Routines
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EE0B: Calculate Attribute Cell Address
Used by the routines at Initialise_Display_And_Border and Adjust_Score_Field_Cursor.
Looks up a character index in the word table at 4600 to find its pixel row address, then converts that address to the corresponding attribute cell in the range 5800-5BFF by shifting the screen row right by 3 and combining with 58. Called by Adjust_Score_Field_Cursor to position score entry highlight attributes.
Input
A Character index
Calculate_Attr_Cell_Address EE0B LD H,$46 Look up the character index in the word table at 4600 and load the pixel row address into HL.
EE0D LD L,A
EE0E ADD HL,HL
EE0F LD E,(HL)
EE10 INC HL
EE11 LD D,(HL)
EE12 EX DE,HL
EE13 LD A,H Convert the pixel row address to the attribute cell address in the range 5800-5BFF.
EE14 RRCA
EE15 RRCA
EE16 RRCA
EE17 AND $03
EE19 OR $58
EE1B LD H,A
EE1C RET Return.
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