Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!cs.utexas.edu!rutgers!mcdchg!documail!rich From: rich@documail.UUCP (Rich McCallister) Newsgroups: comp.sys.amiga.hardware Subject: Re: A1000 bus noise woes Keywords: PALs? Message-ID: <343@documail.UUCP> Date: 26 Apr 91 19:58:59 GMT References: Reply-To: rich@documail.UUCP (Rich McCallister) Organization: Bell & Howell DocuMail Division, Evanston, Ill. Lines: 27 In article papp@remus.rutgers.edu (papp) writes: > >I have heard >that there are 2 different manufacturers of the PAL chips, and that >one of them is more reliable than the other. I believe mine are TI >chips. > >Would it help my situation if I replaced these chips with this other >manufacturer's chips? Are they even available anywhere? I didn't >remove the A1000 daughter board, so I'm not sure of this, but it >appears that the PALs are soldered directly on to the daughterboard. >Can I replace these myself? (i.e. desolder them, and maybe put sockets >in and put new PALs in? I am pretty comfortable with soldering irons) I wish I was more comfortable with them - I recently tried to replace the U6 PAL on a 1000 daughter board (to install a KwickStart) and failed. The machine no longer boots. 8-( As for the TI PAL's, I remember reading that the idea that certain PALs worked better than others was put forth by CLtd, but most others seemed to disagree, saying that while the grounding could really make a difference in noise, the differences between the various brands of PALs was in this case almost non-existant. Thus, I would doubt that that is the problem. Then again, I thought the PAL grounding was a likely cause, and have one out of action daughterboard to my credit, so what do I know?