Chase H.Q.: Routine at C06E

Reached from check_high_score when the new score beats or ties the table row whose address was pushed there. Shifts the rows below the insertion point down by one (33 bytes each; row 1 needs no shift), writes the score digits, stage code and retry-attempt number into the row, runs a highlight/flash display, then drops into the joystick-driven name-entry loop at name_entry_frame.

Used by the routine at check_high_score.

Reached from check_high_score when the new score beats or ties the table row whose address was pushed there. Shifts the rows below the insertion point down by one (33 bytes each; row 1 needs no shift), writes the score digits, stage code and retry-attempt number into the row, runs a highlight/flash display, then drops into the joystick-driven name-entry loop at name_entry_frame. Used by the routine at check_high_score.
insert_high_score_entry	C06E	LD A,C	A = row counter (1..10, from check_high_score)
	C06F	EX AF,AF'	Bank the row counter
	C070	LD A,C	A = row counter again
	C071	DEC A
	C072	JR Z,ihe_write_row	Row 1 (bottom of the table) -> nothing below to shift
ihe_shift_rows	C074	LD DE,$C54A	DE -> one past the last table row (shift destination)
	C077	LD HL,$C529	HL -> last table row (shift source)
insert_high_score_entry_0	C07A	LD BC,$001A	Shift 26 bytes of the row down into the row below
	C07D	LDDR	Shift 26 bytes of the row down into the row below
	C07F	LD C,$07	then step both pointers back the rest of the 33-byte row stride without copying -- the trailing 7 bytes of each row (2 padding bytes + the row's own 5-char rank suffix, e.g. "2ND " -- see the data at C3AF) are static labels, not player data, so they are simply left untouched by the shift
	C081	AND A
	C082	SBC HL,BC
	C084	EX DE,HL
	C085	SBC HL,BC
	C087	EX DE,HL
	C088	DEC A	One row done
	C089	JR NZ,insert_high_score_entry_0	Loop up through the rows above the insertion point
ihe_write_row	C08B	POP DE	DE -> the row being inserted (address pushed by check_high_score)
	C08C	LD HL,$C55F	HL -> formatted score digit string
	C08F	LD BC,$0008	Write the 8 score digits into the row
	C092	LDIR	Write the 8 score digits into the row
	C094	INC DE	DE += 4
	C095	INC DE
	C096	INC DE
	C097	INC DE
	C098	LD A,($8007)	A = wanted_stage_number
	C09B	LD C,A	C = stage_number * 3 -- index into a 3-byte-per-stage table
	C09C	ADD A,A
	C09D	ADD A,C
	C09E	LD C,A
	C09F	LD HL,$C564	HL -> stage code/name table (3 bytes/stage)
	C0A2	ADD HL,BC	HL -> this stage's entry
	C0A3	LD C,$03	Write the 3-byte stage code into the row
	C0A5	LDIR	Write the 3-byte stage code into the row
	C0A7	EX DE,HL	HL -> row (DE no longer needed for the copy)
	C0A8	LD C,$05	HL += 5
	C0AA	ADD HL,BC	HL += 5
	C0AB	LD A,($8006)	A = retry_count (0/1/2)
	C0AE	ADD A,$31	A = ASCII '1'..'3'
	C0B0	LD (HL),A	Write the attempt-number digit into the row
	C0B1	LD C,$03	HL += 3
	C0B3	ADD HL,BC	HL += 3
	C0B4	LD ($C59C),HL	Remember this position
	C0B7	LD (HL),$2E	Write two static full stops ("..")
	C0B9	INC HL
	C0BA	LD (HL),$2E
	C0BC	INC HL
	C0BD	LD (HL),$AE	A third full stop with bit 7 set, terminating the row's 3-character name field (see C3AF) with placeholder text before the player's initials overwrite it
	C0BF	EX AF,AF'	Restore the row counter (banked at $C06F)
	C0C0	LD ($C2F8),A	Save the row counter
	C0C3	LD B,A	B = row counter
Address = $C401 + (10 - row_counter) * 33: locates this row's entry in a 33-byte-per-row table (screen or attribute positions for the 10-row name-entry table), used below to scroll the display to the new entry. The multiply is done as (10-row)32 (5x ADD A,A, overflow captured in D via RL D) plus one more (10-row) added back in (ADD A,C) -- i.e. x32 + x = x*33.
	C0C4	NEG
	C0C6	ADD A,$0A
	C0C8	LD C,A
	C0C9	ADD A,A
	C0CA	ADD A,A
	C0CB	ADD A,A
	C0CC	ADD A,A
	C0CD	ADD A,A
	C0CE	LD D,$00
	C0D0	RL D
	C0D2	ADD A,C
	C0D3	LD E,A
	C0D4	LD HL,$C401
	C0D7	ADD HL,DE
	C0D8	LD ($C156),HL	Save the computed address
Border-flash colour = $A0 - clamp(7 - row_counter, 0..7) * 16: fades from bright ($A0) for early rows to darker for rows further down the table, giving the flashing highlight a position-dependent brightness.
	C0DB	LD A,$07
	C0DD	SUB B
	C0DE	JR NC,insert_high_score_entry_1
	C0E0	XOR A
insert_high_score_entry_1	C0E1	ADD A,A
	C0E2	ADD A,A
	C0E3	ADD A,A
	C0E4	ADD A,A
	C0E5	LD C,A
	C0E6	LD A,$A0
	C0E8	SUB C
	C0E9	LD ($C13D),A	Save the computed flash colour (read back at $C13C)
	C0EC	CALL clear_playfield_and_attrs	See clear_playfield_and_attrs
Clear/prepare screen buffers for the name-entry display ($C0EF-$C132). Not traced instruction-by-instruction here.
	C0EF	INC L
	C0F0	LD H,$5A
	C0F2	INC E
	C0F3	LD D,H
	C0F4	LD (HL),$47
	C0F6	LD BC,$01FF
	C0F9	LDIR
	C0FB	LD HL,$59E0
	C0FE	LD DE,$5AE0
	C101	XOR A
	C102	LD B,$20
insert_high_score_entry_2	C104	LD (HL),A	Zero two 32-byte blocks at $59E0 and $5AE0 in lockstep
	C105	LD (DE),A
	C106	INC E
	C107	INC L
	C108	DJNZ insert_high_score_entry_2
	C10A	LD DE,$C401
	C10D	LD HL,$C54B
	C110	LD A,$0A	A = 10 (rows)
insert_high_score_entry_3	C112	LDI	Copy 2 bytes per row from the table at $C54B into the row-offset table at $C401 (31-byte stride)
	C114	LDI
	C116	EX DE,HL
	C117	LD BC,$001F
	C11A	ADD HL,BC
	C11B	EX DE,HL
	C11C	DEC A
	C11D	JR NZ,insert_high_score_entry_3
	C11F	LD HL,$C3AF	HL -> C3AF data block
	C122	CALL print_string	Common routine outside this bank
	C125	CALL setup_im2_interrupt_table	See setup_im2_interrupt_table
	C128	LD A,$03
	C12A	CALL titlescr_start_tune	See titlescr_start_tune, called with A=3
	C12D	EI
	C12E	HALT	Wait for the next interrupt
	C12F	XOR A
	C130	LD ($C2F2),A	Clear a flag/self-modified byte at $C2F2
ihe_flash_loop	C133	CALL titlescr_music	See titlescr_music
	C136	CALL scroll_score_rows	See scroll_score_rows
	C139	CALL name_entry_input	See name_entry_input
	C13C	LD A,$A0	Recomputes to a constant $9F every pass, so JR NZ is always taken here -- this loop can only actually end via a side effect inside one of the three CALLs above (e.g. popping this return address), not via this test
	C13E	DEC A
	C13F	LD ($C13D),A
	C142	JR NZ,ihe_flash_loop
	C144	LD A,$C9	$C9 = RET opcode
	C146	LD ($C2F2),A	Self-modify $C2F2 to RET, ending the entry loop
ihe_entry_loop	C149	CALL name_entry_frame	Handle one frame of name entry (see name_entry_frame)
	C14C	CALL name_entry_input	See name_entry_input
	C14F	CALL titlescr_music	See titlescr_music
	C152	JP ihe_entry_loop	Loop -- exits via a side effect inside a callee
This entry point is used by the routine at name_entry_input.
name_entry_frame	C155	LD HL,$C422	HL -> a saved (DE) pair, likely the current cursor/
	C158	LD E,(HL)	letter-selection state
	C159	INC HL
	C15A	LD D,(HL)
	C15B	INC HL
	C15C	EXX	Swap in DE (bank what was the caller's shadow set)
	C15D	PUSH HL	Preserve the caller's shadow BC/DE/HL on the stack, in case redraw_name_frame uses EXX itself
	C15E	PUSH DE
	C15F	PUSH BC
	C160	EXX	Swap back -- main regs include DE (the loaded state)
	C161	CALL redraw_name_frame	See redraw_name_frame (joystick/letter-selection update)
	C164	EXX	Swap to the (now current) shadow set
	C165	POP BC	Restore the caller's shadow BC/DE/HL
	C166	POP DE
	C167	POP HL
	C168	EXX	Swap back to the main set
	C169	RET