Routines
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D54C: Set every attribute to bright yellow on black
Used by the routine at clear_scrn.
$46 is BRIGHT, black paper, yellow ink: the colour of the menu and the status line.
clr_attribute_memory D54C LD HL,$5800
D54F LD BC,$0300
D552 LD E,$46
D554 JR clr_byte
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