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EPC-3307 Hardware Reference
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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
x2FC
R/W
Modem control register
x2FD
R
Line status register
x2FE
R/W
Modem status register
Table A-23. Secondary IDE
I/O Addr
Functional group
R/W
Usage
0374
Secondary IDE
Reserved
0375
Reserved
0376
R/W
Alt status/device control
Table A-24. Parallel I/O (LPT1) port
I/O Addr
Functional group
R/W
Usage
x378
LPT1 parallel port
R/W
Printer data register
x379
R
W
Printer status register
Printer status register (EPP only)
x37A
R/W
Printer control register
Table A-25. EPP port
I/O Addr
Functional group
R/W
Usage
x37B
EPP
R/W
EPP address port
x37C
R/W
EPP data port 0
x37D
R/W
EPP data port 1
x37E
R/W
EPP data port 2
x37F
R/W
EPP data port 3
Table A-26. VGA controller
I/O Addr
Functional group
R/W
Usage
x3B4
VGA controller
R/W
CRT controller index (mono)
x3B5
R/W
CRT controller data (mono)
x3BA
R
W
Input status register 1 (mono)
Feature control output (mono)
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