Chase H.Q.: Routine at F3E2

F3E2: Replay the four 4K windows at $C000 through the engine sound routine

Not a paging routine, despite the label and the call sites' comments. It walks four 4096-byte windows from $C000 up. Each window is copied down to $B000, setup_engine_sfx is entered at $8209 with the engine speed set up, the window is replayed a byte at a time by the LDI loop at f3fd_loop with a write back to the source, the relocated reset_paging_128k at $8208 restores the pager, and the window is copied back from $B000.
page_128k	F3E2	LD HL,$C000	HL = $C000
	F3E5	LD B,$04	4 iterations
	F3E7	LD E,L	E = 0
f3e8_loop	F3E8	PUSH BC	Preserve iterations
	F3E9	LD D,$B0	DE = $B000
	F3EB	LD BC,$1000	4096 bytes
	F3EE	PUSH BC	Preserve
	F3EF	PUSH HL	Preserve
	F3F0	LDIR	Copy
	F3F2	LD A,$03	A = 3
	F3F4	CALL setup_engine_sfx_48k_0	Jump into setup_engine_sfx with engine speed setup
	F3F7	POP HL	Retrieve from stack
	F3F8	POP BC
	F3F9	PUSH BC
	F3FA	PUSH HL
	F3FB	LD D,$B0	DE = $B000
f3fd_loop	F3FD	LD A,(DE)	A = *DE
	F3FE	LDI	Transfer a byte
	F400	DEC HL	HL[-1] = A
	F401	LD (HL),A
	F402	INC HL
	F403	JP PE,$81F1	Loop if (parity even) to f3fd_loop
	F406	CALL $8208	Call relocated reset_paging_128k
	F409	POP DE	Restore
	F40A	POP BC	Restore
	F40B	LD H,$B0	HL = $B000
	F40D	LDIR	Copy
	F40F	LD H,D	H = D
	F410	POP BC	Restore iterations
	F411	DJNZ f3e8_loop	Loop to f3e8_loop
	F413	RET	Return