AC37 High-Speed Communication Adapter Card
AC37: IBM AT TO REMOTE BUS ADAPTER CARD
1-2
ADDRESS SELECTION:
There are seven address jumpers on the AC37 labeled A3 through A9. These jumpers are used to select the
base address of the adapter card.The IBM PC-AT and compatibles only use 10 address lines for addressing I/O
locations. Since the AC37 card uses the three lower address lines directly, the upper seven (A3 through A9) are
used to decode the base address of the card.
Address jumpers A3 through A9 correspond to address lines A3 through A9. When a jumper is installed, the
jumper value is zero. A jumper not installed will indicate a one. When the address lines of the AT match the
jumper settings, the card is selected.
The base address must be less than 3FF Hex and have a zero or eight as the last digit. Care should be taken to
select a base address which will not conflict with other devices in the system.
Sample addresses and jumper settings are shown below:
Port
Hex
Address
A Group Jumpers
IRQ
Group
Jumper
G4 Int
Select
Jumper
A9
A8
A7
A6
A5
A4
A3
COM1
3F8
0
0
0
0
0
0
0
IRQ4
IRQ15
COM2
2F8
0
X
0
0
0
0
0
IRQ3
IRQ15
COM3
3E8
0
0
0
0
0
X
0
IRQ4
IRQ15
COM4
2E8
0
X
0
0
0
X
0
IRQ3
IRQ15
OPTO COM3
348
0
0
X
0
X
X
0
IRQ2
IRQ15
OPTO COM4
340
0
0
X
0
X
X
X
IRQ5
IRQ15
OPTO COM5
248
0
X
X
0
X
X
0
IRQ10
IRQ15
OPTO COM6
240
0
X
X
0
X
X
X
IRQ11
IRQ15
X = Jumper installed
0 = Jumper not installed
Updated: 10-28-02
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