Routines
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62986: Print Character
Used by the routines at JumpTable_PrintCharacter, Draw_Box, Draw_StatusIcons, Draw_StatusIcons_Branch, Print_Message, Print_Sprite, Draw_Entity and Fill_Tiles.
Prints one character using *CHARS.
Input
A Character to print
Print_Character 62986 PUSH AF Stash the character and IX on the stack.
62987 PUSH IX
62989 EXX Switch to the shadow registers.
62990 LD L,A HL=the character code*8.
62991 LD H,0
62993 ADD HL,HL
62994 ADD HL,HL
62995 ADD HL,HL
62996 LD DE,(23606) HL=*CHARS+HL.
63000 ADD HL,DE
63001 LD DE,(23684) Advance *DF_CC and leave DE on the cell just claimed.
63005 INC DE
63006 LD (23684),DE
63010 DEC DE
Copy the eight pixel rows into the screen buffer.
63011 LD B,8 Set the pixel-row counter to 8.
Print_Character_Target 63013 LD A,(HL) Copy one pixel row and move down one screen line.
63014 LD (DE),A
63015 INC D
63016 INC HL
63017 DJNZ Print_Character_Target Decrease the row counter and loop back to Print_Character_Target until all 8 rows are written.
Write *ATTR_T into the matching attribute cell.
63019 LD BC,(23688) Decrease the print column in *S_POSN.
63023 DEC C
63024 LD (23688),BC
63028 EX DE,HL Point HL at the matching attribute cell.
63029 DEC H
63030 LD A,H
63031 RRCA
63032 RRCA
63033 RRCA
63034 AND %00000011 Keep only bits 0-1 of the display-file high byte.
63036 OR %01011000 Set the attribute-file bit.
63038 LD H,A Merge the attribute-file high byte.
63039 LD A,(23697) Jump to Print_Character_Continue if *MASK_T is set.
63042 OR A
63043 JR NZ,Print_Character_Continue
63045 LD A,(23695) Write *ATTR_T to that attribute cell.
63048 LD (HL),A
63049 EXX Switch back.
63050 POP IX Restore IX and the character from the stack.
63052 POP AF
63053 RET Return.
Print_Character_Continue 63054 PUSH HL Merge the existing attribute through the mask.
63055 AND (HL)
63056 LD (HL),A
63057 LD HL,23695 Keep the paper bits from *ATTR_T.
63060 LD A,(23697)
63063 XOR %11111111 Invert the mask.
63065 AND (HL) Merge the ink bits and write the attribute.
63066 POP HL
63067 OR (HL)
63068 LD (HL),A
63069 EXX Switch back.
63070 POP IX Restore IX and the character from the stack.
63072 POP AF
63073 RET Return.
View the equivalent code in Booty.
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