* If address bit A12 is low, the printer channel is selected for output only. The address must be EFXX.
* If address bit All A11 is low, the Parallel Peripheral Interface (FF1PPI) is selected. Here again, bits A8 and A9 are used to select four sub—channels:
F4XX Port A (I/O)
F7XX Control (Output only)
* If address bit A1Ø A10 is low, an expansion channel is selected. In this case, bits A5 — A7 have special significance:
A5 low selects a communication channel.
The above allocations restrict the user to the following address ranges for any special I/O functions he may require:
F8EØ—F8FEF8E0—F8FE: F9EØ—F9FFF9E0—F9FF: FAEØ—FAFFFAE0—FAFF: FBEØ—FBFFFBE0—FBFF
=== Outer Peripherals ===