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Routines |
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Used by the routine at 27762.
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| 28785 | INC HL | Advance data pointer by three bytes... | ||
| 28786 | INC HL | ... | ||
| 28787 | INC HL | ... | ||
| 28788 | PUSH HL | Transfer current position in room layout data from HL to IX... | ||
| 28789 | POP IX | ... | ||
| 28791 | LD L,(IX+0) | Load HL with y-coordinate (pixels)... | ||
| 28794 | LD H,0 | ... | ||
| 28796 | ADD HL,HL | ...and double | ||
| 28797 | LD BC,26240 | Point BC at table of display file addresses of start of each pixel row... | ||
| 28800 | ADD HL,BC | ...and add doubled y-coordinate as offset in HL | ||
| 28801 | CALL 55735 | Load address corresponding to start of pixel row at this coordinate into HL | ||
| 28804 | INC IX | Advance layout data pointer to next byte | ||
| 28806 | LD C,(IX+0) | Load BC with x-coordinate of start of line (characters)... | ||
| 28809 | LD B,0 | ... | ||
| 28811 | ADD HL,BC | ...and add to HL as offset | ||
| 28812 | INC IX | Advance layout data pointer to next byte | ||
| 28814 | LD A,(IX+0) | Load A with x-coordinate of end of line (characters) | ||
| 28817 | SUB C | Subtract start coordinate from end coordinate and add one to get width... | ||
| 28818 | INC A | ... | ||
| 28819 | LD B,A | ...and load into B | ||
| 28820 | LD A,255 | Load A with 255 (i.e. all bits set) | ||
| 28822 | LD (HL),A | Write a row of eight set pixels to the display file... | ||
| 28823 | INC HL | ...and advance to next character to the right | ||
| 28824 | DJNZ 28822 | Decrease B (remaining number of character blocks to draw to) and loop back to 28822 | ||
| 28826 | PUSH IX | Transfer current position in room layout data from IX to HL... | ||
| 28828 | POP HL | ... | ||
| 28829 | INC HL | Advance room layout data pointer to next instruction in layout data | ||
| 28830 | JP 27894 | Jump back to 27894 for next byte of room layout data | ||
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