Routines
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64468: Get Keypress
Used by the routines at ChangeControls, UserDefinedKeys and PressAnyKey_Pause.
GetKeypress 64468 XOR A A=0.
64469 IN A,(254) Read from the keyboard;
Port Number Bit
0 1 2 3 4
254 SHIFT Z X C V
64471 CPL Invert the bits in A.
64472 AND %00011111 Keep only bits 0-4.
64474 RET Return.
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