
I/O Address Map
Hex range
Device
000-01 F
8237A-5 DMA Controller #1
020-03F
8259A Interrupt Controller #1
040-05F
8254-2 Timer
060-06F
8042 Keyboard Controller
070-07F
Real Time Clock NMI (Non-Maskable Interrupt) Mask
080-09F
74LS612 DMA Page Register
0A0-0BF
8259A Interrupt Controller #2
0C0-0DF
8237A-5 DMA Controller #2
0F0
Clear Math Coprocessor Busy
0F1
Reset Math Coprocessor
OF&OFF
Math Coprocessor
378-37F
Parallel Printer Port on Board
3F0-3F7
Floppy Disk Drive Control on Board
3F8-3FF
Serial Port on Board
Note: l/O address, hex 000 to FFF are reserved for the system board
110.
Hex 100 to 3FF are available on the l/O channel.
Specifications A-5
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