Parallel_Op 1 (changes)
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ParallelDeviceDriver
» SWI Calls
» Parallel_Op
» Parallel_Op 1
Parallel_Op 1
(SWI &42EC1)
| Entry | |
|---|---|
| R0 | 1 (Reason code) |
| R1 | Data to write |
| Exit | |
|---|---|
| R0 | Preserved |
| R1 | Preserved |
Use
The purpose of this call is to write the data and status registers taken from the printer port.
Notes
A copy of this data will be returned on the next read via Parallel_Op 0.
See also
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