On Wed, 5 Dec 2001, Martijn van Buul wrote: > Daniele Gratteri wrote: > > Well, he said he has got a Commodore 16 that worked like a charm for many > > years but now, when powered up, it shows only garbage on the screen, mainly > > "@" chars. > > Seems like a stuck bit 0 to me. Wasn't screencode 0x01 '@', versus 0x00 ' ' ? If you're thinking about space (screen code 0x20) versus @ (screen code 0x00), it would be bit 5 that is permanently zero. > I'd hint for broken RAM. Me too. But it can also be outside of the screen area. If a byte in the stack area ($100-$1ff) is broken, any RTS or RTI instruction can fail badly and crash the machine before the initialization is completed. Marko Message was sent through the cbm-hackers mailing list
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