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From: mlelstv@immd4.informatik.uni-erlangen.de (Michael van Elst )
Newsgroups: comp.sys.amiga
Subject: Re: A1000 hardware problems
Message-ID: <527@medusa.informatik.uni-erlangen.de>
Date: 4 Oct 89 13:26:24 GMT
References: <6SJM8NG.B.D88.R-WESTMAN@LINUS> <520@tw-rnd.SanDiego.NCR.COM>
Organization: IMMD IV, University of Erlangen, W-Germany
Lines: 27

johnl@tw-rnd.SanDiego.NCR.COM (John Lindwall) writes:

>In article <6SJM8NG.B.D88.R-WESTMAN@LINUS> D88.R-WESTMAN@LINUS.IDA.LiU.SE (Rickard Westman) writes:
>>Amiga 1000 with internal 256K expansion.  It does not have a daughter-board,
>>everything is on the motherboard.
>Wow! This is a new thing to me!  What type of hacks were performed to allow an
>A1000 with NO daughterboard?
>>[Much stuff deleted]
>>Is poor grounding typical for A1000's, even those without daughterboards?
>A1000's are famous for flaking out after more then one expansion device is
>connected.  Typical solutions include grounding the PALS or replacing the PALS.
>In your case (No PALS, I guess) I don't know what to suggest.  Good luck to
>you.

These A1000 (without daughterboards) came some time after they introduced
the PAL versions of the A1000. A had some bad and some good experiences
with it. The good is that all devices at the expansion connector work
better since the four PALs are now on the motherboard. Nevertheless,
since the 256k Kickstart RAM is on the motherboard too, there is more
noise on data/address lines as well as on the power supply.
I got some memory internal memory cards (sitting in the 68000 socket)
working when adding additional vcc and gnd lines between the power
supply connector and the 68000 socket.

				Michael van Elst

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