ICS Advent 486MBS Series, Product Manual

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Chapter 1: Introduction
Manual Number: 41209-103-1 Page 1-5
Standard I/O Enable
The 486MBS Series standard I/O consists of the two serial ports, the parallel port and floppy disk
controller. Jumper JP17 is used to enable or disable these ports.
Table 1-1: Standard I/O Enable
CMOS Reset
This option is provided as a convenience for those who need to reset the CMOS registers. It should
always be set to “Normal” for standard operation. If the CMOS needs to be reset turn off the
system, move JP24 to 2-3, turn the system on, move JP24 back to 1-2 and reset the motherboard.
Table 1-2: CMOS Reset
I/O Port IRQ Selection
The parallel port and both serial ports must have their IRQs. Normally, these settings can be left in
their default settings and only when conflicts arise should they be changed. Jumper JP18 is used to
select the parallel port IRQ. Jumper JP19 is used to select the first serial port's IRQ. Jumper JP20
is used to select the second serial port's IRQ. Use Table 1-8 to select the IRQs for these options.
Table 1-3: I/O Port IRQ Selection