2.9.1
Standard Register Set
The standard register set is equal to all standard PC/AT systems. The table below provides an overview
of the address ranges occupied by these registers.
I/O Address
Range (Hex)
Function
0000 - 000F
DMA Controller 1
0020 - 0021
Interrupt Controller 1
0040 - 0043
Counter/Timer
0060
Keyboard Controller
0061
NMI Status and Control
0064
Keyboard Controller
0070 - 0071
RTC, NMI Mask
0080 - 008F
DMA Page register
00A0 - 00A1
Interrupt Controller 2
00B2 - 00B3
Power Management
00C0 - 00DE
DMA Controller 2
00F0 - 00F1
Coprocessor
01F0 - 01F7
EIDE/ATAPI
0278 - 027F
LPT
1)
02E8 - 02EF
COM4
2) 1)
02F8 - 02FF
COM2
1)
0378 - 037F
LPT
1)
03BC - 03BF
LPT
1)
03C0 - 03DA
Graphic Controller
03E8 - 03EF
COM3
2) 1)
03F2 - 03F7
Floppy, EIDE/ATAPI
03F8 - 03FF
COM1
1)
1)
Via setup three address ranges can be defined for up to two parallel interfaces and four address
ranges for four serial interfaces.
2)
These I/O addresses are only used by optional devices.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com