7
7-4
Programming Device PG 740
C79000-G7076-C742-01
Table 7-2 I/O Address Assignments
Address Size
ÁÁÁÁÁÁÁÁÁ
Function
ÁÁÁÁÁÁÁÁÁ
from to Byte
Basic Function
Possible Alternative Function
0000 000F 16
PiiX DMA 1
0020 0021 2
PiiX PIC 1 (interrupt controller)
002E 002F 2
Configuration port Ultra I/O
0040 0043 4
PiiX Timer1 (SW
clock/refresh/speaker)
0060 0060 1
Keyboard controller date
0061 0061 1
PiiX NMI, speaker control
0063 0063 1
Write-only PG configuration port
0064 0064 1
Keyboard controller CMD/STATUS
0070 0070 1
PiiX NMI enable, RTC index
0071 0071 1
RTC date
0080 008F 16
PiiX DMA page register
00A0 00A1 2
PiiX PIC2 interrupt controller
00B2 00B3 2
PiiX power management control, status
00C0 00DE 31
PiiX DMA 2
00F0 00F0 1
Reset numeric error
0100 010F 16
Not used
0170 0177 8
Secondary IDE channel
01F0 01F7 8
Primary IDE channel
0200 020F 16
Game I/O expansion card
Otherwise vacant
0278 027B 4
LPT 2 not used
02F0 02F7 8
GBIP adapter expansion card
Otherwise vacant
02F8 02FF 8
COM 2
0300 031F 32
ÁÁÁÁÁÁÁÁÁ
Programming equipment can be
switched off in SETUP
ÁÁÁÁÁÁÁÁÁ
Then vacant
0320 033F 32
Not used
(XT hard disk), SCSI adapter
(AHA1540B)
0340 035F 8
ÁÁÁÁÁÁÁÁÁ
HighGraph (CPU) host interface
expansion card
ÁÁÁÁÁÁÁÁÁ
Otherwise vacant
0360 036F 16
PC-Net expansion card
Otherwise vacant
0370 037F 16
Floppy 2 not used
0376 0376 1
Second IDE command
0377 0377 1
Second IDE status
0378 037F 8
LPT 1
0380 038F 16
SDLC 2 expansion card
Otherwise vacant
03A0 03AF 16
SDLC 1 expansion card
Otherwise vacant
03B0 03BB 12
B/W monitor interface/VGA
03BC 03BF 4
LPT x not used
Not used
03C0 03CF 16
VGA control register
Hardware Information