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Routines |
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Used by the routine at PrintDoubleHeightCharacter.
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| PrintHalfDoubleHeightTextCharacter | DB02 | PUSH HL | Stash HL and BC on the stack. | |||||||
| DB03 | PUSH BC | |||||||||
| DB04 | LD A,($6D96) | Load StoredAttribute into A. | ||||||||
| DB07 | LD (HL),A | Write this to attribute buffer. | ||||||||
| DB08 | LD A,H | Multiply the most significant byte (MSB) of the attribute buffer address by 08 to put it on the same scale as the MSB of the display buffer address MSB (see notes). | ||||||||
| DB09 | ADD A,A | |||||||||
| DB0A | ADD A,A | |||||||||
| DB0B | ADD A,A | |||||||||
| DB0C | AND %01011011 | Drop the most significant bit to point to the correct location in the display buffer. | ||||||||
| DB0E | LD H,A | Load back into HL (L is unaffected, as it should be). | ||||||||
| DB0F | LD B,$04 | Set B to 04 (loop counter). | ||||||||
| PrintHalfDoubleHeightTextCharacter_Loop | DB11 | LD A,(DE) | Load a byte from the graphic data into C. | |||||||
| DB12 | LD C,A | |||||||||
| DB13 | SRL C | Shift bitmap data left one pixel in C. | ||||||||
| DB15 | OR C | Merge this into bitmap data already in A to give a "bold" typeface appearance. | ||||||||
| DB16 | AND %01111111 | Drop the leftmost bit to prevent one character touching the next (space between letters). | ||||||||
| DB18 | LD (HL),A | Load the bitmap data into two consecutive rows to provide double-height (02 chars) text. | ||||||||
| DB19 | INC H | |||||||||
| DB1A | LD (HL),A | |||||||||
| DB1B | INC H | |||||||||
| DB1C | INC DE | Advance to next byte of graphic data. | ||||||||
| DB1D | DJNZ PrintHalfDoubleHeightTextCharacter_Loop | Loop back to PrintHalfDoubleHeightTextCharacter_Loop to repeat for next row of graphic data. | ||||||||
| DB1F | POP BC | Restore BC and HL from the stack. | ||||||||
| DB20 | POP HL | |||||||||
| DB21 | RET | Return. | ||||||||
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