=> R1 = buffer number, bit 31 set for block insert
R9 = 20, &14 (vector number)
If single byte :
R0 = byte
<= R2 corrupt
C flag set if insertion failed
If block insert :
R2 = pointer to data
R3 = length of data
<= R2 = pointer to data still to insert
R3 = number of bytes left to insert
C flag set if insertion failed
All characters inserted into buffers are sent through this vector.
If called via OS_CallAVector then interrupts must be disabled first.
See PRM 1, page 82.
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