Skool Daze: Routine at F4FA

F4FA: Open the lip of the speech bubble

Used by the routine at 734E. Removes the solid line above the lip of the speech bubble, thus 'opening' it.

Input
DE	Coordinates of the speech bubble lip

F4FA

LD A,E

UDG references 0xF8-0xFF correspond to the 8 UDGs that make up the bottom half of the speech bubble; set E to the reference of the UDG that is above the lip

F4FB

AND $07

F4FD

ADD A,$F8

F4FF

LD E,A

F500

LD C,$03

We need to adjust the UDGs for each third of the skool

F502

LD H,$7F

F504

LD B,$08

8 UDGs make up the bottom half of the speech bubble

F506

LD A,H

Point HL at the bottom pixel row of the UDG for the bottom-left corner of the speech bubble

F507

ADD A,B

F508

LD H,A

F509

LD A,E

F50A

LD L,$F8

F50C

LD (HL),$7E

Open the bottom edge (0x81=10000001) of this speech bubble UDG if the lip is underneath, or close it (0x7E=01111110) otherwise

F50E

CP L

F50F

JR NZ,$F513

F511

LD (HL),$81

F513

INC L

Move HL to the next UDG along the bottom of the speech bubble

F514

DJNZ $F50C

Jump back until the lip is open and the others are closed

F516

DEC C

Next third of the skool

F517

JR NZ,$F504

Jump back until the UDGs for each third of the skool have been modified

F519

JP $72D2

Update the SRB for the middle 6 UDG columns of the bubble