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The Commodore 64 never had a virus

The Commodore 64 never had a virus.  I knew I had a clean machine when I turned it on.  Is having the operating system in RAM better than having the operating system in ROM in modern computers?  The Commodore 64 had array memory whereas more modern computers have libraries and other points of infection.
 
Someone made a trojan for the Commodore 64 whereas a program tried to format the disk but if you turned off the drive or had a write protect tab on your disk, nothing could happen.  The fact that commodore hard drives were intelligent hard drives meant that hardware controlled the action instead of viruses controlling the action.  Besides, there really wasn't a whole lot of memory in them to cause a virus (2K of memory).
 
 

There were programs that were

There were programs that were destructive, there was a Winter Olympics II game that used to sit in a loop writing to the read only memory in the 1541, unfortunately the designer of the 1541 did not qualify the select logic with R/W line and so it would contend until it got hot, and get hot enough it would ruin the chip.

The other Trojan we had would make the stepper motors in the 1541 buzz out the song "anchors away" or some similar song.
 
Bil

Re: The Commodore 64 never had a virus

Bil Herd worte:

> ...Winter Olympics II game that used to sit in a loop writing to the read only memory in the 1541, unfortunately the designer of the 1541 did not qualify the select logic with R/W
> line and so it would contend until it got hot, and get hot enough it would ruin the chip.

Heck, I didn't know about that bit of hardware destruction. So, does that mean the 1571 is impervious to that Winter Olympics II code?

Truly,
Robert Bernardo
Fresno Commodore User Group
http://videocam.net.au/fcug
The Other Group of Amigoids
http://www.calweb.com/~rabel1/
Southern California Commodore & Amiga Network
http://www.sccaners.org

64 virus

The 64 had a few trojan horses that would erase your disk, they were extremely rare.
Most of the stuff I saw was just harmless pictures.
Way back in the end days when everyone was giving their C64's and software away I saved every disk and eventually ran a virus checking software on them. I found 3 infected disks out of thousands I had checked.

8 bits is all one needs

There existed a few true

There existed a few true viruses for C64:
 
http://www.securelist.com/en/blog/208187468/The_C64_hits_25
http://hitmen.c02.at/files/docs/c64/C64_Virus_List.txt
 
Some of those viruses were reset resident, either by using the CBM reset vectors or in case of the H.I.V.-Virus by being resident in the drive RAM, so that even clearing C64 RAM or overriding it's reset vectors (fast load carts etc) was not enough to stop it.
 

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