Questions tagged [nes]

For questions about the different versions and products of the NES (Nintendo Entertainment System)

Filter by
Sorted by
Tagged with
14
votes
2answers
4k views

Is it possible to play Famicom games on the NES and utilize the extra sound channels?

I've seen there are adapters to convert Japanese Famicom games to work on the NES. You may have to remove the lockout chip, I can't remember. Anyway, many Famicom games included extra sound hardware ...
12
votes
1answer
2k views

Did all NES “Black Box” games come in carts with five screws?

When the NES was released, there were a list of original titles from Nintendo such as Duck Hunt, Super Mario Bros. and Metroid. These titles came in a distinctive box that was mostly black. Plus, the ...
22
votes
1answer
931 views

How does the NES PlayChoice arcade's security EPROM work?

I've read that the PlayChoice 10's security system includes a 64-bit serial EPROM that gets compared against the first 64 bits of code, and that it's possible to swap the ROMs between compatible ...
19
votes
2answers
1k views

Is it possible to procedurally determine the number of cycles a particular instruction takes on a 6502?

Most emulators store the number of cycles a particular instruction takes in an array, and then adds any conditional cycles if needed (when crossing page boundaries, for example). I'm wondering if ...
28
votes
1answer
4k views

How can I create a split-scroll effect in an NES game?

Games like Super Mario Bros. and Super Mario Bros. 3 were able to scroll the playfield but not the status bar: The status bars are clearly too big to be sprites, yet they don't scroll with the ...
9
votes
4answers
2k views

PAL NES in USA, 50Hz vs 60Hz

I was wondering if there existed a way to fix the difference in the running speeds of a PAL NES to run on TV's in the United States? Be it some converter or messing with the NES itself.
90
votes
8answers
27k views

Why would a NES game use an undocumented 1-byte or 2-byte NOP in production?

Reading the NESdev wiki page on CPU unofficial opcodes, I see a few games use an undocumented 2-byte NOP instuction in production: Puzznic, F-117A Stealth Fighter, and Infiltrator use $89 #i. Beauty ...
16
votes
6answers
4k views

Can removing a cartridge from an NES (or any other cartridge-based game system) damage the hardware or software?

On some cartridge-based video game systems (NES, Game Boy Color, etc.) it is possible to remove the cartridge while the game system is still powered on. What kind of damage can this behavior do to ...
5
votes
0answers
315 views

R.O.B can't move up or down

I got this R.O.B (Robotic Operating Buddy for the NES), first time I turned him on his arms wouldn't close, so I took him apart and cleaned him. I put the gears back into place. After turning him on ...
7
votes
2answers
391 views

NES only works when I press reset

My aunt gave me her old nes, it was really dirty. I opened it up, cleaned it really good, cleaned the games too. I had to get a new power pack and av cables for it. I plugged everything into my TV (...
79
votes
2answers
19k views

Why does the Minus World exist?

In Super Mario Bros. for the NES and Famicom there exists a secret world, accessible by clipping through a wall to the first warp zone and entering the left-most pipe. This pipe will take you to ...
8
votes
1answer
2k views

Can I use a UK power adapter in NTSC NES

I have an old US (NTSC) NES system which we found in the garage. Sadly the power supply is missing. As I now live in the UK, I was wondering if it is possible to use a UK NES power supply with it. ...
28
votes
2answers
4k views

How does the NES Light Gun work?

Modern motion detection video game systems (Wii/Wii U, Xbox Kinect, PS Move, etc.) need sensors to read for motion and user input. However, when you play Duck Hunt (and some other games) on the NES, ...
16
votes
1answer
4k views

How Did the 10NES lockout chip work?

One of the differences between the Japanese Famicom and the NES released outside of Japan is that the NES shipped with a lockout chip which prevented bootleg and imported games from working on the ...
10
votes
3answers
1k views

Why are the PPU registers on the NES mirrored?

The NES Picture Processing Unit has eight memory-mapped registers to the CPU in registers $2000 to $2007. The are incompletely decoded, so they are mirrored every 8 bytes from register $2008 to $...
16
votes
2answers
14k views

What are the differences between the Japanese Famicom and American NES?

In Japan, Nintendo's first home console was sold as the Family Computer (Famicom), while in the US it was later sold as the Nintendo Entertainment System (NES). Other than the region lock out for ...
19
votes
2answers
6k views

Why do NES sprites flicker when there are a lot of them?

Sometimes, NES sprites flicker when there are a lot of them, like at 1:19 in this video of Super Mario Bros. Why did they do this?
51
votes
3answers
10k views

What was Nintendo's Software Development Environment for NES Games?

(This question was inspired by my previous question What kind of software was used to develop Nintendo 64 titles?) The NES used a modified 6502 processor and most games were written in Assembly. ...
17
votes
2answers
2k views

Can I run a NES emulator off the original cartridges?

Every NES emulator I've found runs off ROM dumps. Would it be possible to run an emulator using the original cartridges directly? It's probably not the most practical way of doing things, but the "...
33
votes
3answers
3k views

Reconditioning and cleaning old Nintendo (and other) game cartridges

I used to blow the dust out of the cartridges but I heard that can actually damage the cartridge or the system itself. I am looking for the proper way to clean old Nintendo game cartridges (such as ...

1
2