OS_Byte 3 (changes)
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Programmer's OS Reference SWI Manuals Calls
» Part OS_Byte 15 – SWI Calls
» OS_Byte 3OS
» OS_Byte
» OS_Byte 3
OS_Byte 3
(SWI &06)
| Entry | |
|---|---|
| R0 | 3 |
| R1 | Bit mask for output streams |
| Exit | |
|---|---|
| R0 | Preserved |
| R1 | Value before being overwritten |
| R2 | Corrupted |
Use
The purpose of this call is to select the devices to which all subsequent output from OS_WriteC (and related SWIs) should be sent.
Notes
The state of this variable can be read and written with OS_Byte 236.
Enabling the serial device and printer with this OS_Byte and setting the printer to the serial device with OS_Byte 5 causes characters to be placed in both serial and printer buffers, which both are then fed to the serial port.
See also
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