| Chase H.Q. | Routines |
| Prev: 852A | Up: Map | Next: 85E4 |
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Sets up the stage data, starts a reverse transition, clears the playfield and starts the chatter that describes this stage's target. The reveal counter in reveal_perp_car is reset so that the perp's car is uncovered a row at a time. The loop at run_pregame_screen_loop then runs until the chatter has finished or fire is pressed.
Used by the routine at main_loop.
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| run_pregame_screen | 858C | LD HL,$5D1D | Load address of stage_set_up_data | |
| 858F | CALL set_up_stage | Call set_up_stage | ||
| 8592 | LD A,$F8 | Reverse transition | ||
| 8594 | LD ($A220),A | Set dont_draw_screen_attrs to a non-zero value | ||
| 8597 | CALL setup_transition | Call setup_transition | ||
| 859A | CALL set_playfield_attrs | Call set_playfield_attrs | ||
| 859D | XOR A | Reset the counter in reveal_perp_car that reveals the perp's car | ||
| 859E | LD ($85EB),A | |||
| 85A1 | DEC A | Set chatter priority to $FF | ||
| 85A2 | LD HL,($5D04) | Load Nancy's report for this level | ||
| 85A5 | CALL start_chatter | Call start_chatter (priority $FF) | ||
| run_pregame_screen_loop | 85A8 | CALL draw_pregame | Call draw_pregame | |
| 85AB | CALL drive_chatter | Call drive_chatter | ||
| 85AE | CALL reveal_perp_car | Call reveal_perp_car | ||
| 85B1 | CALL animate_meters | Call animate_meters | ||
| 85B4 | CALL transition | Call transition | ||
| 85B7 | CALL send_playfield | Call send_playfield | ||
| 85BA | LD A,($A231) | Loop to run_pregame_screen_loop while transition_control is non-zero | ||
| 85BD | AND A | |||
| 85BE | JR NZ,run_pregame_screen_loop | |||
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transition_control is now zero.
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| 85C0 | LD A,($963D) | Return if chatter_state is idle (zero) | ||
| 85C3 | AND A | |||
| 85C4 | RET Z | |||
| 85C5 | CP $03 | Jump to rps_start_game if chatter_state is stopping (>= 3) | ||
| 85C7 | JR NC,rps_start_game | |||
| 85C9 | CALL keyscan | Call keyscan | ||
| 85CC | AND $10 | Loop to run_pregame_screen_loop unless fire was hit | ||
| 85CE | JR Z,run_pregame_screen_loop | |||
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Fire was hit.
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| 85D0 | CALL drive_chatter_stop | Call drive_chatter_stop | ||
| 85D3 | JP play_start_noise | Exit via play_start_noise (will RET for us) | ||
| rps_start_game | 85D6 | LD A,$08 | Forward transition | |
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We can only arrive here if no carry... so why the conditional CALL?
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| 85D8 | CALL NC,setup_transition | If no carry (A was >= 3) call setup_transition | ||
| 85DB | JR run_pregame_screen_loop | Loop to run_pregame_screen_loop | ||
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Since nothing can arrive here this can only be dead code.
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| rps_dead_code | 85DD | LD A,($A231) | Loop to run_pregame_screen_loop if transition_control is non-zero | |
| 85E0 | AND A | |||
| 85E1 | JR NZ,run_pregame_screen_loop | |||
| 85E3 | RET | Return | ||
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