Routines
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44109: WaitKeyRelease — wait until no key is pressed anywhere
Used by the routines at 42821, 43610 and 44815.
44109 LD BC,65278 all 8 half-rows must
44112 IN A,(C) read clear
44114 AND 31
44116 XOR 31
44118 JR NZ,44109 something still down: restart
44120 RLC B
44122 JR C,44112
44124 RET
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