7
7-4
PG 760 Programming Device
C79000-G7076-C761-01
Table 7-2
I/O address assignment
Address
Size
Function
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
COM2
0300
031F
32
Programming equipment can be switched off
in SETUP
Then vacant
0320
033F
32
Not used
(XT hard disk), SCSI adapter
(AHA1540B)
0340
035F
8
HighGraph (CPU) host interface expansion
card
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
03D0
03DF
16
CGA / VGA control register
Hardware Information