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4 2IQEC2/43798 Manual
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 433-5105
Table 1. Address Switches
1st Digit 2nd Digit
Switch
Position
7 654321
Bus
Connection
SA10 SA9 SA8 SA7 SA6 SA5 SA4
Decimal
Weight
1024 512 256 128 64 32 16
Hex Weight
400 200 100 80 40 20 10
To set the address of the 2IQEC2/4 card at some common
locations, follow the switch settings shown in Table 2.
Table 2. Frequently Unused Port Addresses
Base
Hex
Address
Binary
Equivalent
Switch
Settings
MSB LSB
7654321
I/O Space
Description
200 1000000000 0100000 game port
300 1100000000 0110000 prototype
310 1100010000 0110001 prototype
380 1110000000 0111000 SDLC
3A0 1110100000 0111010 bisync com
To install at another address, follow the procedure below.
1. Select the address. Using an I/O port usage table (one is
included in Appendix A) select an unused hex address
space. Note that the card occupies 16 bytes of I/O space.
Use caution when selecting a port address. It is very
important that nothing else is installed at the selected
address.
2. Convert the hex address to its binary equivalent.
3. Throw away the 4 least significant bits.
4. The remaining 7 digits represent the switch address. 1's
represent an OFF switch. 0's represent an ON switch.