OS_Byte 177 (changes)
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Programmer's OS Reference SWI Manuals Calls
» Part OS_Byte 15 – SWI Calls
» OS_Byte 177OS
» OS_Byte
» OS_Byte 177
OS_Byte 177
(SWI &06)
| Entry | |
|---|---|
| R0 | 177 (&B1) |
| R1 | 0 |
| R2 | 255 |
| Exit | |
|---|---|
| R0 | Preserved |
| R1 | Input source |
| R2 | Corrupted |
Use
The purpose of this call is to read a character from either the keyboard or serial buffer.
Notes
This returns the number of the buffer from which character input gets characters assuming Exec is not enabled – see OS_Byte 198).
You must not use any numbers than 0 and 255 for R1 and R2 – to change this variable use OS_Byte 2.
See also
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