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AR-B1579 User's Guide
2-3
2.3.1 I/O Port Address Map
Hex Range
Device
000-01F
DMA controller 1
020-021
Interrupt controller 1
022-023
SiS 5598 Chipset Address
040-04F Timer
1
050-05F Timer
2
060-06F 8042
keyboard/controller
070-071
Real-time clock (RTC), non-maskable interrupt (NMI)
080-09F
DMA page registers
0A0-0A1
Interrupt controller 2
0C0-0DF
DMA controller 2
0F0
Clear Math Co-processor
0F1
Reset Math Co-processor
0F8-0FF Math
Co-processor
170-178
Fixed disk 1
1F0-1F8
Fixed disk 0
201
Game port
208-20A
EMS register 0
218-21A
EMS register 1
278-27F
Parallel printer port 3 (LPT 3)
2E8-2EF
Serial port 4 (COM 4)
2F8-2FF
Serial port 2 (COM 2)
300-31F
Prototype card/Streaming Type Adapter
378-37F
Parallel printer port 2 (LPT 2)
380-38F SDLC,
bisynchronous
3A0-3AF Bisynchronous
3B0-3BF
Monochrome display and printer port 1 (LPT 1)
3C0-3CF EGA/VGA
adapter
3D0-3DF
Color/Graphics monitor adapter
3E8-3EF
Serial port 3 (COM 3)
3F0-3F7 Diskette
controller
3F8-3FF
Serial port 1 (COM 1)
Table 2-2 I/O Port Address Map
2.3.2 I/O Channel Pin Assignment
I/O Pin Signal Name Input/Output I/O Pin Signal Name Input/Output
A1 -IOCHCK Input B1 GND Ground
A2 SD7
Input/Output
B2
RSTDRV
Output
A3 SD6
Input/Output
B3 +5V Power
A4 SD5
Input/Output
B4
IRQ9 Input
A5 SD4
Input/Output
B5 -5V Power
A6 SD3
Input/Output
B6
DRQ2 Input
A7 SD2
Input/Output
B7 -12V Power
A8 SD1
Input/Output
B8
-ZWS Input
A9 SD0
Input/Output
B9
+12V Power
A10 IOCHRDY Input
B10 GND
Ground
A11 AEN Output
B11
-MEMW
Output
A12 SA19
Input/Output
B12
-MEMR Output
A13 SA18
Input/Output
B13 -IOW
Input/Output
A14 SA17
Input/Output
B14 -IOR
Input/Output
A15 SA16
Input/Output
B15
-DACK3 Output
A16 SA15
Input/Output
B16
DRQ3 Input
A17 SA14
Input/Output
B17
-DACK1 Output
A18 SA13
Input/Output
B18
DRQ1 Input