Routines
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8D5F: Return the current screen address
Used by the routine at 8B90.
Input
HL On exit, holds the screen address for the current location.
8D5F LD A,($5C7C) Get the Y co-ordinate.
8D62 SUB $10 Convert it to an offset in the screen address buffer.
8D64 LD L,A
8D65 LD H,$00
8D67 ADD HL,HL
8D68 LD DE,$EA60
8D6B ADD HL,DE
8D6C LD A,(HL) Put the screen address in HL.
8D6D INC HL
8D6E LD H,(HL)
8D6F LD L,A
8D70 LD D,$00 Initialise D to add the X co-ordinate.
8D72 LD A,($5C7B) Get the X co-ordinate.
8D75 AND $F8 Convert to a screen offset and store it in E.
8D77 RRCA
8D78 RRCA
8D79 RRCA
8D7A LD E,A
8D7B ADD HL,DE Put the screen address in HL and return.
8D7C RET
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