Routines
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BE56: Find the attribute address for the string
Used by the routine at print_text_single_colour.
In the alternate registers: HL' becomes the attribute address of the first cell. DE' is kept, because display_text_list uses it to walk its colour list.
text_attr_addr BE56 EXX
BE57 POP HL take the position off the stack
BE58 PUSH DE
BE59 CALL calc_attrib_addr
BE5C LD L,E
BE5D LD H,D
BE5E POP DE
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