9 replies to this topic

[amos89]

Hi programmers,

i've i nice idea for you!
like the title says, a gameboy emulator!
i don't know i've someone nows how the gameboy works, but i'm sure i meed be possible!
and the files (.gb) are only par exemple 64kb.
so let's programm it?

[huhn_m]

do you have any specs about the format?

Actually I don't think that it is too easy because AFAIK the screen of the gameboy does not match the one of the casio and you won't get things like sound.

Also I'm not sure if the AFX is powerfull enough to do all the animations the gameboy does simultaneously.

If you do have specs, feel free to post them here but please do NOT post links to gb images as this is illegal and we'd have to remove them.

[tekkeitserktok]

not possible?

Gameboy:

CPU: 6502 custom CMOS 4MHz (1.2MHz in game) --> possible
RAM/ROM: 8K ram / 8 K vid?o (tiles in rom)--> possible
GRAPHICS : 160x144x4 gray levels --> possible --> gxLib

I think it's possible but emulator must be programing in ASM (soory for my english too bad ) for speed...and the files .gb must be decoding...but it's possible! (motivate motivate!!!)

[huhn_m]

1) DO YOU HAVE SPECS?
2) How would you solve the problem with the screen resolution? The grayscale is not the problem.

[dscoshpe]

The specs are everywhere so that is not an issue. The screen size is a bother, would have to sample down in order to match the AFX screen and maintain the correct ratio.

And ignore all sound of course.

- dscoshpe -

[Marco]

Gameboy:

CPU: 6502 custom CMOS 4MHz (1.2MHz in game) --> possible
RAM/ROM: 8K ram / 8 K vid?o (tiles in rom)--> possible
GRAPHICS : 160x144x4 gray levels --> possible --> gxLib

I think it's possible but emulator must be programing in ASM (soory for my english too bad ) for speed...and the files .gb must be decoding...but it's possible! (motivate motivate!!!)

As I remebmer it's a Z80, not 6502. That's fine cause Z80 is a bit more x86 related than 6502. Also, the AFX's CPU (NEC V30) supports a 8080 emulation mode, meaning we can run 8080 code directly on that CPU without any interpreter. Unfortunately we can't use that feature because Z80 is 8080 compatible but not vice versa (Z80 has an extended instruction set compared to it).

I think it would be hardly possible to create a GB emulator for AFX:

- AFX has a CPU more than twice that fast, but GB has a graphics adapter with hardware accelerated support for sprites (moving objects) which on AFX the CPU needed to do

- GB has a bigger display which you can't scale down to 128x64 that simple. You will loose more than half of the pixels (--> crappy graphics), and it will be too slow

[tekkeitserktok]

ok i understood...and i forgot the sound...lol
the best solution is to make an adaptation of gameboy's games (like me with zelda!)

[jmx]

Then we have to make a small sound card We have a 2.5mm stereo output

[Andy.Davies]

already been done, look in the filesharing

[Shadow Emperor H3LLFIR3]

The casio cg-50 has a gameboy emulator that i use all the time! It's called prizoop. it does .gbc