Chase H.Q.: Routine at 924D

924D: Draws tunnel lights (and possibly other bitmaps).

Input
B	Offset added to $E6xx address. Routine skipped if it's >= 16.

draw_tunnel_light_left

924D

LD HL,$9279

HL = $9279

9250

JR draw_tunnel_light_left_0

draw_tunnel_light_right

9252

LD HL,$92E2

HL = $92E2

draw_tunnel_light_left_0

9255

LD A,B

Return if B >= 16

9256

CP $10

9258

RET NC

9259

PUSH HL

Push return address

925A

LD A,($A23F)

A = fast_counter & $E0

925D

AND $E0

Reduces A by 31.25%

925F

LD L,A

L = A

9260

RRC L

L >>= 2

9262

RRC L

9264

SUB L

A -= L

9265

RRC L

L >>= 2

9267

RRC L

9269

SUB L

A -= L

926A

ADD A,B

A += B -- B was passed in

926B

LD L,A

L = A

926C

LD H,$E6

H = $E6 -- $E6xx data

926E

LD A,(HL)

A = *HL

926F

LD C,A

A = (A>>2) - A

9270

SRL C

9272

SRL C

9274

SUB C

9275

NEG

9277

RET

Return via earlier PUSH