Routines
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7427: Update the SRB for the speech bubble
Used by the routines at 734E (when printing the speech bubble) and 7432 (when removing the speech bubble). Sets the bits in the screen refresh buffer (SRB) that correspond to the speech bubble, so that they are refreshed when the display is updated.
Input
DE SRB byte address
7427 LD A,$FF Set all bits in this SRB byte, indicating that 8 squares in a row (the bottom half of the bubble) need refreshing
7429 LD (DE),A
742A LD A,E Point DE at the SRB byte corresponding to the next row up
742B SUB $04
742D LD E,A
742E LD A,$FF Set all bits in this SRB byte, indicating that 8 squares in a row (the top half of the bubble) need refreshing
7430 LD (DE),A
7431 RET
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