Input/Output Controller; Parallel Port Addresses And Interrupts; Serial Port Addresses And Interrupts - NEC VERSA S Service Manual

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Input/Output Controller

The FDC37C665 input/output (I/O) controller provides the following interfaces:
n
RS-232C serial port
n
parallel (printer) port
n
diskette drive
n
IDE hard disk.
The user selects between three parallel interface modes using Auto Setup. These include
unidirectional, bidirectional or enhanced. Unidirectional mode sends data output from the
standard ISA port only. Bidirectional mode sends data using the standard ISA port or PS/2
technology. Enhanced mode enables high speed data transmission to occur using either the
unidirectional or bidirectional modes.
Parallel port addresses and interrupts are listed in Table Section 1-4. Pin locations for the
parallel interface are listed in Appendix A.
Table Section 1-4 Parallel Port Addresses and Interrupts
Starting I/O Address
378h (LPT 1) *
278h (LPT 2)
3BCh (LPT 3)
*Default
The serial port consists of a 16450 compatible serial port controller with a programmable
baud rate within 50/115.2 K bps. See Table Section 1-5 for the available addresses and in-
terrupts.
Table Section 1-5 Serial Port Addresses and Interrupts
Starting I/O Address
3F8h (COM 1) *
2F8h (COM 2)
3E8h (COM 3)
2E8h (COM 4)
8 x 16 80 x 30
Technical Information
256/256 25.0 31.5
Interrupt Level
IRQ07
IRQ05
IRQ07
Interrupt Level
IRQ04
IRQ03
IRQ04
IRQ03
1-7
60.0