BUILDING THE BOARD
This board has five connectors and a few other components on it. This sits in between the IBM 1130 and the disk drive, routing signals through the emulator box.
A set of SLT backplane pins are the connector for the cable from the IBM 1130's disk controller logic; normally that cable inserts into the backplane of the disk drive. A cable coming from the board has a SLT card connector end that will plug into the disk drive. Two ribbon cables run to the emulator, a modified version of the RK-05 Emulator. Some wires connect to the 1130 main power and to the Run and Unlocked switches in the disk drive.
A power supply regulator and two transistor interface circuits convert the 48V levels of the two disk drive switches to appropriate TTL logic levels before sending them to the emulator box.
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