2. Getting Started
27
I/O Address Map
D00 - FFFFh
PCI
*
*
Onboard ISA peripherals
CF8 - CFFh
PCI Config/RST Control
addressed between
780 - CF7h
PCI Reserved
100h - 7FFh decode 11 bits
778 - 77Fh
LPT ECP Registers
of address (A0h - A10h).
400 - 777h
Reserved
Therefore, these peripherals
3F8 - 3FFh
COM1
will alias throughout the 16-bit
3F0 - 3F7h
Floppy / IDE Registers
I/O space at the following
3E0 - 3EFh
Reserved
ranges:
3B0 - 3DFh
VGA Registers
x100-x3FFh
380 - 3AFh
Reserved
x500-x7FFh
378 - 37Fh
LPT
x900-xBFFh
300 - 377h
Reserved
xD00-xFFFh
2F8 - 2FFh
COM2
PCI devices can fully utilize
200 - 2F7h
Reserved
the address space from
1F8 - 1FFh
Reserved
D00 - FFFFh, since subtractive
1F0 - 1F7h
Primary IDE Registers
decoding is used for the
178 - 1DFh
Reserved
onboard ISA devices.
170 - 177h
Secondary IDE Registers
100 - 16Fh
Reserved
F0 - FFh
Coprocessor
E6 - EFh
Reserved
E1 - E5h
ZT 5504 System Registers 1-5
E0Fh
Reserved
C0 - DFh
On-board Slave DMA Controller
B4 - BFh
Reserved
B2 - B3h
APM Registers
B0 - B1h
Reserved
A0 - AFh
On-board Slave Interrupt Controller
93 - 9Fh
Reserved
92h
Fast RESET and Gate A20
90 - 91h
Reserved
81 - 8Fh
On-board DMA Page Registers
80h
Diagnostic
Port
79h
Board's Watchdog Timer Register
78h
Board's System Register 0
70 - 77h
On-board Real-Time Clock
60 - 6Fh
Keyboard and System Ports
50 - 5Fh
Reserved
40 - 4Fh
On-board Timer/Counters
30 - 3Fh
Reserved
2E - 2Fh
87309 Super I/O Configuration
22 - 2Dh
Reserved
20 - 21h
On-board master Interrupt Controller
0 - 1Fh
On-board Master DMA Controller
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