Routines
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55334: Read Kempston
Used by the routines at Initialise_Game, Game_Loop, Controls_Kempston and Controls_Kempston_Climb.
Reads the Kempston port twice and returns with the Z flag set if the two reads match.
Output
A Kempston port value
F Z flag set if the two reads match
Read_Kempston 55334 IN A,(31) Read from the Kempston joystick port twice.
55336 LD E,A
55337 IN A,(31)
55339 CP E Set the Z flag if the two reads match.
55340 RET Return.
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