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Appendix Error! Main Document Only.Error! Main Document Only.7 - Configuring
Your Controller
AccuTouch PC-Bus Controller (E271-141) and DuraTouch PC-Bus
Controller (E271-142)
Verify the controller's switch settings are as follows:
For:
12-bit Mode (recommended)
8-bit Mode
No calibration data on reset
Stream Mode
Filtered
The 12-bit Mode is recommended, although if the resolution provided by a
nominal 255x255 screen is adequate, then 8-bit Mode may be preferred because of
its lower interrupt overhead. (The controllers deduct overscan and inaccessible
areas, typically returning a range of 28 to 227, for example.)
Next, set the controller's Base I/O Port address with the W2 and W3 jumpers. W3
selects the high order address, and W2 the low order address. The values of the
setting are shown in the following table:
Position
(from top)
1
2
3 (recommended)
4
To calculate the Base I/O Port address, add the values of jumpered positions W3
and W2. For example, the E271-141 is usually shipped jumpered for a Base I/O
Port address of 280 hexadecimal. W3 is jumpered in the 3rd position (200), and
W2 is jumpered in the 5th position (80). The address is the sum of 200 + 80,
which is 280.
Next, install a jumper vertically at W1 to select the Interrupt (IRQ). A jumper is
supplied, but may be found in a horizontal, inactive position. See Choosing an
Interrupt (IRQ) for PC-Bus Controllers, page 74. The jumper block positions are
as follows:
W3
Value
(in hex)
000
100
200
300
Set:
SW1-ON
SW1-OFF
SW2-ON
SW3-OFF
SW4-ON
W2
Position
(from left)
1
2
3
4 (recommended)
5
6
7
8
Value
(in hex)
E0
C0
A0
80
60
40
20
00
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