Personal488 User's Manual For Windows 95 and Windows NT
Personal488/MM (with GP488B/MM) 35
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
02E1
. If this creates a conflict, reset SW1 microswitches 4
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.
Selected I/O Base Address
Register
02E1
22E1
42E1
62E1
Automatic Offset Addresses
Read Register
Write Register
02E1
22E1
42E1
62E1
Data In
Data Out
06E1
26E1
46E1
66E1
Interrupt Status 1
Interrupt Mask 1
0AE1
2AE1
4AE1
6AE1
Interrupt Status
Interrupt Mask 2
0EE1
2EE1
4EE1
6EE1
Serial Poll Status
Serial Poll Mode
12E1
32E1
52E1
72E1
Address Status
Address Mode
16E1
36E1
56E1
76E1
CMD Pass Through
Auxiliary Mode
1AE1
3AE1
5AE1
7AE1
Address 0
Address 0/1
1EE1
3EE1
5EE1
7EE1
Address 1
End of String
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 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.
Summary of Contents for OMB-PER-488/W95
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Page 38: ...32 Personal488 with GP488B Personal488 User s Manual For Windows95 and Windows NT Notes...
Page 52: ...46 Driver488 W95 Driver488 WNT Personal488 User s Manual For Windows95 and Windows NT Notes...
Page 136: ...130 Appendix Personal488 User s Manual For Windows95 and Windows NT Notes...
Page 139: ...Personal488 User s Manual For Windows 95 and Windows NT Index 133 Notes...
Page 142: ...136 Abbreviations Personal488 User s Manual For Windows95 and Windows NT Notes...