8086-88 Second level board (Board "B")

8088/8086 microprocessor.
EPROM: 2764 (8K x 8), 27128 (16K x 8) or 27256 (32K x 8).
RAM: 6264 (8Kx8) or 62256 (32K x 8).
8 bit programmabile I/O by 8255, 16 Outputs made by two 74HC374 latches, 16 Inputs made by two Tri- State 74HC244 Buffers.
I/O Emulator: to insert in PC, connectable with card B by a probe substituting the microprocessor, this allows PC to "watch" board "B" I/O.
Modular Expansion Bus for connection to the other cards.