R0 = 2
R2 = pointer to routine (or 0 for no unknown object handler)
R3 = pointer to workspace
This routine will be called if the Render Draw File code encounters an
unknown object. The routine has the following entry and exit conditions:
Entry: (SVC mode)
R2 = pointer to object
R4 = pointer to scaling and position table
R6 = clipping rectangle XMin (pretransformed)
R7 = clipping rectangle YMin (pretransformed)
R8 = clipping rectangle XMax (pretransformed)
R9 = clipping rectangle YMax (pretransformed)
R12 = your workspace pointer
R13 = pointer to supervisor stack (at least 256 bytes guaranteed)
R14 = return address
Exit:
R1-R11,R13 preserved
V flag set on error, with R0 pointing to standard error block
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