=> R0 = 219 (&DB)
R1 = EOR value
R2 = AND value
<= R0 preserved
R1 = previous value
R2 corrupted
This call reads or sets the character that the tab key produces. If 128 <= value <= 255 then the character inserted in the buffer is modified by shift and control:
Key Modification
Shift value EOR &10
Control value EOR &20
See PRM 1, page 887
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