Measurement Computing Personal488 rev.3.0 - Manual (Page 48)

4-8 Hardware Configuration Reference 04-09-01 Personal488 for Windows 95/98/Me/NT/2000
Configuring the GP488B Interface I/O Base Address
he factory default I/O base address is 02E1 . If this creates a conflict, reset SW1 microswitches 4 and 5
ccording to the figure and following table. The register addresses will be automatically relocated at fixed
ffsets 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
IR Q 7
IR Q 5
IR Q 6
IR Q 4
IR Q 2
IR Q 3
S W 1
In te rru pt
L ev e l 6 In te rru pt
L ev e l 2 In te rru pt
L ev e l 3 In te rru pt
L ev e l 4
G P 4 8 8 B I n ter r u p t S e lec tio n s
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
In te rru p t
L e ve l 5
6
7
8
5
2
3
OP
E
N
14
6
7
8
5
2
3
OP
E
N
14
In te rru p t
L e ve l 7
The factory default Interrupt (IRQ) is 5. If this creates a conflict, reset SW1 microswitches 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.