OS_GenerateError (changes)

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OS SWI Calls

» OS_GenerateError

OS_GenerateError

(SWI &2B)

Use

The purpose of this call is to generate an error and invoke the error handler.

Notes

The X form may appear to be completely useless as it is effectively! effectively a no-op!

However, it has at least 3 uses

1. Terminated string conversion in BASIC
2. Detecting whether OS_CallASWI is available by calling it OS_GenerateError via OS_CallASWI and seeing what comes back in R0
3. Force a callback to occur by calling its X form

See also

• OS_CallASWI
• SWI Error Block