Prev: 96A2 Up: Map Next: 96DE
96C9: Check whether ENTER, 0 or the fire button is being pressed
Used by the routine at 96A2. Returns with the zero flag reset if ENTER, 0 or the fire button on the joystick is being pressed.
96C9 LD A,($85CE) Collect the Kempston joystick indicator from 85CE
96CC OR A Is the joystick connected?
96CD JR Z,$96D4 Jump if not
96CF IN A,($1F) Collect input from the joystick
96D1 BIT 4,A Is the fire button being pressed?
96D3 RET NZ Return (with the zero flag reset) if so
96D4 LD BC,$AFFE Read keys H-J-K-L-ENTER and 6-7-8-9-0
96D7 IN A,(C)
96D9 AND $01 Keep only bit 0 of the result (ENTER, 0)
96DB CP $01 Reset the zero flag if ENTER or 0 is being pressed
96DD RET
Prev: 96A2 Up: Map Next: 96DE