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Programmer's Reference Manuals

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» Software Vector NumbersUKPLOTV

Unknown Plot Vector (25)

Use

This vector is called when an VDU 25 plot command or OS_Plot SWI is issued with an unknown parameter.

Notes

Whenever an unrecognised byte is found following 25 in the VDU stream, or OS_Plot is called with an unrecognised R0, then this vector is called. R0 contains this unknown plot command code – the current and 3 previous positions of the graphics cursor can be read with OS_ReadVduVariables from variables &8C – &93, allowing custom plot routines to be implemented.
The default owner of this vector does nothing – unknown plot options are ignored.

See also

• OS_Plot
• OS_ReadVduVariables
• Software Vector Numbers
• VDU 25