Routines
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51141: Pause game routine - check if 'resume game' key is pressed
Used by the routine at 51043.
While the game is paused, check if the player is pressing 'O' to resume the game
51141 LD BC,57342 Keyboard port address for keys Y, U, I, O, P
51144 IN A,(C) Check this half-row of the keyboard
51146 OR %11111101 For the 'O key we're interested in the second lowest bit (bit 1), so set all the other bits to 1
51148 CP %11111111 If bit 1 is set to 1, all the bits will be set to 1, indicating the 'O key isn't being pressed.
51150 JR Z,51043 If this is the case, return to the start of the pause routine, play the music and keep checking the keyboard.
Otherwise, continue to the next routine to resume the game, starting at the main game loop.
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