Changing Hardware Configuration Settings
Appendix C
AT-GPIB/NI-488M/AT&T UNIX
C- 2
© National Instruments Corp.
Note :
Shut down the operating system and power down the computer
before you take off the board to change the configuration.
Switch and Jumper Settings
Table C-1 shows the default settings and available hardware configurations
for the AT-GPIB.
Table C-1. Default Settings and Available Configurations
AT-GPIB
Default
Settings
Available
Configurations
Base I/O Address
(hex)
2C0
100 to 3E0
DMA Channel
5
5, 6, 7, and
Not Used
Interrupt Line (IRQ)
11
3, 4, 5, 6, 7, 9, 10,
11, 12, 14, 15, and
Not Used
Base I/O Address Selection
The base I/O address is determined by the switches at position U25. The
switches are set at the factory for the base I/O address 2C0 hex. The
AT-GPIB uses the I/O address space 2C0 through 2DF hex with this setting.
If you install more than one AT-GPIB interface board in your computer,
each board must be configured to use a unique base I/O address. The
default AT -GPIB base I/O addresses for the NI-488M software for AT&T
UNIX are shown in Table C-2.