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From: monty@sagpd1
Newsgroups: comp.sys.amiga.hardware
Subject: Re: A1000 bus noise woes
Keywords: PALs?
Message-ID: <1991Apr25.163431.27@sagpd1>
Date: 25 Apr 91 16:34:31 GMT
References: <Apr.23.10.50.48.1991.9057@remus.rutgers.edu>
Reply-To: monty@sagpd1.UUCP (Monty Saine)
Organization: Scientific Atlanta, Government Products Div, San Diego, CA
Lines: 25

In article <Apr.23.10.50.48.1991.9057@remus.rutgers.edu> papp@remus.rutgers.edu (papp) writes:
>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)
>

    Be warned that the daughter board is a 4 layer board! If you are 
    not experinced with desoldering on multilayer boards you could
    very well destroy it ( and they tain't so easy to find anymore).
    In any case if you do replace the Pals get some "good" machined
    type sockets to put in the daughter board. Makes life much better
    in the future. 

    Another point to remember is the A1000's ground connections to the
    expansion bus were inadequate and sholud be re-enforced also. They
    are/were a cause for bus problems also.

    Lastly, terminate the bus after the last expansion device if possible.
    This does a lot towards making multiple expansions (and Lucas type
    addins) work better.

    Monty Saine