jeff@eng.umd.edu (Jeffrey Frey) (01/05/91)
Our C64, hooked up to a color TV through the built-in video modulator, has stopped sending letters to the screen. On power-up there's video (a uniformly blue TV screen, no snow or other noise) but none of the power-on messages, like "READY". Probably the dreaaded static electricity which tends to destroy our C64 every year at this time (the kids WON'T learn to touch the grounding wire) has murdered another chip. Anyone have an idea on which one it might be, or what alternative explanation there might mbe? Jeff
treesh@bach.helios.nd.edu (01/05/91)
Since your getting a nice blue color on your screen, but no power on message, I would start with swapping out the BASIC and then KERNAL rom chips. If that wont do it, try PLA and 6510 next. ctfm
llaria@cup.portal.com (Tracy M Wirs) (01/05/91)
that happened to me once....... and it turned out that the chip for the space bar had fried. The best thing to do is to get that machine to a repair shop. another possibility: your power source has gone kaput. try another power source (preferably a new one) and rule out this possibility before anything else....... llaria@cup.portal.com <internet> sun!cup.portal.com!llaria <uucp>
Patrick_Andreas_Maher@cup.portal.com (01/08/91)
Your problem is the 6526 chip most likely. The chip controls all the outputs. The chip it located on the far left side. You can pick up your C64 and look where the modem goes and see the two chips. When you touch the joystick ports and get a little shock the first place it goes is to those chips. The one on the far left is the first one to go out. I have had this happen to my C64 and to my C128. When it happened on my C64 I got alot of weird characters on my screen when I powered up and some of the keyboard did not work. On my C128 the joystick port 2 did not work correctly. So, most of the time it will be this chip. The chip runs around 12.95 plus shiping from a lot of dealers. You can check out most of the Commodore magazines like RUN or whatever and look in the back of the magazines for there