B0DC: Flash the screen
| B0DC |
PUSH BC |
| B0DD |
RL C |
| B0DF |
LD A,($A42D) |
| B0E2 |
RRCA |
| B0E3 |
RRCA |
| B0E4 |
RRCA |
| B0E5 |
AND $1F |
| B0E7 |
LD E,A |
| B0E8 |
LD D,$00 |
| B0EA |
LD HL,$5080 |
| B0ED |
ADD HL,DE |
| B0EE |
LD A,$20 |
| B0F0 |
SUB E |
| B0F1 |
CP $11 |
| B0F3 |
JR C,$B0F7 |
| B0F5 |
LD A,$11 |
| B0F7 |
LD D,A |
| B0F8 |
LD E,L |
| B0F9 |
LD A,($A421) |
| B0FC |
LD B,D |
| B0FD |
LD L,E |
| B0FE |
AND A |
| B0FF |
BIT 0,C |
| B101 |
JR Z,$B10B |
| B103 |
BIT 0,H |
| B105 |
JR NZ,$B10B |
| B107 |
XOR $10 |
| B109 |
OUT ($FE),A |
| B10B |
RR (HL) |
| B10D |
INC L |
| B10E |
DJNZ $B10B |
| B110 |
INC H |
| B111 |
BIT 3,H |
| B113 |
JR Z,$B0FC |
| B115 |
POP BC |
| B116 |
LD HL,$A42D |
| B119 |
LD A,(HL) |
| B11A |
INC A |
| B11B |
LD (HL),A |
| B11C |
LD HL,$A42B |
| B11F |
CP (HL) |
| B120 |
RET C |
| B121 |
LD (HL),A |
| B122 |
CP $FF |
| B124 |
JR NZ,$B12B |
| B126 |
XOR A |
| B127 |
POP HL |
| B128 |
LD A,$80 |
| B12A |
RET |
| B12B |
INC A |
| B12C |
AND $07 |
| B12E |
RET NZ |
| B12F |
LD A,($A436) |
| B132 |
SRL A |
| B134 |
SRL A |
| B136 |
LD HL,$A42F |
| B139 |
ADD A,(HL) |
| B13A |
JR NC,$B13E |
| B13C |
LD A,$FF |
| B13E |
LD (HL),A |
| B13F |
RET |