F$SSWI
From NitrOS-9
| Set SWI | Sets the SWI, SWI2, and SWI3 vectors |
| OS9 F$SSWI 103F 0E |
Entry Conditions
A SWI type code
X address of the user software interrupt routine
Error Output
C carry set on error
B error code (if any)
Additional Information
- Sets the interrupt vectors for SWI, SWI2, and SWI3 instructions.
- Each process has its own local vectors. Each Set SWI call sets one type of vector according to the code number passed in Register A:
1 SWI
2 SWI2
3 SWI3
- When NitrOS-9 creates a process, it initializes all three vectors with the address of the NitrOS-9 service call processor.
- Warning: Microware-supplied software uses SWI2 to call NitrOS-9. If you reset this vector, these programs cannot work. If you change all three vectors, you cannot call NitrOS-9 at all.
krnp2
