[comp.sys.cbm] VIRUS ATTACK !!!

pwong@batcomputer.tn.cornell.edu (Patrick Wong) (09/21/89)

Hi, Commodoreans,

I had a strange experience yesterday with my C64 and 1541 combo :

I loaded a BASIC program into C64 (without no accessories attached except
the 1541) from the disk drive.  When I ran the program, it crashed at a
certain line.  So, I LISTed the line.  I was surprised that the program
line contained the correct program statement, plus a few other BASIC
program lines (not belonging to this program, perhaps from some other
BASIC program on the same diskette) occupying several screen lines !!!
So, I re-typed in the correct program line again and did a LIST.
Wow, the same set of unidentified program lines were attached to
the program line below the one just re-typed in !!!
Then, throughtout the nite I did several hard reset of the C64 (powering
it down and up) and loaded the same program each time.  Each time
I found those extra lines and even other unidentified
extra lines attached to the ends of the original program lines at
different locations of the program.  And, sometimes the last few
program lines of the original program were missing !  
In the end, after many resets I
successfully loaded the same program without anymore garbage.

So, what happened ?  If the disk drive is not clean, head is out of
alignment, diskette is corrupted, then re-typing in the correct
program lines into the program after it is loaded into the C64 memory
should have fixed the problem.  Since re-typing didn't fix the problem
does it mean that there is something wrong with my C64 and not the
1541 or the diskette ?

Please help !!!

Patrick Wong
pcw@squid.tn.cornell.edu
pwong@tcgould.tn.cornell.edu

news@tymix.UUCP (The News System) (09/22/89)

That  my best guess.  Good luck with it.
From: mikemo@opus.uucp (Mike Mo)
Path: opus!mikemo

/* Disclaimer:  McDonnell Douglas has nothing to do with my opinions          *//* Mike Mo                                                                    */
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