Specifications

EPC-3305 Hardware Reference
72
Table A-32. Serial I/O (COM 1) port
I/O Addr Functional group R/W Usage
3F8 COM 1 serial port R
W
Receiver buffer
Transmitter buffer
R/W Baud rate divisor latch (LSB)
3F9 R/W Interrupt enable register
R/W Baud rate divisor latch (MSB)
3FA R
W
Interrupt ID register
FIFO control register
3FB R/W Line control register
3FC R/W Modem control register
3FD R Line status register
3FE R/W Modem status register
Table A-33. Interrupts
I/O Addr Functional group R/W Usage
04D0 Interrupts R/W INT1 Edge/level control
04D1 R/W INT2 Edge/level control
Table A-34. ECP registers
I/O Addr Functional group R/W Usage
x778 ECP registers R/W FIFO
x779 R/W Configuration register B
x77A R/W Extended control register
Table A-35. ISA Plug and Play
I/O Addr Functional group R/W Usage
0A79 ISA Plug and Play R/W Data register
Table A-36. 443BX configuration address register
I/O Addr Functional group R/W Usage
0CF8–
0CFB
(
DWORD
only)
443BX configuration
address register
R/W Configuration address register
Table A-37. PIIX4E
I/O Addr Functional group R/W Usage
0CF9 PIIX4E R/W Turbo reset control register