Basic Four board set

This seems to be a 16 bit Basic Four processor set.  It's in unusable condition (most likely), and hopefully will yield up the firmware at least.

The possibility it being a 16 bit superset of the 1600 is due to it having 4 74181 ALU chips.  It was designed just shy of the advent of the 2901, which I believe was the next step in the Basic Four / MAI designs of CPUs.

There are 4 total boards in the scrap set, one with the firmware (Intel mask roms), the board with the 74181's (probably the Data board) one with a lot of logic, and a final one with two large connectors out the back (maybe a path to control panel)?

Will have to see if anyone has more Basic Four information.

Firmware chips.