Routines
Prev: 80A9 Up: Map Next: 813A
80E5: Show title screen
Used by the routines at 8155 and 8184.
The routine returns when the user starts a game.
80E5 CALL $B8ED Clear the screen.
80E8 CALL $B471 Initialize the theme tune data.
80EB LD HL,$7DC6 Print the title page text. (7DC6)
80EE LD DE,$0003
80F1 CALL $B8C4
80F4 LD HL,$7E37 Point HL at the "key" text. (7E37)
80F7 LD A,($B2DB) Put the current control mechanism (B2DB) in B.
80FA LD B,A
80FB LD A,$02 Convert this to a location on screen and put it in DE.
80FD SUB B
80FE LD B,A
80FF ADD A,A
8100 ADD A,A
8101 ADD A,A
8102 SUB B
8103 LD D,A
8104 LD E,$03
8106 CALL $B8C4 Print a marker against the selected option.
8109 LD A,$FF Set to no key pressed.
810B LD ($B4E9),A
810E CALL $B482 Play the next note of the theme tune.
8111 LD A,($B55F) Is the tune still playing?
8114 OR A
8115 JR NZ,$8155 If not, start demo mode.
8117 LD A,($B4E9) Get the last key pressed.
811A BIT 0,A Was '1' pressed?
811C JR NZ,$8123 Jump forward if not.
811E CALL $B2DC Select Sinclair control and continue playing the tune.
8121 JR $80EB
8123 BIT 1,A Was '2' pressed?
8125 JR NZ,$812C Jump forward if not.
8127 CALL $B2E2 Select Kempston control and continue playing the tune.
812A JR $80EB
812C BIT 2,A Was '3' pressed?
812E JR NZ,$8135 Jump forward if not.
8130 CALL $B2E8 Select Keyboard control and continue playing the tune.
8133 JR $80EB
8135 BIT 3,A Was '4' pressed?
8137 JR NZ,$8109 Jump back if not to continue playing the tune.
8139 RET Otherwise return to start the game.
Prev: 80A9 Up: Map Next: 813A