Routines
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C415: Wait For Keypress
Used by the routines at GameEntryPoint, A9B7, C1C0 and C306.
Output
A The ASCII code keypress value
Bit 7 is only set after a key has been pressed.
WaitForKeypress_Loop C415 CALL GetKeypress Call GetKeypress.
C418 BIT 7,A Jump to back WaitForKeypress_Loop until a key has been pressed.
C41A JR Z,WaitForKeypress_Loop
Strip off the set bit for the response.
C41C AND %01111111 Keep only bits 0-6.
C41E RET Return.
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