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Tetris (NES, Nintendo)/RAM map: Difference between revisions
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(Flipped 40-5F and 60-7F address blocks to reflect usage in the ASM, added info about spawn delay counters) |
Lelegofrog (talk | contribs) m (title consistency) |
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{{rammap|game=Tetris (NES)}} | {{rammap|game=Tetris (NES, Nintendo)}} | ||
{| | {| | ||
|0017||random seed | |0017-0018||16-bit random seed | ||
|- | |- | ||
|0019||PieceID of last nextpiece generated by rng | |0019||PieceID of last nextpiece generated by rng | ||
| Line 15: | Line 15: | ||
|- | |- | ||
|0042||cur PieceID | |0042||cur PieceID | ||
|- | |||
|0044||current speed level | |||
|- | |- | ||
|0045||fall timer | |0045||fall timer | ||
| Line 20: | Line 22: | ||
|0046||left/right autorepeat timer | |0046||left/right autorepeat timer | ||
|- | |- | ||
|0047||speed level | |0047||starting speed level | ||
|- | |- | ||
|0048|| | |0048||Current game phase:<br>1 - active time<br>2 - start of spawn delay; update bg tilemap<br>3 - line clear check<br>4 - wait for line clear animation<br>5 - update score counter, etc.<br>6 - A-Type: dummy frame; B-Type: goal check<br>7 - normally a dummy frame -- contains logic for unfinished 2 player mode<br>8 - end of spawn delay; prepare next piece | ||
<br>1 - active time | |||
<br>2 - start of spawn delay; update bg tilemap | |||
<br>3 - line clear check | |||
<br>4 - wait for line clear animation | |||
<br>5 - update score counter, etc. | |||
<br>6 - A-Type: dummy frame; B-Type: goal check | |||
<br>7 - normally a dummy frame -- contains logic for unfinished 2 player mode | |||
<br>8 - end of spawn delay; prepare next piece | |||
|- | |- | ||
|0049||counter for bg tilemap update (used when 0048 == 2) | |0049||counter for bg tilemap update (used when 0048 == 2) | ||
| Line 66: | Line 60: | ||
|00B1-00B2||demo time:<br> | |00B1-00B2||demo time:<br> | ||
00B2 set to 0 when title screen appears; goes to demo at 00B5 = 5 | 00B2 set to 0 when title screen appears; goes to demo at 00B5 = 5 | ||
|- | |||
|00B5||Bits set for 1 frame when NES Controller buttons are initially pressed (ABsSUDLR) | |||
|- | |||
|00B6||NES Controller button states (ABsSUDLR) | |||
|- | |||
|00B8||Address of the playfield ($0400 for player 1, $0500 for player 2) | |||
|- | |- | ||
|00BE||Number of players. Always 1 by default, but forcing it to 2 enables unfinished 2 player Versus functionality. | |00BE||Number of players. Always 1 by default, but forcing it to 2 enables unfinished 2 player Versus functionality. | ||
|- | |- | ||
|00BF||PieceID of next piece | |00BF||PieceID of next piece (valid orientations: $02, $07, $08, $0A, $0B, $0E and $12) | ||
|- | |- | ||
|00C1||game type (marathon = 0, 25lines = 1) | |00C1||game type (marathon = 0, 25lines = 1) | ||
| Line 131: | Line 131: | ||
== Copy of OAM == | == Copy of OAM == | ||
At $0200 is a copy of OAM, the display list. Usually the falling piece occupies $0200-$020F, and the next piece occupies $0210-$021F. | At $0200 is a copy of OAM, the display list. Usually the falling piece occupies $0200-$020F, and the next piece occupies $0210-$021F. | ||
{{Internal Data|game=Tetris (NES, Nintendo)}} | |||
Latest revision as of 04:03, 5 February 2024
The following article is a RAM map for Tetris (NES, Nintendo).
| 0017-0018 | 16-bit random seed |
| 0019 | PieceID of last nextpiece generated by rng |
| 001A | number of pieces this poweron |
| 0033 | spun on in wait4vbl loop at AA37 |
| 0040 | cur piece x |
| 0041 | cur piece y |
| 0042 | cur PieceID |
| 0044 | current speed level |
| 0045 | fall timer |
| 0046 | left/right autorepeat timer |
| 0047 | starting speed level |
| 0048 | Current game phase: 1 - active time 2 - start of spawn delay; update bg tilemap 3 - line clear check 4 - wait for line clear animation 5 - update score counter, etc. 6 - A-Type: dummy frame; B-Type: goal check 7 - normally a dummy frame -- contains logic for unfinished 2 player mode 8 - end of spawn delay; prepare next piece |
| 0049 | counter for bg tilemap update (used when 0048 == 2) |
| 004A-004D | line numbers being cleared |
| 004E | down autorepeat timer |
| 004F | down hold timer (cleared to 0 on release) |
| 0050-0051 | number of lines (BCD little endian) |
| 0053-0055 | score (little endian bcd) |
| 0052 | line clear animation counter (incremented when frame counter 00B1 % 4 == 0) |
| 0056 | number of lines being cleared |
| 0057 | line clear check counter (used when 0048 == 3) |
| 0058 | game over animation (negative: delay; $00: top; $14: finish) |
| 0059 | B-type height level |
| 0060-007F | mirror of 40-5F. If 00BE is forced to equal 2, this block is used for the unfinished 2 player mode. |
| 00A8 | copyright notice autoadvance time left |
| 00AC | same as 0042/0062 for collision? |
| 00AD | Playfield base address of current piece for collision? |
| 00AE | Y position of current piece in spritespace |
| 00B1-00B2 | demo time: 00B2 set to 0 when title screen appears; goes to demo at 00B5 = 5 |
| 00B5 | Bits set for 1 frame when NES Controller buttons are initially pressed (ABsSUDLR) |
| 00B6 | NES Controller button states (ABsSUDLR) |
| 00B8 | Address of the playfield ($0400 for player 1, $0500 for player 2) |
| 00BE | Number of players. Always 1 by default, but forcing it to 2 enables unfinished 2 player Versus functionality. |
| 00BF | PieceID of next piece (valid orientations: $02, $07, $08, $0A, $0B, $0E and $12) |
| 00C1 | game type (marathon = 0, 25lines = 1) |
| 00C2 | music type (sugarplum = 0, off = 3) |
| 00C3 | copyright notice unskippable time left |
| 00F5 | controller 1 newly pressed buttons |
| 00F7 | controller 1 state (0x80 = A pressed, 0x40 = B pressed...) |
| 00FC | vertical scroll (conjecture based on code at $80C5) |
| 00FD | horizontal scroll (conjecture based on code at $80C5) |
| 00FE | PPUMASK value |
| 00FF | PPUCTRL value |
| 0200 | Copy of OAM |
| 03F0-03F1 | number of T tetrominoes dealt (little endian BCD) |
| 03F2-03F3 | number of J tetrominoes dealt |
| 03F4-03F5 | number of Z tetrominoes dealt |
| 03F6-03F7 | number of O tetrominoes dealt |
| 03F8-03F9 | number of S tetrominoes dealt |
| 03FA-03FB | number of L tetrominoes dealt |
| 03FC-03FD | number of I tetrominoes dealt |
| 0400-0409 | Row $00 (top of playfield) |
| 040A-0413 | Row $01 |
| 04BE-04C7 | Row $13 (bottom) |
| 0680-06CF | Music related |
| 06D0-06FF | Sound effects related |
| 0700-075x | high score tables |
| 0718-071D | B-type top name |
| 071E-0723 | B-type second name |
| 0724-0729 | B-type third name |
PieceID
A PieceID is a number representing both a tetromino and an orientation. For instance, $11 is a I up and down, and $12 is an I across. Tetrominoes S, Z, and I have two PieceIDs; O has only one. The others have four. Because the PieceID table is "optimized" in this way, it'll take more extensive asm hacking to get Bombliss or Tetris DS rotation in.
The next piece is stored at $00BF. Poking a value into $00BF that's a valid PieceID but is not the starting orientation for that tetromino results in the next piece being drawn as a solid (not textured) O tetromino, but the next piece is dealt in the proper starting orientation.
Copy of OAM
At $0200 is a copy of OAM, the display list. Usually the falling piece occupies $0200-$020F, and the next piece occupies $0210-$021F.
Internal Data for Tetris (NES, Nintendo)
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