Displaced Gamers

How do cartridges and the Famicom Disk System map into CPU addressing? What are the differences between MMC1 Cart Zelda & FDS Zelda?

NES PPU, Scrolling, and some background talk - how does it all work?

Companion to Nintendo Power Vol. 20's article on "Why Your Game Paks Never Forget" - a sampler of cartridge contents with a brief explanation. Featured Game Genie Codes: (Take note that I have not tested all of these with a real cartridge) Mario 3 Matching Game: Make middle image larger AXKNSZGL : Reduce top scanline ending position from 52 to 32 AKKNVZGU : Increase middle scanline ending position from 52 to 72

What happens if we change the circuit board to "Vertical" for Super Mario Bros.?

The massive code behind moving Mega Man + the Zipping Bug. How does it work behind the scenes? What went wrong? Featured Game Genie Codes: (Take note that I have not tested all of these with a real cartridge) Add flashman boss room background into a flashman corridor: NSXAUPPE Fix left side tile ejection (Preventing Zipping): AOEAVOAU

Code walk of a Mega Man 2 subroutine with cycle counting, execution time as a frame percentage, and improving Mega Man 3. 0:00 Intro 0:41 Code Walk 14:13 The Math (Percentage of Frame) 17:54 Marked Breakpoints 24:26 Mega Man 3 Performance 27:19 Outro

Breakdown of Quick Man's Behavior and the BUGS in Mega Man 2 for the NES

An odd instruction in the code has been analyzed, and it appears the Warp Zones do not work in the way they were designed. Let's fix the Minus World bugs! Featured Game Genie Codes: (Take note that I have not tested all of these with a real cartridge) Scroll Lock/Unlock Fix OKXULN - AND to CMP AEXUGY - Mario YPage to #$00 Pipe Trio Fix OKXULN - AND to CMP AEXUGY - Mario YPage to #$00 SXULZN - Pipes Exit up to 1-2 0:00 Introduction 1:13 How a Mario Level is built 2:41 SMB Utility (Level Editor) 5:56 Objects and Enemies for Minus World 8:29 Analysis with Emulation 11:42 Scroll Lock/Unlock Fix 12:42 Pipe Trio Fix 14:53 Outro

Six game code investigation of Minus World including the fix in Lost Levels/All Night Nippon as well as how to access it in All-Stars with a Game Genie. Featured Game Genie Codes: Disclaimer: Different regions or versions of All-Stars may require different codes for the Game Genie. Restore minus world in All-Stars: Select which Bypass check you want then the destination to work: Require Block Clip to Bypass Checks: DD39-6DA2 6DA4-DF2D OR Go down Right Pipe on 1-2 to Bypass Check: 6DA4-DF2D World H $11: FFB2-D7DA World T $1D: F2B2-D46A World U $1E: F3B2-D46A World B $0B: D8B2-D46A Water World 1 $32: 74B2-D46A Water World 2 $35: 79B2-D46A Star World $2A: 4CB2-D46A Wave World 1 $2D: 42B2-D46A Wave World 2 $2C: 4AB2-D46A Here is the link to the SNES Game Genie encoder: https://games.technoplaza.net/ggencoder/js/

What is collision detection? Code investigation into the velocity and collision logic in the water level as well as some hitbox mistakes. [0:00] Opening [0:49] Level setup [1:10] Basic Object Collision [2:40] Bubbles and Current [4:33] Code Walk: Controller Input and Velocity Application [10:57] Code Change Proposal [12:41] Environmental Collision Detection [17:39] Conclusion and Outro Featured Game Genie Codes: (Take note that I have not tested all of these with a real cartridge) Bubbles follow Current IEKVPLPA Fix Swim Down Speed YZXXXATK Raise Bottom collision detection IASKVAYA IASGVAYA IASKKAYA Fix Right collision detection PANKVAYA Fix Left collision detection PEEGEAYA

Breakdown of the physics-defying logic of jumping in the game. Frame rate, gravity, and special code all apply. Let's dive in. Featured Game Genie Codes: (Take note that I have not tested all of these with a real cartridge) 6 Frame Short Jump (Counter 4->6) TAOXIAGA Increase Gravity Per Frame: 84->116 GNNZIIGI Short Jump Velocity Change Inter: -3 -> -2 VYXXGESN High Jump Velocity Change Inter: -6 -> -8 EYKZGEXN

Examination of the time between pressing the button and a forward attack. Are the attacks slower than they should be? [0:00] Lag Explained [2:35] Order of Operations [3:33] Animation Delay [10:02] Wind-Up Explained [10:36] Some Game Design Talk [10:57] Input Lag - Logic and Code [12:56] The DMC Problem [15:22] It all Adds up [16:09] Conclusion Featured Game Genie Codes: (Take note that I have not tested all of these with a real cartridge) Speed up Leo's Attack PEXPZLZA PEOPTLZA NNOASYAE Speed up Raphael's Attack ZEXOLLPA ZEOOYLPA Speed up Michelangelo's Attack ZEXOALPA ZEOOGLPA Speed up Donatello's Attack (4) GEOOPLIA GEXPILIA NNXEOYAE Speed up Donatello's Attack (3) LEOOPLIA LEXPILIA NNXEOYAE Speed up Donatello's Attack (2) ZEOOPLIA ZEXPILIA NNXEOYAE Speed up Donatello's Attack (1) PEOOPLIA PEXPILIA NNXEOYAE View DMC Conflicts on Secondary Weapon Count VTEKZISA EZEKLIVN Turn off DMC Music AVOASOAG

How does the Critical Hit with the Whip work in Castlevania? - Behind the Code

Technical dive into how to use the NES controller to break level loading in Castlevania.