IBM RT Series Hardware Reference Manual page 409

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Interrupt level 7 is used on the parallel interface. Interrupts can

be enabled or disabled through the printer control port. The

interrupt is a high-level active signal.

The following table breaks down the functions of the I/O address

decode for the adapter. The I/O address decode is from hex 3BO

through hex 3BF. The bit assignment for each I/O address

I/O Register

6845 Index Register

6845 Data Register

CRT Control Port 1

CRT Status Port

Parallel Data Port

Printer Status Port

Printer Control Port

I/O Address and Bit Map

Monochrome Adapter 7

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