Routines
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46783: Handler: Controls Keyboard
Used by the routine at Handler_Controls.
Input
E Control response
"Left" is handled by a different port to the other control keys.
Handler_Controls_Keyboard 46783 LD BC,63486 Read from the keyboard;
Port Number Bit
0 1 2 3 4
247 1 2 3 4 5
46786 IN A,(C)
Handles "left" action.
46788 LD E,16 E=16.
46790 BIT 4,A Return if "5" (left) was pressed.
46792 RET Z
Handle "right", "down", "up" and "fire".
46793 LD BC,61438 Read from the keyboard;
Port Number Bit
0 1 2 3 4
239 0 9 8 7 6
46796 IN A,(C)
Handles "right" action.
46798 LD E,0 E=0.
46800 BIT 2,A Return if "8" (right) was pressed.
46802 RET Z
Handles "down" action.
46803 LD E,8 E=8.
46805 BIT 4,A Return if "6" (down) was pressed.
46807 RET Z
Handles "up" action.
46808 LD E,24 E=24.
46810 BIT 3,A Return if "7" (up) was pressed.
46812 RET Z
Handles "fire" action.
46813 LD E,128 E=128.
46815 BIT 0,A Return if "0" (fire) was pressed.
46817 RET Z
Handle no action.
46818 LD E,192 E=192.
46820 RET Return.
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