Chase H.Q.: Routine at 83CD

This is the true start and main loop of the game. It's called once the memory map is set up. It builds a table of 256 flipped bytes at $EF00 then starts attract mode. When the player causes attract mode to yield, the overtaking bonus, the score and the retry count are reset as are the wanted stage number and the number of credits. The main loop is then called to run the game. Then when the main loop yields it will start the 128K animated title screen, or just loop if we're running on a 48K machine.

Used by the routine at E839.

This is the true start and main loop of the game. It's called once the memory map is set up. It builds a table of 256 flipped bytes at $EF00 then starts attract mode. When the player causes attract mode to yield, the overtaking bonus, the score and the retry count are reset as are the wanted stage number and the number of credits. The main loop is then called to run the game. Then when the main loop yields it will start the 128K animated title screen, or just loop if we're running on a 48K machine. Used by the routine at E839.
Build a table of flipped bytes at $EF00.
bootstrap	83CD	LD HL,$EF00	Point HL at $EF00
bs_flip_table_loop	83D0	LD B,$08	8 iterations
	83D2	LD A,L	A is the index into the table
bs_flip_byte_loop	83D3	RLCA	Shift a bit out of A leftwards and into C rightwards
	83D4	RR C	Shift a bit out of A leftwards and into C rightwards
	83D6	DJNZ bs_flip_byte_loop	Loop for 8 bits
	83D8	LD (HL),C	Write C out and advance
	83D9	INC L	Write C out and advance
	83DA	JR NZ,bs_flip_table_loop	Loop for 256 iterations (until L overflows)
Start attract mode.
	83DC	CALL attract_mode_hook	Call attract_mode_hook
When attract mode yields then we set up the game.
	83DF	XOR A	Reset overtake_bonus
	83E0	LD ($A13C),A	Reset overtake_bonus
Clear score_bcd and retry_count.
	83E3	LD HL,$8002
	83E6	LD B,$05
bs_clear_loop	83E8	LD (HL),A
	83E9	INC HL
	83EA	DJNZ bs_clear_loop
Reset wanted_stage_number and credits.
	83EC	INC A	wanted_stage_number = 1
	83ED	LD (HL),A	wanted_stage_number = 1
	83EE	INC A	credits = 2
	83EF	LD ($A13D),A	credits = 2
	83F2	CALL main_loop	Call the main loop
Call the 128K/bank 3 ?bootstrap routine.
	83F5	LD A,($A139)	Check for 128K mode
	83F8	AND A	Check for 128K mode
	83F9	LD HL,$C003	Entry point for ?bootstrap
	83FC	CALL NZ,$81AA	Call relocated call_bank_3_128k if in 128K mode
	83FF	JR bootstrap	Loop