21-1
PC-500 user’s manual
User-defined jumper
Chapter 21:
User-defined jumper
≡
User-defined jumper
Jumpers W3[9-10](UA) and W4[5-6](UB) are user-defined jumpers. For
program direction, read these jumpers by code in your program.
Table 21-1
User option jumper: W3
Pins
Label
Description
[9–10]*
UA
User option jumper A
* = default
Table 21-2
User option jumper: W4
Pins
Label
Description
[5–6]*
UB
User option jumper B
* = default
Read jumpers
This section provides the definition for the Read jumpers function.
Function:
fbh
Subfunction:
0Bh
Purpose:
To read the on-board jumper settings.
Calling registers:
Ah
fbh
AL
0Bh
DX
ffffh
Return registers:
AL
Jumper information
bit
state
7
Not used
6
Not used
5
Not used
4
Not used
3
Not used
2
Not used
1
User option jumper B
0
User option jumper A
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