=> R0 = previous handle, 0 to start
<= R0 = next handle, 0 marks end
R1 = printer driver number
This SWI will return the numbers of all printer drivers present. Experimentation reveals that the last valid R1 occurs with R0 <> 0; when R0 = 0 on exit R1 is garbage.
See PRM 3, page 644.
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