64
Note:
The I/O address hex 0000 to 00FF are reserved for the system board
I/O. Hex 0100 to 03FF are available on the I/O channels.
I/O Address Map
I/O AddressFunction
0000-001FDMA Controller 1, 8237A-5
0020-003FInterrupt Controller 1, 8259A, Master
0040-005FTimer, 8254-2
0060-006F8742 (Keyboard Controller)
0070-007FReal-time Clock, NMI
(Non-maskable Interrupt) Mask
0080-009FDMA Page Memory, 74LS612
00A0-00BFInterrupt Controller 2, 8259A
00C0-00DFDMA Controller 2, 8237A-5
00E8Shadow RAM and Cache Control Bit
00F0Clear Numeric Processor
Extension Busy
00F1Reset Numeric Processor Extension
00F8-00FFNumeric Processor Extension
01F0-01F8Fixed Disk
0200-0207Game I/O
0278-027FParallel Printer Port 2
02F8-02FFSerial Port 2
0300-031FPrototype Card
0360-036FReserved
0378-037FParallel Printer Port 1
0380-038FSDLC, Bisynchronous 2
03A0-03AFBisynchronous 1
03B0-03BFMonochrome Display and Printer Adapter
03C0-03CFReserved
03D0-03DFColor/Graphics Monitor Adapter
03F0-03F7Diskette Controller
03F8-03FFSerial Port 1