Routines
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B772: Read Dictionary High Nibble
Used by the routine at ProcessLocationDisplay.
Reads the high nibble of the dictionary byte at the token's index.
Input
D Character code
Output
A Attribute value (bits 4-7)
ReadDictionaryHighNibble B772 LD HL,$5DBF Take the dictionary index.
B775 LD A,D
B776 AND %00001111 Keep the dictionary page (the low nibble of the token's high byte) as the high byte of the index.
B778 LD D,A Store the result in the high byte of the source.
B779 ADD HL,DE Add the token offset in DE to the dictionary base.
B77A LD A,(HL) Read the dictionary byte this index points at.
B77B AND %11110000 Keep the high nibble of the dictionary byte, which is the attribute value.
B77D RET Return.
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