Search found 398 matches

by loopy
Thu Dec 10, 2020 10:49 am
Forum: NESdev
Topic: .fds format: Can checksums be heuristically detected?
Replies: 51
Views: 18093

Re: .fds format: Can checksums be heuristically detected?

I have a stack of Roland sample disks, if you want to play around with them. Density is exactly the same as FDS. I've used FDSStick to read them out before, but haven't tried analyzing the format.
by loopy
Fri Dec 04, 2020 7:31 pm
Forum: NESdev
Topic: .fds format: Can checksums be heuristically detected?
Replies: 51
Views: 18093

Re: .fds format: Can checksums be heuristically detected?

I think the gap issues, and mechanism behind it is pretty well understood. There are games larger than 64k per side, so a 64k restriction doesn't make sense to me. NewRisingSun proposed a "kitchen sink" format that seemed reasonable to me but it was pulled. Seems like something like that is necessar...
by loopy
Sun Jul 19, 2020 7:47 pm
Forum: NES Hardware and Flash Equipment
Topic: FDSStick: writing back .raw files
Replies: 4
Views: 3488

Re: FDSStick: writing back .raw files

The FDSStick software looks for the first few bytes of a disk header ("block type 1"). It doesn't find it and gives up. I don't know how you're generating your raw files but something doesn't look right. Compare with a dumped image. Values in a .raw file are just timing between pulses on the data pi...
by loopy
Mon Jun 22, 2020 6:55 am
Forum: NES Hardware and Flash Equipment
Topic: FDSStick: writing back .raw files
Replies: 4
Views: 3488

Re: FDSStick: writing back .raw files

If you send me sample files I'll try to figure out what's wrong.
There is no header / footer, that's just junk data.
by loopy
Fri Oct 18, 2019 3:01 am
Forum: NES Hardware and Flash Equipment
Topic: Why are Famicom Disk Systems so picky?!@...
Replies: 10
Views: 7371

Re: Why are Famicom Disk Systems so picky?!@...

http://3dscapture.com/junk/FDSStick_debug_20171229.exe Use a known good disk (written by a properly calibrated drive) for adjusting your drive. Preferably a real commercial disk, not bootleg/copied. Push the "Test" button to scan a disk. The software shows a graphical representation (blue wavy line...
by loopy
Thu Apr 04, 2019 12:17 pm
Forum: NESemdev
Topic: Famicom Disk System emulation
Replies: 17
Views: 17206

Re: Famicom Disk System emulation

byuu wrote:Oh boy. The wiki needs some serious updates, then. I'll also add:
The wiki is crap. Brad Taylor's .txt file (linked at the bottom of the wiki) is much more useful.
by loopy
Sat Mar 09, 2019 6:07 pm
Forum: NES Hardware and Flash Equipment
Topic: The state of PowerPak mappers
Replies: 32
Views: 20743

Re: The state of PowerPak mappers

You're free to use the code however you like, consider it public domain.
by loopy
Fri Mar 08, 2019 2:24 pm
Forum: NES Hardware and Flash Equipment
Topic: FDSStick (256M version) software question
Replies: 5
Views: 8986

Re: FDSStick (256M version) software question

That code on github is ancient, it's not compatible with the current firmware. I can put up something more current, it might take a few days though.
by loopy
Mon Mar 04, 2019 1:44 am
Forum: NES Hardware and Flash Equipment
Topic: The state of PowerPak mappers
Replies: 32
Views: 20743

Re: The state of PowerPak mappers

It's been ages since I've gone over the powerpak MMC3 code, but I'll dig it up if there's something that needs fixing. I have MMC3A,B,C carts I can test on if needed.
by loopy
Thu Feb 14, 2019 5:05 pm
Forum: NES Hardware and Flash Equipment
Topic: Oversize FDS disk images
Replies: 40
Views: 37735

Re: Oversize FDS disk images

The largest Game Doctor image I have is 66458 bytes (and that's really pushing the limits). The largest Game Doctor game I've seen is 12 sides. I guess 13, if you want to count the saver disk -- some Game Doctor devices do save states which adds another disk, I don't know if you want to accomodate t...
by loopy
Mon Feb 11, 2019 6:05 pm
Forum: NES Hardware and Flash Equipment
Topic: Oversize FDS disk images
Replies: 40
Views: 37735

Re: Oversize FDS disk images

They are just cartridge games ported/hacked to run from disk (that was the purpose of Game Doctor after all). I'm not aware of any original games made specifically for game doctor hardware. There's nothing special about the disks themselves (aside from the size), they follow the standard FDS disk fo...
by loopy
Wed Feb 06, 2019 3:51 pm
Forum: NES Hardware and Flash Equipment
Topic: Oversize FDS disk images
Replies: 40
Views: 37735

Re: Oversize FDS disk images

Even if you're right, why make a format that relies on a bunch of assumptions? Simpler solutions exist, I don't know why you're doubling down on this point.
by loopy
Wed Feb 06, 2019 2:15 am
Forum: NES Hardware and Flash Equipment
Topic: Oversize FDS disk images
Replies: 40
Views: 37735

Re: Oversize FDS disk images

Welp, you asked for opinions, you got mine. I'm a fan of KISS.
It's your thing, do what you like. As you said, it's for your own emulator and not likely to see adoption anyway so go nuts and make a FDS 2.0.
by loopy
Wed Feb 06, 2019 1:59 am
Forum: NES Hardware and Flash Equipment
Topic: Oversize FDS disk images
Replies: 40
Views: 37735

Re: Oversize FDS disk images

*shrug* Inconvenience of multiple files, or inconvenience of another new unsupported (except in your own emulator) format. I prefer the former, personally... Every Game Doctor and Magicard disk still uses the \x01*NINTENDO-HVC* disk header, so I do not follow. If a game happens to have 0x01,0x2A in...