nm debugging.md

• $0020 - Current level (called round?)
• $0021 - Current level bonus (this value is displayed after multiplying by 100)
• $001A - Joypad input

  0000 0000
  |||| ||||
  |||| |||+- right (1)
  |||| ||+-- left  (2)
  |||| ||+-- up    (4)
  |||| |+--- down  (8)
  |||+- Start (1, pause, confirm etc)
  ||+-- Select (2, skip level)
  |+--- B (4, jump)
  +---- A (8, jump)

• $0044 - player previous direction? (copied from $0052)

• $0045 - player previous tile_id? (copied from $0721)

• $0046 - player previous direction? (copied from $0052)

• $0050 and $0051 - something related to jumping

  • $0050 is 0 when standing and 1 when jumping
  • $0051 is 0x12 when standing. goes from 0x03 at the start of the jump, to 0x0b at the peak of the jump, and back to 0x12
  • Because these two addresses are being constantly written, I suspect that gravity is being applied at all times.

• $0052 - either direction player is facing or last directional input

• $0053 - player xspeed (incremented by 1 each frame, capped at 2)

• $00D0 - an enemy metasprite used to calculate the enemy position ($00d0 = y, $00d3 = x)

// fucking japs, man
struct Sprite {
  uint8_t y;       // 00
  uint8_t tile_id; // 01
  uint8_t palette; // 02  00 = enemy, 01 = player
  uint8_t x;       // 03
} // size 4;

struct MetaSprite {
  Sprite top_left;     // 00
  Sprite top_right;    // 04
  Sprite bottom_right; // 08
  Sprite bottom_left;  // 0c
} // size 16;

• $0700 to $07FF seems to be an array of MetaSprites
• $0700 helicopter and red baloon MetaSprite
• $0720 player MetaSprite
• $0730 fireball MetaSprite (moves up/down in a sine wave from left to right)
• $0740 enemy MetaSprite
• $0750 enemy MetaSprite?
• $0760 enemy MetaSprite?
• $0770 "Help!" balloon MetaSprite (doesn't move, takes 64 frames to appear, stays for another 64)
• $0780 girl MetaSprite
• $0790 fruit1 MetaSprite
• $07a0 fruit2 MetaSprite
• $07b0 fruit3 MetaSprite
• $07c0 fruit4 MetaSprite
• $07e0 spring MetaSprite
• $07f0 spring MetaSprite

Entities:

• Helicopter:
  • Moves from right to left in a 3 tile wide sine wave centered at the player (i.e. moves from one tile bellow the player to one tile above it).
  • Only seems to come when the vertical area overlaps with an enemy.
• Red Balloon:
  • Moves from left to right in a similar manner to the Helicopter.
  • Only seems to come when the vertical area doesn't overlap with an enemy.