This is an old post, preserved for reference.
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An unusual 2001 has come in for repair. The first things which stands out is the button and display bezel cut into the front panel.
datasheet for the ZN1040E.
TFW8B sells them).
PET diagnostics PCB, which is effectively a breakout board for the microcontroller on board to allow it to drive the PETs address and databus etc. Here I've aligned the 28 pin socket so the display segments are all on one 8 bit port.
The LED modules were, of course, RS branded, 586-526 (discontinued).