communication, known as COM 1 and COM 2. Most computers and software also
support COM 3 and COM 4. COM ports 3 and 4 are used whenever other devices
are using COM ports 1 and 2. COM 5 is not a standard COM port, but it can be
accessed with special software.
An IRQ (interrupt request) is a signal generated by an I/O device that notifies the
computer of incoming data. Your computer has many different IRQ lines, each
assigned a number. Your Vanguard 100 PC is capable of using IRQs 3,4, 5, 10,
11, and 15.
I/O devices in your computer cannot share an IRQ with another
device at the same time. For example, your PC mouse and Vanguard 100 PC
cannot have the same IRQ setting.
The Vanguard 100 PC allows flexibility in choosing the COM port, I/O address,
and IRQ line. However, the common IRQ assignments for COM 2 to COM 5
ports are:
COM Port
IRQ
Addresses
2
3
02F8H
3
4
03E8H
4
3
02E8H
5
01A8H
Refer to your COM software documentation for additional information regarding
COM and IRQ settings and assignment information.
Use the shorting straps to set jumpers to the appropriate values as shown in
Figures 1-6 and 1-7. Note that an unused shorting strap should be stored on a
single post in the "Not in Use" position.
Figure 1-6. COM Port Jumper Settings
