Routines
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52770: Pause Game
Used by the routine at RunGame.
Pauses the game if CAPS SHIFT or SPACE is pressed on its own. The game waits for the key to be let go of, then for it to be pressed again and let go of again. There is a beep for the start and for the end of the pause.
Return unless CAPS SHIFT or SPACE is pressed on its own.
PauseGame 52770 LD A,126 Read from the keyboard;
Port Number Bit
0 1 2 3 4
126 SHIFT / SPACE Z / SYM X / M C / N V / B
52772 CALL ReadKeyboardPort
52775 BIT 0,A Return if bit 0 is not set.
52777 RET Z
52778 AND %00011110 Keep bits 1 to 4.
52780 RET NZ Return if any of them is set.
Wait for the key to be let go of, then pressed and let go of again.
PauseGame_Release 52781 LD A,126 Read the keys.
52783 CALL ReadKeyboardPort
52786 BIT 0,A Jump to PauseGame_Release if bit 0 is set.
52788 JR NZ,PauseGame_Release
52790 CALL PlayMiddleBeep Call PlayMiddleBeep.
PauseGame_Wait 52793 LD A,126 Read the keys.
52795 CALL ReadKeyboardPort
52798 BIT 0,A Jump to PauseGame_Wait if bit 0 is not set.
52800 JR Z,PauseGame_Wait
PauseGame_Finish 52802 LD A,126 Read the keys.
52804 CALL ReadKeyboardPort
52807 BIT 0,A Jump to PauseGame_Finish if bit 0 is set.
52809 JR NZ,PauseGame_Finish
52811 JP PlayMiddleBeep Jump to PlayMiddleBeep.
View the equivalent code in;
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