Chapter 3
Software Installation and Configuration
© National Instruments Corp.
3-5
AT-GPIB/NI-488M/AT&T UNIX
DMA Channel
Open the
./Master
file, which contains the following lines:
ib
ocrwis
ircH
ib
0
0
1
2
5
ib
ocrwis
ircH
ib
0
0
1
2
6
If you installed only one AT-GPIB board, change only the first line of
information.
The last field contains the DMA channel used by the GPIB. The default is
channel 5. To disable DMA, change the setting to -1. To select another
DMA channel, enter the number of that DMA channel.
Base I/O Address and Interrupt Vector Number
Open the
./System
file, which contains the following lines:
ib
Y
1
6
1
11
2C0
2DF
0
0
ib
Y
1
6
1
10
240
25F
0
0
If you installed only one AT-GPIB board, change only the first line of
information.
The sixth field is the interrupt vector number.
The seventh field is the starting I/O address (in hex) of the board.
The eighth field is the ending I/O address (in hex) of the board.
The seventh and eighth fields must be in the range between 0 and 3FF for
the AT-GPIB. The value of the eighth field is obtained by adding 31
decimal or 1F hex to the value of the seventh field.
If you changed the base I/O address, interrupt vector number, or DMA
channel settings, record the settings on the AT-GPIB Hardware and
Software Configuration Form located in Appendix D.