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- Path: crux4.cit.cornell.edu!fkrj
- From: fkrj@crux4.cit.cornell.edu (Benjamin Kenobi)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Cybervision, Busters, CPU boards etc.
- Date: 12 Jan 1996 13:54:52 GMT
- Organization: Cornell University
- Sender: do12@cornell.edu (Verified)
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- Matthias Meixner (meixner@rbg.informatik.th-darmstadt.de) wrote:
- : Benjamin Kenobi (fkrj@crux4.cit.cornell.edu) wrote:
-
- : : Hmm I have Buster09 and Rev3.0 and I get occasional gurus 8000 0004 while I
- : : am running under intuition but not much trouble at all under shapeshifter.
- : : I suspect that the problem is resulting from the fact that I have both of
- : : these problems and that if I fix one of them the problem will go away. Right
- : : now I really don't know what the problem is except that I have removed every
- : : software patch that I can find and the problem still exists to the point where
- : : I can't regularly use it.
-
- : You have to replace the 74FCT244 which can be found under you CPU-board
- : with a 74FCT240. The Rev. 3.0 CPU-board inverts a signal, that should not
- : be inverted, and the 74FCT240 inverts it a second time, and the problem
- : should go away.
-
- I have heard this fix mentioned several places, but it is not mentioned
- in the A4000 hardware guide or in Dave Haynie's definitive buster article
- which also appeared in that guide. Does replacing this chip fix the same
- thing as the cut and jumper modification which upgrades the A3640 to rev 3.1?
- What I'd like to know is if this problem/modifcation is related to the
- problems that are fixed by upgrading the A3640 from 3.0 -> 3.1 -> 3.2, or
- if it is an entirely different problem that only manifests itself when
- certain expansion cards are present (i.e. the CV64).
-
- Thanks,
- Dan Oberlin
-
- -----------------------------------------------------------------------------
- ___
- //// "Hey Joe, bring me that crowbar, will ya? I can't seem to
- ___ //// get my disk out of this MAC!"
- \\\\ ////
- \\\////
- \\\\/ AMIGA 4000/040 Intel outside, /\/\otorola within.
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