=> R0 = 216 (&D8)
R1 = EOR value
R2 = AND value
<= R0 preserved
R1 = previous length
R2 = paged mode line count (see OS_Byte 217)
This call reads or sets the count of characters left in the currently active function key definition. If this count is 0, then no current function key string is being read. If this count is non-zero then OS_ReadC is reading from a function key definition rather than the current input stream.
Writing a 0 length will cancel the current function key expansion - the effect of writing any other value is indeterminate.
See PRM 1, page 885
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