=> R0 = 71 (&47)
R1 = 0-126 set alphabet number
127 read alphabet number
128-254 set keyboard number as R1 - 128
255 read keyboard number
<= R0 = preserved
R1 = 0 if invalid alphabet or keyboard number passed
or country/keyboard number before being overwritten
R2 corrupted
This call reads or writes the alphabet or keyboard number used by the international module. Although keyboard numbers are passed in with 128 added, they are returned as the actual value.
See PRM 3, page 772
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