OS_Byte 217 (changes)
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Programmer's OS Reference SWI Manuals Calls
» Part OS_Byte 15 – SWI Calls
» OS_Byte 217OS
» OS_Byte
» OS_Byte 217
OS_Byte 217
(SWI &06)
| Entry | |
|---|---|
| R0 | 217 (&D9) |
| R1 | EOR value |
| R2 | AND value |
| Exit | |
|---|---|
| R0 | Preserved |
| R1 | Previous count |
| R2 | Corrupted |
Use
The purpose of this call is to read or write the count of lines displayed since the last halt when in paged mode? (VDU 14).
Notes
This call reads or sets the count of lines displayed since the last page halt when in. Usually this call is used to set the count to 0, before requesting user input – OS_ReadLine makes this call automatically.
See also
- OS_Byte
- OS_ReadLine
- VDU 14?
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