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Routines |
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Used by the routine at 62700.
Iterates over the 24 three-byte entries in the sprite table at 62808 (Y pixel row at +0 X byte column at +1 attribute byte at +2), calling XorBlitSprite once per entry to draw each sprite in its initial position. Called once during attract-mode setup at 62700 before the animation loop begins.
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| DrawIntroSprites | 63548 | LD B,24 | B=24 (loop counter: 36 sprite entries). | |
| 63550 | LD HL,62808 | HL=62808 (attribute byte position of the first entry). | ||
| DrawIntroSprites_Loop | 63553 | LD A,(HL) | A=attribute byte from the current entry. | |
| 63554 | EXX | Switch to the shadow registers. | ||
| 63555 | LD E,A | E=attribute byte (passed to XorBlitSprite as the draw-mode attribute). | ||
| 63556 | EXX | Switch back to the normal registers. | ||
| 63557 | PUSH BC | Stash BC and HL on the stack. | ||
| 63558 | PUSH HL | |||
| 63559 | DEC HL | Back HL two bytes to the Y pixel row (start of entry). | ||
| 63560 | DEC HL | |||
| 63561 | CALL XorBlitSprite | Call XorBlitSprite to draw the sprite at the position held in the current entry. | ||
| 63564 | POP HL | Restore HL and BC from the stack. | ||
| 63565 | POP BC | |||
| 63566 | INC HL | Advance HL by three to the attribute byte of the next entry. | ||
| 63567 | INC HL | |||
| 63568 | INC HL | |||
| 63569 | DJNZ DrawIntroSprites_Loop | Decrease counter and loop back to DrawIntroSprites_Loop. | ||
| 63571 | RET | Return. | ||
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