Routines
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53766: Pause Game
Used by the routine at InitialiseGame.
Pauses the game if CAPS SHIFT or SPACE is pressed on its own. PlayPauseSound is played at the start and at the end. The game carries on when CAPS SHIFT or SPACE is pressed again.
Return unless CAPS SHIFT or SPACE is the only key being pressed.
PauseGame 53766 LD A,126 Read from the keyboard;
Port Number Bit
0 1 2 3 4
126 CAPS SHIFT or SPACE Z or SYMBOL SHIFT X or M C or N V or B
53768 CALL ReadKeyboardPort
53771 BIT 0,A Return if neither CAPS SHIFT nor SPACE is pressed.
53773 RET Z
53774 AND %00011110 Keep the bits for the other keys.
53776 RET NZ Return if any of them is pressed.
Play the pause sound.
53777 CALL PlayPauseSound Call PlayPauseSound.
Wait for the key to be released.
PauseGame_Release 53780 LD A,126 Read the keys, and jump to PauseGame_Release while CAPS SHIFT or SPACE is pressed.
53782 CALL ReadKeyboardPort
53785 BIT 0,A
53787 JR NZ,PauseGame_Release
Wait for a key to be pressed.
PauseGame_Press 53789 LD A,126 Read the keys, and jump to PauseGame_Press until CAPS SHIFT or SPACE is pressed.
53791 CALL ReadKeyboardPort
53794 BIT 0,A
53796 JR Z,PauseGame_Press
Play the pause sound.
53798 CALL PlayPauseSound Call PlayPauseSound.
Wait for the key to be released.
PauseGame_ReleaseAgain 53801 LD A,126 Read the keys, and jump to PauseGame_ReleaseAgain while CAPS SHIFT or SPACE is pressed.
53803 CALL ReadKeyboardPort
53806 BIT 0,A
53808 JR NZ,PauseGame_ReleaseAgain
53810 RET Return.
View the equivalent code in;
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