
Technical Information 1-7
5F
640 x 480
8 x 16
80 x 30
256/256
25.0
31.5
60.0
NOTE: * External display only.
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
Interrupt Level
378h (LPT 1) *
IRQ07
278h (LPT 2)
IRQ05
3BCh (LPT 3)
IRQ07
*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
Interrupt Level
3F8h (COM 1) *
IRQ04
2F8h (COM 2)
IRQ03
3E8h (COM 3)
IRQ04
2E8h (COM 4)
IRQ03
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