S1D5 is the scrolling of Type-B of the SNES-version, so I guess S1D6 is Type-C. Here is a list of how the SNES scrolls scroll:
Type A If placed before X20: Extremely Slow until left side reaches X20, becomes faster, stops when screen reaches 80.
If placed after X20: Moves in faster movement back to X20, then back to 80 and stops then.
Type B Moves until LLSP reaches (6F|6D), moves downwards-left to (5D|7A), moves left to (1D|7A), moves upwards left to (08|62), moves up to (0D|6A)
moves upwards right to (23|3B), moves right to (50|3F)
Type C Moves until LLSP reaches (08|5C), moves upwards right to (24|3B), moves right to (50|3F)
Type D Moves towards lower screen location: (A0|68)
Type E Moves until LLSP reaches (0E|7F), then moves right to (A0|7F)
Type F Moves until LLSP reaches (08|40), then moves downwards right to (70|68), moves downwards left to (66|7F), moves leftwards to (48|7F)
moves upwards left to (42|5B), move rightwards down to (A0|68)
Type G Moves until LLSP reaches (08|6B), moves downwards right to (74|69), moves upwards right to (E0|6F)
Type H Moves until LLSP reaches (08|6B), moves upwards right ot (58|68), moves downwards right very shortly, moves upwards right to (E0|4D)
Type I Moves upwards right to (04|28), then unlocks the screens.
Type J Moves until LLSP reaches (C9|6F), moves downwards left to (A3|7D), moves left to (93|7D), moves upwards left to (84|6D), moves left to (26|6D)
moves downwards left to (08|7D), moves upwards left to (04|6D), then unlocks screens.
Type K If placed before X1F: Scroll until reaches D8
If placed after X1F: Scroll until reaches 1F, then until reaches D8
*Edit*
I don't think THAT they even added auto-scroll sprites. Scroll-Type-A is Sprite S1D4... At least for level 6-8. In Secret 4 and Secret 6 they use S1D4 for the fast scroll, but in 6-8 it's just as slow as in the SNES. Maybe they've tweaked it. But if they did: The hell why?? They have had a few free sprite-IDs left, so why did they need to modify an existing one? That goes up to Type-K, which is Sprite S1DE. In every level they follow a different movement-scheme:
In 6-8 it's just slow and horizontal.
In Secret 4 it's fast, scrolls horizontal, but a bit vertical, too, when it's done it unlocks the screens. The thing, that you can't go back is probably a matter of an XFE set in the screen left from it, or another tweak to the sprite...
In Secret 6 it just moves fast and horizontal
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Last update: 2012-12-31