Routines
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50197: Wait For Keypress
Used by the routines at GameEntryPoint, 43447, 49600 and 49926.
Output
A The ASCII code keypress value
Bit 7 is only set after a key has been pressed.
WaitForKeypress_Loop 50197 CALL GetKeypress Call GetKeypress.
50200 BIT 7,A Jump to back WaitForKeypress_Loop until a key has been pressed.
50202 JR Z,WaitForKeypress_Loop
Strip off the set bit for the response.
50204 AND %01111111 Keep only bits 0-6.
50206 RET Return.
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