OS_Memory 9 (changes)

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Programmer's OS Reference SWI Manuals Calls

» Part OS_Memory 15 – SWI Calls

» OS_Memory 9OS

OS_Memory 9

(SWI &68)

Use

The purpose of this call is to check for the presence of a given controller and return its base logical address if present. The behaviour of this SWI differs slightly between RISC OS 5 and RISC OS Select/Adjust. Under RISC OS 5 the SWI will return an error if the controller number is unrecognised, or 0 if the controller isn’t present. Under RISC OS Select/Adjust the SWI will return an error under both situations. Also under RISC OS Select/Adjust, even if the controller exists there is no guarantee that the memory will have been mapped in by the kernel. Therefore programs should also use OS_Memory 25 where appropriate, in order to allow them to map in the memory themselves.

See also

• OS_Memory
• OS_Memory 9 Controller Numbers
• OS_Memory 25