James Malcolm

Neurosurgery resident in Atlanta.

SDR8 Routine

z80 » Graphics 

    

  1. SDR_8x8:

  2. 	ld a,63

  3. 	sub c

  4. 	ld c,a

  5. 	push hl

  6. 	call FindPixel

  7. 	ld c,8

  8. 	add a,a

  9. 	dec a

  10. 	ld e,a

  11. 	ld a,b

  12. 	and %00000111

  13. 	inc a

  14. 	ld b,a

  15. SDR_8x8_NewRow:

  16. 	ex (sp),hl

  17. 	ld a,(hl)

  18. 	inc hl

  19. 	ex (sp),hl

  20. 	push bc

  21. 	rlca

  22. SDR_8x8_PrepByte:

  23. 	rrca

  24. 	djnz SDR_8x8_PrepByte

  25. 	ld d,a

  26. 	and e

  27. 	or (hl)

  28. 	ld (hl),a

  29. 	inc hl

  30. 	ld a,e

  31. 	cpl

  32. 	and d

  33. 	or (hl)

  34. 	ld (hl),a

  35. 	ld c,$10-1

  36. 	add hl,bc

  37. 	pop bc

  38. 	dec c

  39. 	jr nz,SDR_8x8_NewRow

  40. 	pop hl

  41. 	ret

More from z80 » Graphics
Find a Pixel // Grayscale // Pixel Manipulation // The Screen // Sprites // SDR8 Routine // Tile Maps // TileGen Routine