Chuckie Egg: Routine at A07B

A07B: Invalidate a lift

Used by the routine at A014.

Input
HL	Screen position to invalidate

A07B

PUSH HL

A07C

DEC HL

A07D

LD (HL),$00

A07F

INC HL

A080

INC HL

A081

INC HL

A082

LD A,L

A083

AND $1F

A085

JR Z,$A089

A087

LD (HL),$00

A089

POP HL

A08A

LD B,$04

A08C

LD (HL),C

A08D

INC L

A08E

LD (HL),C

A08F

DEC L

A090

CALL $A096

A093

DJNZ $A08C

A095

RET

A096

INC H

A097

LD A,H

A098

AND $07

A09A

RET NZ

A09B

LD A,H

A09C

SUB $08

A09E

LD H,A

A09F

LD A,L

A0A0

ADD A,$20

A0A2

LD L,A

A0A3

RET NC

A0A4

LD A,H

A0A5

ADD A,$08

A0A7

LD H,A

A0A8

RET