Routines
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6910: Convert Screen Buffer Address To Attribute Buffer
Used by the routines at 692C and 6DA8.
ScreenBufferToAttributeBuffer 6910 LD A,H A=H.
6911 SUB $48 A-=48.
6913 SBC A,A A-=A (with carry).
6914 ADD A,$59 A+=59.
6916 LD H,A H=A.
6917 LD A,(HL) A=*HL.
6918 PUSH HL DE'=HL (using the stack).
6919 EXX
691A POP DE
Continue on to ColouriseSprite.
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