Routines
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15E6: THE 'INPUT-AD' SUBROUTINE
Used by the routines at WAIT_KEY and read_in.
The registers are saved and HL made to point to the input address.
INPUT_AD 15E6 EXX Save the registers.
15E7 PUSH HL
15E8 LD HL,($5C51) Fetch the base address for the current channel information (CURCHL).
15EB INC HL Step past the output address.
15EC INC HL
15ED JR CALL_SUB Jump forward.
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