Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!mips!dimacs.rutgers.edu!aramis.rutgers.edu!remus.rutgers.edu!papp From: papp@remus.rutgers.edu (papp) Newsgroups: comp.sys.amiga.hardware Subject: A1000 bus noise woes Keywords: PALs? Message-ID: Date: 23 Apr 91 14:50:49 GMT Organization: Rutgers Univ., New Brunswick, N.J. Lines: 36 Thanks for all the replys about how to ground the A1000 PALs... I opened up my A1000 and found that they had already been grounded! I strengthened up the solder connections, and put it back together. I still cannot successfully get 2 devices to work on my 1000 bus. I am using an Expansion Technologies Escort 2 with 2 megs of memory, and a hard drive controller. (I have both a CLtd. controller and the Exp. Tech SOTS controller.) No pair of these devices works. The computer makes it through kickstart, and sometime even makes it to the workbech. However, the machine crashes almost immediately after this. (Sometimes right away, sometime a minute or so later) 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) Or is there another problem possibly that I am overlooking? One more note... The time taken for the system to crash increased as I continually tested different combinations of devices (heat increase?) All devices work properly by themselves... just not in pairs... And finally, after all crashes, the computer required Kickstart again, not just workbench. Any help on this situation would be greatly appreciated! Thanks, -Al papp@remus.rutgers.edu