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- Path: tdl.com!tuna
- From: tuna@tdl.com (Chris Cochems)
- Newsgroups: comp.sys.cbm
- Subject: Re: A Hacker's Question..
- Date: 4 Jan 1996 06:51:07 GMT
- Organization: The Diamond Lane
- Message-ID: <4cftcr$p28@news.tdl.com>
- References: <3866938583@news.tdl.com> <820634998@p71.f411.n201.z2.ftn> <4celmm$5a7@news.tdl.com> <9601040205.AA0008v@cosine.demon.co.uk>
- NNTP-Posting-Host: tdl.com
- X-Newsreader: TIN [version 1.2 PL2]
-
- Jason Kelk (tmr@cosine.demon.co.uk) wrote:
-
- : Well, if the cart is using JMP $FCFF to reset the machine then *some* of the
- : locations Pontus mentions remain intact. But at least $0400-$07e8,
- : $07f8-$0803 and $fd30-$fd50 are going to be either corrupted or cleared and
- : as Pontus says its a rare game these days that doesn't use at least one of
- : these sets of locations! BTW, which Fast Load cart is it?
-
- It's THE Fast Load cartridge by Epyx. Hardware reset is damn near instant.
-
- : : Anyway, coders can easily defeat all snapshot carts by putting code to
- : : read the cartridge IO lines, and making sure all of them return either
- : : zero or non-constant values. If ANY of those locations contains a
- : : constant non-zero value, there's a cartridge in for sure. I don't think
- : : there is a snapshot cartridge that cannot be found in this fashion.
-
- : Well, my Action Replay V6 seems to be totally happy loading all my software.
- : The only time I get any difficulties is when I freeze 'em. I've never seen
- : a program block the cart before its finished loading, but the original
- : version if Timecruncher 4.2 (Beastie Boys version) won't unpack with some
- : carts present.
-
- Hmm. THe ONLY way this could work is if the pro action relay disconnected
- ALL lines when it was told to hide. It's pretty impressive if it managed
- to pull that off.
-
- Of course, even that pro action replay can be beaten. The other way to
- beat capture carts is disk interactivitiy. And it has to 1) use a
- fastloader (this is a given, or it would be too slow) and 2) use variable
- bit density or better to store ALL it's data. If nearly every file is
- protected, a freezer cart won't help you.
-
- : The smartest anti-cart system I ever saw blocked the Expert cartridge by
- : reprogramming the thing when you tried to turn it on!
-
- Heheheh.
-
- : : I have seen games (such as Ultimate Wizard) that will not load if you
- : : have ANY cartridge in. Even with a disabled fastload, it will not work!
-
- : Tried it with an Action Replay in "hide" mode? I have loads of games that
- : hate the AR fastload but work fine when the cart is hiding. More often than
- : not it seems to be a conflict between the cart fastloader and the games!
-
- Well, I don't have a Pro Action Replay, just a fast load and a "Capture"
- cart that will save disk RAM in it's capture if you ask it to (to beat the
- games that beat ISEPIC).
-
- Well, as I said, Ultimate Wizard polls the cartridge control lines and
- sees what's there, and bombs if it finds a constant non-zero value.
- THat's the problem, no tthe fastload cart, as when it's disabled, it's
- GONE, and can only be re-enabled by diverting pointers into the
- cartridge IO lines, or entering the right one yourself..
-
-
- Chuck Cochems
-