Omega OMB-PER-488/W95 User Manual page 41

The I/O base address, IRQ, and DMA settings are switch/jumper selectable via the following locations
on the GP488B/MM interface board: One 8-microswitch DIP switch labelled SW1, two 12-pin headers
labelled JP2 and JP3, and one 3-pin header labelled JP1. The DIP switch settings, and the arrangement
of the jumpers on the headers set the hardware configuration.
For the next steps, make sure that the I/O address, IRQ, and DMA, set on the interface board are
different from any existing ports in your system. A conflict results when two I/O addresses, IRQs, or
DMAs are the same. (As the exception, additional GP488B interfaces may share the same IRQ and
DMA values.) If there is a conflict, perform the following steps to select new switch/jumper settings.
Step 2: Configuring the GP488B/MM Interface I/O Base Address
1. The factory default I/O base address is
and 5 according to the figure and following table. The register addresses will be automatically
relocated at fixed offsets from the base address.
2. If reset, record the new Input/Output (I/O) address being used.
02E1
02E1
06E1
0AE1
0EE1
12E1
16E1
1AE1
1EE1
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
,
22E1 42E1
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 board configurations must be arranged to avoid conflict among 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.
Personal488 User's Manual For Windows 95 and Windows NT
Selected I/O Base Address
22E1 42E1
Automatic Offset Addresses
22E1 42E1
26E1 46E1
2AE1 4AE1
2EE1 4EE1
32E1 52E1
36E1 56E1
3AE1 5AE1
3EE1 5EE1
, or . The registers of the IOT7210 IEEE 488 controller chip and other auxiliary
62E1
. If this creates a conflict, reset SW1 microswitches 4
02E1
62E1
Read Register
62E1 Data In
66E1 Interrupt Status 1
6AE1 Interrupt Status
6EE1 Serial Poll Status
Address Status
72E1
76E1 CMD Pass Through
7AE1 Address 0
7EE1 Address 1
Personal488/MM (with GP488B/MM)
Register
Write Register
Data Out
Interrupt Mask 1
Interrupt Mask 2
Serial Poll Mode
Address Mode
Auxiliary Mode
Address 0/1
End of String
,
02E1
35