AR-B1476 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
ALI M1489/M1487
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 2 (LPT 2)
2E8-2EF
Serial port 4 (COM 4)
2F8-2FF
Serial port 2 (COM 2)
300-31F
Prototype card/streaming type adapter
320-33F LAN
adapter
378-37F
Parallel printer port 1 (LPT 1)
380-38F SDLC,
bisynchronous
3A0-3AF Bisynchronous
3B0-3BF
Monochrome display and printer port 3 (LPT 3)
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 (Bus1)
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
-SMEMW
Output
A12
SA19 Input/Output
B12
-SMEMR 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
