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47942: Wait for current key to be released and another to be pressed, storing in A
Used by the routines at 34438, 47893 and 47955.
47942 CALL 47788 Read keyboard and load character of pressed key into A
47945 OR A If a key is pressed...
47946 JR NZ,47942 ...then loop back to 47942
47948 CALL 47788 Read keyboard and load character of pressed key into A
47951 OR A If a key is not pressed...
47952 JR Z,47948 ...then loop back to 47948
47954 RET Return
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