1-14 Technical Information
Table Section 1-4 I/O Addresss Map
Address (Hex)
I/O Device Name
Location
Access
0000-000F
DMA controller 1 (channel 0-3)
ESC
R/W
0010-0018
EMS registers
R/W
0020-0021
Interrupt controller 1
ESC
R/W
0022-0023
ESC configuration index registers
ESC
R/W
0040-0043
System Timer 1
ESC
R/W
0048-004B
System Timer 2
ESC
R/W
0060-006E (even) Keyboard control
Keyboard controller
R/W
0060-006E (odd)
Port B
Keyboard controller
R/W
0061, 0070
NMI mask, Real-time clock (RTC)
ESC
R/W, W
0071-007F
RTC
RTC (bq4287)
R/W
0080-008F
DMA page register
ESC
RW/W
00A0-00A1
Interrupt controller 2
ESC (00A0-00A1)
R/W
00C0-00DE
DMA controller 2
ESC
R/W
00F0
Reset IRQ13
ESC
W
01F0-01F7
Hard disk control
System I/O controller
R/W
0278-027A
Parallel port 3
System I/O controller
R/W
02F8-02FF
Serial port 2
System I/O controller
R/W
0320-032F
Hard disk control
System I/O controller
R/W
0372
Secondary floppy disk digital output
register
ESC
W
0378-037A
Parallel port 2
System I/O controller
R/W
03BC-03BE
Parallel port 1
System I/O controller
R/W