The SBC196 board was designed to have an EPROM plugged directly into it. Since the SBC196 only has room for one EPROM, the interface board was designed to allow an additional EPROM to be used with a switch to determine which EPROM is active.
The microprocessor accesses the EPROMs directly through a short ribbon cable that connects from the EPROM socket on the SBC196 board to J12 on the interface board.
When diagnosing problems that may be attributed to the control board, it is sometimes advantageous to eliminate EPROM connection issues as a cause. This can be done by swapping the EPROMs to different sockets or by inserting an EPROM directly in the SBC196 board.
When doing this, it is vital that the EPROM be rotated 180 degrees from its position in the interface board.
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