=> R0 = 70 (&46)
R1 = country number, or 127 to read
<= R0 = preserved
R1 = 0 if invalid country number passed
country number before being overwritten
R2 corrupted
This call reads or writes the country number used by the international module. This value can also be read with OS_Byte 240.
See PRM 3, page 771
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