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Super Mario Bros./Notes: Difference between revisions
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'''Hacking the End-of-Level Castles''' | |||
1) Get some graphing paper, and start cordoning 2x2 squares. Make a 5x5 block of such squares (10x10 overall). | |||
2) Reading right-to-left, from the top row down, you've got the metatile defined by $17DF, $17E0, $17E1, etc......, $17F7. | |||
3) This linear string of 25 bytes can be represented on your graph paper like this: | |||
5 4 3 2 1 | |||
10 9 8 7 6 | |||
15 14 13 12 11 | |||
20 19 18 17 16 | |||
25 24 23 22 21 | |||
(In other words, the first byte in this string codes for the upper-rightmost metatile, the second byte codes for the metatile directly to #1's left, etc.) | |||
4) The large castles at the end of every X-3 level (and the beginning of most X-1 levels) are simply the small castle stacked on top of another, slightly taller one. This taller castle is 6 metatiles high and five metatiles wide, and is coded in a similar right-to-left, top-down fashion. Its linear byte sequence begins at $17F8. | |||
5) The little side-sections on the X-3 castle type are actually the same background image that occurs throughout World 8-3. This image is 1 metatile wide and eleven metatiles high (although it only appears to be six metatiles high since the first five bytes are assigned transparent "00" values). Its coding begins at $13CE and ends at $13D8. | |||
Here are some metatile values to keep handy: | |||
00: Nothing/Transparent | |||
45: Castle Top, sky background | |||
46: Castle Window (left) | |||
47: Castle Brickwork (generic filler) | |||
48: Castle Window (right) | |||
49: Castle Top, brick background | |||
4A: Castle Entrance (top) | |||
4B: Castle Entrance (bottom) | |||
Revision as of 02:57, 24 December 2007
Hacking the End-of-Level Castles
1) Get some graphing paper, and start cordoning 2x2 squares. Make a 5x5 block of such squares (10x10 overall).
2) Reading right-to-left, from the top row down, you've got the metatile defined by $17DF, $17E0, $17E1, etc......, $17F7.
3) This linear string of 25 bytes can be represented on your graph paper like this:
5 4 3 2 1 10 9 8 7 6 15 14 13 12 11 20 19 18 17 16 25 24 23 22 21
(In other words, the first byte in this string codes for the upper-rightmost metatile, the second byte codes for the metatile directly to #1's left, etc.)
4) The large castles at the end of every X-3 level (and the beginning of most X-1 levels) are simply the small castle stacked on top of another, slightly taller one. This taller castle is 6 metatiles high and five metatiles wide, and is coded in a similar right-to-left, top-down fashion. Its linear byte sequence begins at $17F8.
5) The little side-sections on the X-3 castle type are actually the same background image that occurs throughout World 8-3. This image is 1 metatile wide and eleven metatiles high (although it only appears to be six metatiles high since the first five bytes are assigned transparent "00" values). Its coding begins at $13CE and ends at $13D8.
Here are some metatile values to keep handy:
00: Nothing/Transparent 45: Castle Top, sky background 46: Castle Window (left) 47: Castle Brickwork (generic filler) 48: Castle Window (right) 49: Castle Top, brick background 4A: Castle Entrance (top) 4B: Castle Entrance (bottom)