Routines
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6A3F: Copy a guard buffer into the temporary location
Used by the routines at 6000, 6337, 651E, 6622, 66A4, 673A and 6907.
Input
B Guard number (1-4)
6A3F LD A,B Copy the guard number (1, 2, 3, 4) to A.
6A40 CP $04 Are we dealing with guard 4?
6A42 JR NZ,$6A49 Jump if not.
6A44 LD HL,$6DE3 Point HL at the buffer for guard 4.
6A47 JR $6A5E
6A49 CP $03 Are we dealing with guard 3?
6A4B JR NZ,$6A52 Jump if not.
6A4D LD HL,$6E0E Point HL at the buffer for guard 3.
6A50 JR $6A5E
6A52 CP $02 Are we dealing with guard 2?
6A54 JR NZ,$6A5B Jump if not.
6A56 LD HL,$6E39 Point HL at the buffer for guard 2.
6A59 JR $6A5E
6A5B LD HL,$6E64 Point HL at the buffer for guard 1.
6A5E LD ($6DB6),HL Save the address of the guard's buffer for later retrieval.
6A61 LD DE,$6DB8 Copy the guard's buffer into the temporary location (6DB8).
6A64 LD BC,$002B
6A67 LDIR
6A69 RET
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