Re: [stella] Cartridge dumper again

Subject: Re: [stella] Cartridge dumper again
From: Glenn Saunders <cybpunks2@xxxxxxxxxxxxx>
Date: Sat, 11 Jan 2003 10:26:07 -0800
At 11:21 PM 1/10/2003 -0800, you wrote:
When dumping a cart with RAM, the cart RAM contents are essentially
random.  My dumper uses weak pullup resistors on the data bus, so when I
"read" from a RAM "write" address, I read $FF.  Hence when I write a dump,
I write $FF at these locations.

That's what it should be, I think. Either that or $0. But more likely $FF as that's the standard for unused portions of ROM, isn't it?

Ok, there's the problem, what's the solution?  Especially given that a
whole BUNCH of roms (over 2000) are floating around the net.

I think we should set a standard where these address ranges should be $FF and slowly replace the images online with the official version. Checksums are a great way to determine differences between arbitrary files without having to make any assumptions about the type of the file. Having a checksum that omits those blocks would defeat the purpose of a simple checksum of the entire file.

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