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pulse to port 61H to clear the interrupt for the next byte. Refer to Appendix D for the keyboard
connector location and pin assignments.
MOUSE PORT
The IRV-3702 SBC contains an IBM PS2 compatible mouse port for interfacing to a generic serial
mouse. The mouse port controller assembles the serial data from the mouse into bytes and interrupts
the CPU via IRQ1 after each byte is ready to be read. The IRQ1 service routine reads port 60H to get
the scan code and acknowledges by sending a positive pulse to port 61H to clear the interrupt for the
next byte. Refer to Appendix D for the mouse port connector location and pin assignments.
SPEAKER PORT
The IRV-3702 SBC contains an on-board sub-miniature audio speaker to provide audio interface to the
user. Because of the small size of the speaker, the sound output is much reduced over that of the larger
speaker found in most desktop computers. A connector is provided to connect an external speaker if
the sound output is not sufficient. Refer to Appendix D for the speaker port connector location and pin
assignments.
RESET SWITCH
The IRV-3702 SBC includes an on-board power detector and power on reset circuit to reset the
computer after power is applied, and to hold the computer reset during low power, brown-out
conditions. In addition, there are provisions for connecting an external, normally open, push button
reset switch. Refer to Appendix D for the reset switch connector location and pin assignments.
PRINTER PORT
The IRV-3702 SBC contains a multimode parallel port that has the equivalence of an IBM PC/AT
Parallel Printer Port. The multimode parallel printer port supports the PS/2 type bi-directional parallel
port (SPP), the enhanced parallel port (EPP), and the extended capabilities port (ECP) parallel port
modes. The port can be configured as a standard IBM PC/AT compatible LPT1, LPT2, or LPT3 printer
port, or disabled completely using the CMOS Setup utility. Refer to Appendix D for the connector
location and pin assignments.
SERIAL PORTS
The IRV-3702 SBC has the equivalence of two NC16C550 UARTs. The two UARTs can be configured
as standard IBM PC/AT RS-232C compatible COM1, COM2, COM3, or COM4 serial ports or
individually disabled using the CMOS Setup utility. The data rates are independently programmable
up to 115.2K baud. Refer to Appendix D for the connector location and pin assignments.
FLOPPY DISK PORT
The IRV-3702 SBC contains an IBM PC/AT compatible dual floppy disk port with the equivalence of
an NEC PD72056B Floppy Disk Controller, an on-chip digital data separator, and an IBM PC/AT
compatible floppy disk adapter bus interface circuit. The floppy disk port can be disabled using the
CMOS Setup utility. An on-chip digital data separator provides optimum performance with the
following disk drive types:
5.25" 360K Double-Sided
3.5" 720K High Capacity
5.25" 1.2M High Capacity
3.5" 1.44M High Density
3.5" 2.88M High Density
Refer to Appendix D for the connector location and pin assignments.