Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!cica!tut.cis.ohio-state.edu!purdue!mentor.cc.purdue.edu!pur-ee!pur-phy!tippy!bah From: bah@tippy.uucp Newsgroups: comp.sys.cbm Subject: Re: C64 Problem Message-ID: <24100019@tippy> Date: 9 Nov 89 03:37:00 GMT References: <9704@max.u.washington.edu> Lines: 8 Nf-ID: #R:max.u.washington.edu:9704:tippy:24100019:000:378 Nf-From: tippy.uucp!bah Nov 8 22:37:00 1989 I think what Mike means is PLA chip, U17. This is most often the culprit for problems like yours. It will also often cause a blank screen at power-up. This chip selects the basic, kernel, and char. gen. roms, so when it goes bad, a multitude of symptoms can develop. But the ones described above are by far the most common. Bob Hahn tippy!bah@newton.physics.purdue.edu