Author Topic: For Genesis what's the norm? .md or .bin?  (Read 289 times)

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Offline sheperdfan

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For Genesis what's the norm? .md or .bin?
« on: March 31, 2018 - 23:44:47 »
So, i keep seeing these 2 formats .bin and .md.
Which ones should i prefer and why?
I need a history lesson. Please enlighten me.

Thanks!

Offline Maddog

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Re: For Genesis what's the norm? .md or .bin?
« Reply #1 on: April 01, 2018 - 15:24:00 »
Oh, the old topic of MegaDrive/Genesis extensions. :)

.bin is the straight binary data from the cart, nothing added or removed.
.smd is an interleaved and headered format which used to be produced by an old copier device (Super Magic Drive). The technical info about why this was done is more or less obsolete now. Nowadays interleaving makes the ROM more complicated with no real reason, this header is not really needed nowadays and .smd files are more or less on the way out as they offer 0 benefits for their additional complexity.
.md AFAIK in most cases is exactly the same as .bin. The only benefit to using that is that .bin is a generic extension ("binary") which could correspond to virtually any computer system, while .md is more system-specific and you can tell at a glance that this file is a MegaDrive ROM. NoIntro names the Genesis/MegaDrive roms in their dats with the .md extension. I have seen a couple of references to another ancient copy device called Multi Game Doctor using the .md extension, but I am not familiar with that and for sure it was never a widespread format for MegaDrive/Genesis roms. I suppose most of the roms you stumble upon with the .md extension nowadays are because of NoIntro.

Also, years ago you could stumble on .gen files which again were basically .bin. But this extension never really caught on and I haven't seen it being used anywhere in recent years.

Offline sheperdfan

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Re: For Genesis what's the norm? .md or .bin?
« Reply #2 on: April 01, 2018 - 16:05:35 »
EDIT: Gotcha now!

NOINTRO = .md
GoodGen = .bin

From my test .md are just .bin with extension renamed:

Code:
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« Last Edit: April 01, 2018 - 21:26:08 by sheperdfan »

Offline yeahimdukenukem

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Re: For Genesis what's the norm? .md or .bin?
« Reply #3 on: April 01, 2018 - 21:49:21 »
Please correct me, but I think GoodGen accepts both extensions.

Offline Connie

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Re: For Genesis what's the norm? .md or .bin?
« Reply #4 on: April 01, 2018 - 21:58:32 »
You can have any extention you want. Just edit Goodinfo.cfg
Whatever is currently scanned is based purely on what entries Cow adds to the default .cfg

I really don't understand why we can't move past this stupid .ext naming. Unless it's something to do with Nix based OS, you can have whatever extention you want.
So why not .megadrive / .genesis ?
We're in the age of 64bit, not 8bit, DOS and 8.3 naming!
"Get busy living or get busy dying" - Shawshank Redemption (Stephen King)

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Offline sheperdfan

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Re: For Genesis what's the norm? .md or .bin?
« Reply #5 on: April 01, 2018 - 22:35:41 »
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Please correct me, but I think GoodGen accepts both extensions.
I've looked at goodgen 3.00 they are all .gen actually  ???


I'll stick with no-intro .md's for no reason.