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1)
Check BIOS to see if ports are enabled.
2)
Create a little loopback device (subD with pin 2 and pin 3 connected to each other) and use minicom to check if you can see communication.
If hardware handshaking is required by the APC, and you want to simulate it with the loopback device, short the required pins, enable handshake in minicom and check if it works.
With the loopback device, anything you type should show (if local echo is on even twice).
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