Measurement Computing Personal488 rev.1.0 - Manual (Page 34)

4-8 Hardware Configuration Reference 889496 Personal488 for Windows 95/98/Me/NT/2000/XP
Configuring the GP488B Interface I/O Base Address
The factory default I/O base address is 02E1. If this creates a conflict, reset SW1 micro-
switches 4 and 5 according to the figure and following table. The register addresses will be
automatically relocated at fixed offsets from the base address. If reset, record the new
Input/Output (I/O) address being used.
The I/O base address sets the addresses used by the computer to communicate with the IEEE
488 interface hardware on the board. The address is normally specified in hexadecimal and
can be 02E1, 22E1, 42E1, or 62E1. The registers of the IOT7210 IEEE 488 controller chip
and other auxiliary registers are then located at fixed offsets from the base address.
Most versions of Driver488 are capable of managing as many as four IEEE 488 interfaces. To
do so, the interface configurations must be arranged to avoid conflict amongst themselves.
No two boards may have the same I/O address; but they may, and usually should, have the
same DMA channel and interrupt level.
Configuring the GP488B Interface Interrupt (IRQ)
J4
IRQ7
IRQ5
IRQ6
IRQ4
IRQ2
IRQ3
SW1
Interrupt
Level 6 Interrupt
Level 2 Interrupt
Level 3 Interrupt
Level 4
GP488B Interrupt Selections
6
7
8
6
7
8
6
7
8
6
7
8
5 5 5 5
2
3
2
3
2
3
2
3
OP
E
N
OP
E
N
O
PEN
O
PEN
1 1 1 1
4 4 4 4
Interrupt
Level 5
6
7
8
5
2
3
OP
E
N
14
6
7
8
5
2
3
OP
E
N
14
Interrupt
Level 7
The factory default Interrupt (IRQ) is 5. If this creates a conflict, reset SW1 micro-
switches 1, 2, and 3, and jumper J4 according to the figure. The switch and jumper
settings must both indicate the same interrupt level for correct operation with
interrupts. If reset, record the new Interrupt (IRQ) being used.