Entry | |
---|---|
R0 | VDU 23 option |
R1 | Pointer to VDU 23 queue |
Exit | |
---|---|
R0 | Preserved |
R1 | Preserved |
This vector is called when a VDU 23 command is issued with an unknown parameter.
Whenever an unrecognised byte (18-25,28-31) is found following 23 in the VDU stream this vector is called. R0 contains this unknown byte – it is also the first of the 9 bytes in the VDU queue, pointed at by R1.
The default owner of this vector does nothing – unknown VDU 23 options are ignored.