consists of 32 16-bit words.
The entire board stores the following code:
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