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B1E1: Fill Message Attributes
Used by the routine at DrawGameScreen.
Fills the attributes of the message area at the bottom of the screen, which is 18 characters wide and 06 characters tall and starts at column 00 of row 12, with a single attribute.
Input
A Attribute
FillMessageAttributes B1E1 LD HL,$5A40 Point HL at the first attribute of row 12.
B1E4 LD DE,$0008 There are 08 attributes between the end of one row and the start of the next.
B1E7 LD BC,$1806 The area is 18 columns wide (B) and 06 rows tall (C).
B1EA JR FillAttributes_Row Fill the area using FillAttributes_Row.
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