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From: ckp@grebyn.com (Checkpoint Technologies)
Newsgroups: comp.sys.amiga.misc
Subject: Re: Amiga motherboard dimensions
Message-ID: <1991May3.123700.21862@grebyn.com>
Date: 3 May 91 12:37:00 GMT
References: <1991Apr30.143013.20317@grebyn.com> <1189@cbmger.UUCP>
Organization: Grebyn Timesharing
Lines: 29

In article <1189@cbmger.UUCP> peterk@cbmger.UUCP (Peter Kittel GERMANY) writes:
>In article <1991Apr30.143013.20317@grebyn.com> ckp@grebyn.com (Checkpoint Technologies) writes:
>>
>>It would sure be nice if Commodore would make the Amiga motherboard to
>>the same form factor and mount points as the standard PC motherboard,
>                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>and then stick to it.
>
>Sorry, never seen such a beast. Every motherboard I see is of different
>size. Just look through PC magazines like Byte (:-) for all those
>Taiwanese ads for pure boards, they all differ.

Some people I know and respect say differently. And I just built myself
a 386 machine from the case and motherboard separately.  So I'd say
that, even if there really isn't a hard standard, there's one popular
enough to do the job.

>Though the rest of your idea sounds appaling (sp?), please remember
>that also the power supplies of Amigas are *slightly* different from
>standard PC ones, they must provide that Tick signal.

There's a motherboard jumper on the A2000 that takes the tick signal
from the video timing. And, since this would be a new motherboard,
I'm sure circuitry could be added to provide a good stable 60Hz,
one which aviods the problems the video 60Hz would cause (since it's
actually 59.99.. Hz, and since it follows a genlock).
-- 
Richard Krehbiel, private citizen      ckp@grebyn.com
(Who needs a fancy .signature?)