Appendix D − I/O Map
Address (hex)
0000 - 000F
0020 - 0021
002E - 002F
0040 - 0043
0048 - 004B
0060
0061
0064 0070, bit 7 0070, bits 6:0 0071 0078 0079
0080 - 008F
00A0 - 00A1
00C0 - 00DE
00F0
0170 - 0177
01F0 - 01F7
0200 - 0207
0220 - 022F
0278 - 027B
02F8 - 02FF
0330 - 0331
0376
0377
0378 - 037F
Size
16bytes
2bytes
2bytes
4bytes
4bytes
1byte
1byte
1byte
1bit
7bits
1byte
1byte
1byte
16bytes
2bytes
31bytes
1byte
8bytes
8bytes
8bytes
8bytes
4bytes
8bytes
1bytes
1byte
1byte
8bytes
Description
PIIX - DMA 1
PIIX - Interrupt
Ultra I/O configuration PIIX - Timer 1
PIIX - Timer 2 Keyboard Controller PIIX - NMI, speaker Kbd Controller, PIIX - Enable NMI PIIX - Real Time PIIX - Real Time Reserved - Brd. Reserved - Brd. PIIX - DMA Page PIIX - Interrupt PIIX - DMA 2 Reset Numeric Error Secondary IDE Primary IDE Channel Game Port
Parallel Port 2
MPU - 401 (MIDI)
Sec IDE Chan Cmd
Sec IDE Chan Stat
Parallel Port 1
Address (hex)
0388 - 038B
03B4 - 03B5 03BA 03BC - 03BF 03C0 - 03CA 03CC 03CE - 03CF 03D4 - 03D5 03DA
03E8 - 03EF
03F0 - 03F5
03F6
03F7 (Write) 03F7, bit 7 03F7, bits 6:0 03F8 - 03FF LPT + 400h 04D0 - 04D1 0608 - 060B 0CF8* 0CF9
Size
4bytes
2bytes
1byte
4bytes
12bytes
1byte
2bytes
2bytes
1byte
8bytes
6bytes
1byte
1byte
1bit
7bits
8bytes
8bytes
2bytes
4bytes
4bytes
1byte
4bytes
8bytes
8bytes
8bytes
8bytes
Description
Parallel Port 3
Serial Port 3
Floppy Channel
Pri IDE Chan
Floppy Chan 1
Floppy Disk
Pri IDE Chan
ECP port, LPT
Edge/Level
PCI Config
Turbo & Reset
PCI Config Data
IDE Bus Master IDE primary IDE secondary
Table
I/O Port 78 is reserved for BIOS use. Port 79 is a read only port, the bit definitions are shown below in Table
Bit #
0
1
2
3
4
5
6
7
Description
Reserved
Soft Off capable power supply present
Onboard Audio present
External CPU clock External CPU clock Setup Disable Clear CMOS Password Clear
Bit = 1
n/a No Yes Table
Enable access
Keep values Keep password
Bit = 0
n/a Yes No Table
Disable access
Clear values
Clear password
Table
Advanced/RH Technical Product Specification ∙ Page 29
