Uses CRE401 arrays for inputs.
Pinout, from left to right (pins 1 to 13):
- Digit 1 ABCD
- Digit 2 ABCD
See also MV-ELA for the marquee board details.
Connection to the MVS board visible in [on page 5 of the schematics]
These boards can be tested in the system ROM's hardware test menu. The third screen shows "LED1" and "LED2" values which should change each second. The value shown should be the value displayed on the boards.