Impulse 3420 User Manual

Page 7

Card

Setup

Sealevel Systems COMM+8 Page

“PAL” Addressing

If header E11 is set to the “PAL” position, the board can be addressed at a
customized location. Using the “PAL” option will allow you to obtain
COM1: - COM4: addresses, XENIX COM: addresses, or any other
standard or nonstandard address configuration. Using the “PAL” feature is
a very cost-effective means of solving complex addressing problems. For
more information on implementing the “PAL” option, please contact
Sealevel Systems Technical Support.

IRQ Selection

Each port on the COMM+8 has an interrupt jumper that may have to be
set prior to use. The software you are using with the board will determine
which interrupts, if any are to be used. The DOS serial port interface
software does not use interrupts, while interrupt buffer programs do. DOS
does not require the interrupt to be set, while most Multi - User Operating
Systems will. Consult the particular manual for the software that you are
using to determine the proper setting.

To set the interrupt for a particular port, first select the header for the port
desired. Headers E1-E8 correspond to Ports 1-8. Next select an IRQ by
placing one of the jumpers on the header location that corresponds to the
IRQ number that you wish to use. Below is an example of a selected IRQ.

2 3 4 5 6 7 10 11 12 15

Figure 3 - Headers E1 to E8 (IRQ15 selected)