The board was roughly equivalent to the IMSAI PIO board. However in the case of this board each line could be separately configured as input or output.  The board required 16 I/O ports to be addressed via wire jumpers.   IO was via 1,2 3 or 4 6820 chips. Interrupts could also be triggered using again wire jumpers.  Programming the board was essentially an effort in programming a 6820.
 
The manual for this board can be obtained here.