Subject: Re: [stella] [OT] Games using unofficial opcodes From: "B. Watson" <atari@xxxxxxxxxxxxxx> Date: Fri, 3 Jun 2005 09:14:46 -0400 |
On Fri, 3 Jun 2005, Fred Quimby wrote: > There were some believable rumors though. Supposedly there was a class of > programs that would destroy disk drives in a matter of hours by vibrating > the drive head much faster than specifications or banging it against the > stops too fast, repeatedly, until the drive failed. That was the standard format disk command for Commodore 1541 drives: it banged the head against a mechanical stop repeatedly, causing it to go out of alignment and (eventually) break. Another thing I remember (vaguely) is that there was a way to destroy early model TRS/80 machines with a single POKE command in BASIC. Apparently you could overclock the video chip and cause it to melt... Also there was a game for early PCs called Welltris (3d Tetris, more or less). Its copy protection scheme asked the user questions, the answers to which were in the manual. I had a friend who lost his manual, or maybe just got sick of having to dig up the answers... so he loaded up the game binary in Turbo Debugger and patched around the routine that checks answers. It turns out the game would checksum its own binary, and if the checksum didn't match a hard-coded value, it would format your C: drive! Fortunately for him, he had backups... but I always wondered whether anyone ever got bit by this by accident. Maybe they had a virus that altered any executables it could find, or their drive developed a bad sector (never did check to see what happened in that case). Anyone remember the Atari 8-bit program Paperweight? -- B. Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://stella.biglist.com
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