=> R0 = 217 (&D9)
R1 = EOR value
R2 = AND value
<= R0 preserved
R1 = previous count
R2 corrupted
This call reads or sets the count of lines displayed since the last page halt when in paged mode. Usually this call is used to set the count to 0, before requesting user input - OS_ReadLine makes this call automatically.
See PRM 1, page 667
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