OS_Byte 213 (changes)
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Programmer's OS Reference SWI Manuals Calls
» Part OS_Byte 15 – SWI Calls
» OS_Byte 213OS
» OS_Byte
» OS_Byte 213
OS_Byte 213
(SWI &06)
| Entry | |
|---|---|
| R0 | 213 (&D5) |
| R1 | EOR value |
| R2 | AND value |
| Exit | |
|---|---|
| R0 | Preserved |
| R1 | Previous frequency |
| R2 | Bell duration (see OS_Byte 214) |
Use
The purpose of this call is to read or write the sound frequency (pitch) for the bell.
Notes
This call reads or sets the bell pitch, which is a BBC style frequency in the range 0-255. The default pitch is 100.
To read/write the bell channel use OS_Byte 211. To read/write the volume use OS_Byte 212. To read/write the duration use OS_Byte 214.
See also
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