Routines
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6E82: Delete the whole input line
Rubs out everything typed so far. While B has bit 7 reset (i.e. at least one character has been typed; see 6DCD), it prints a backspace, puts B back up by one and moves HL back one character.
Called for SYMBOL SHIFT + 0 by the line editor, and by 7240 before it types WAIT for an idle player, so that anything half-typed is thrown away and replaced by WAIT.
Input
HL Current position in the input buffer
B Space left in the buffer
6E82 BIT 7,B Stop when the line is empty
6E84 RET NZ Return if the bit is set
6E85 LD A,$08 Print a backspace
6E87 CALL $7580 Print the character in A
6E8A INC B One more character of space; step back in the buffer
6E8B DEC HL Decrement HL
6E8C JR $6E82 Continue at Delete the whole input line (6E82)
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