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Appendix A: Chipset and I/O map
77
Table A-17. CPLD
I/O Addr
Functional group
R/W
Usage
0180
–
018F
CPLD, T8105
R/W
See
Table 4-7
,
CPLD I/O ports
on
page 62
.
Table A-18. Primary IDE
I/O Addr
Functional group
R/W
Usage
01F0
Primary IDE
R/W
Data
01F1
R/W
Error/features
01F2
R/W
Sector count
01F3
R/W
Sector number
01F4
R/W
Cylinder low
01F5
R/W
Cylinder high
01F6
R/W
Drive/head
01F7
R/W
Status/command
Table A-19. ISA Plug and Play
I/O Addr
Functional group
R/W
Usage
x279
ISA Plug and Play
R/W
(Undocumented source?)
Table A-20. EGA
I/O Addr
Functional group
R/W
Usage
x2B0–
x2DF
EGA
R/W
(For compatibility reasons)
Table A-21. Serial I/O (COM 4) port
I/O Addr
Functional group
R/W
Usage
02E8–
02EF
COM 4 serial port
R/W
COM 2 moved to COM 4 (see register
description at COM 2)
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