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From: plav@cup.portal.com (Rick M Plavnicky)
Newsgroups: comp.sys.amiga.misc
Subject: Re: Amiga motherboard dimensions
Message-ID: <41995@cup.portal.com>
Date: 4 May 91 15:06:07 GMT
References: <1991Apr30.143013.20317@grebyn.com> <1189@cbmger.UUCP>
  <1991May3.123700.21862@grebyn.com>
Organization: The Portal System (TM)
Lines: 25

ckp@grebyn.com (Checkpoint Technologies) writes:

>In article <1189@cbmger.UUCP> peterk@cbmger.UUCP (Peter Kittel GERMANY)
>writes:

>>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).

Don't forget that if one decides to use that motherboard jumper (J300)
then the A2320 Display Enhancer will be practically unusable.  To quote
the manual: "The A2320 may not operate correctly if the vertical sync
pulse is used as the CIA time base, with the jumper in the right-hand
position."

>Richard Krehbiel, private citizen      ckp@grebyn.com
>(Who needs a fancy .signature?)

/* Rick Plavnicky ...!sun!cup.portal.com!plav  -or-  plav@cup.portal.com */