Routines
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72D2: Update the SRB for the middle six columns of the speech bubble
 Used by the routines at 7432 and F4FA. Returns with the carry flag set if the speech bubble is off-screen. 72D2 LD DE,(\$7F64) Copy the speech bubble lip coordinates from 7F64 to DE 72D6 LD A,E Now E holds the x-coordinate of the left edge of the speech bubble 72D7 AND \$F8 72D9 LD E,A 72DA LD A,(\$7F00) A=leftmost column of the skool on screen (0-64) 72DD SUB E Is the speech bubble at the far left of the screen? 72DE JR Z,\$72EA Jump if so 72E0 CCF Return with the carry flag set if the speech bubble is off-screen to the left 72E1 RET C 72E2 CP \$E1 Return with the carry flag set if the speech bubble is off-screen to the right 72E4 RET C 72E5 NEG A=1, 2 or 3 (corresponding to the quadrant of the screen containing the speech bubble) 72E7 RRCA 72E8 RRCA 72E9 RRCA 72EA LD E,A E=0-3 (quadrant of the screen containing the speech bubble) 72EB LD A,D Point DE at the byte of the screen refresh buffer corresponding to the top row of the speech bubble 72EC SUB \$97 72EE ADD A,A 72EF ADD A,A 72F0 ADD A,E 72F1 LD E,A 72F2 LD D,\$7F 72F4 LD A,(DE) Set bits 1-6 of this screen refresh buffer byte (so that the part of the screen hidden by the middle 6 UDGs of the top row of the speech bubble will be refreshed) 72F5 OR \$7E 72F7 LD (DE),A 72F8 LD A,E Point DE at the byte of the screen refresh buffer corresponding to the bottom row of the speech bubble 72F9 ADD A,\$04 72FB LD E,A 72FC LD A,(DE) Set bits 1-6 of this screen refresh buffer byte (so that the part of the screen hidden by the middle 6 UDGS of the bottom row of the speech bubble will be refreshed) 72FD OR \$7E 72FF LD (DE),A 7300 RET Return with the carry flag reset
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