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A BA-4 backplane is for use with the PC-1 (power & processor module) in the far left slot and any I/O or communication modules in the other 3 slots.
A BA-40 backplane is similar to the BA-4 backplane except the J5 (PC-1 lower connector) and SL-9 (PC-1 power) connectors have been removed to allow various modules to be installed in the leftmost slot.
A BA-40 can be used with a PS-xx power supply and a CP-xx processor module or can be linked to any other backplane when more slots are required.
There are four (4) connectors at the far right of a BA-4 backplane. The two (2) small 8 way connectors are for inter-backplane communication links, the six way connector is for an external power supply (+5V and +12V DC), and the lower 9 way connector is used for incoming and outgoing power. A BA-40 does not have the lower 9-way SL-9 connector.
INTERNET USERS ALSO CONSULTED ON THE CATEGORY ELECTRIC CONNECTORS
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