Specifications

Appendix A: Chipset and I/O map
69
Table A-17. CPLD
I/O Addr Functional group R/W Usage
0180
–
018F
CPLD R/W See Ta b l e 4 - 3 , CPLD I/O ports on
page 56.
Ta b l e A - 1 8 . P r i m a r y I D E
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?)
Ta b l e A - 2 0 . E G A
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)
Table A-22. Serial I/O (COM 2) port
I/O Addr Functional group R/W Usage
x2F8 COM 2 serial port R
W
R/W
Receiver buffer
Transmitter buffer
Baud rate divisor latch (LSB)
x2F9 R/W
R/W
Interrupt enable register
Baud rate divisor latch (MSB)
x2FA R
W
Interrupt ID register
FIFO control register
x2FB R/W Line control register