CPU clock of A540

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#828

From: Matthias Sattler
Date: Tue, 05 Jan 1993 12:49

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A few days ago, I tried to increase the CPU clock of my A540. But I encountered
a strange phenomenon. The computer boots until the message RISC OS .... then
the cursor stops flashing and the A540 obviously crashes. BUT when I press
reset now the computer enters the desktop happily and works fine??!!!
I can't even run the ARM at 30 Mhz without having this problem......
But ALL A5000 I know run fine at 30 Mhz or even more and they only have the 
'bad' ARM3 (as the A540 have the selected good ones..).

(At the moment I use a 74F74 on the processor card to get the CPU clock, maybe
this is important. By the way, what is the 68ohm resistior between the 7474
and the ARM3 good for?)


Matthias Sattler
email: m_sattle@informatik.uni-kl.de

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Message-ID: <1993Jan5.134929@informatik.uni-kl.de>

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Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!howland.reston.ans.net!sol.ctr.columbia.edu!ira.uka.de!rz.uni-karlsruhe.de!stepsun.uni-kl.de!m_sattle
From: m_sattle@informatik.uni-kl.de (Matthias Sattler)
Subject: CPU clock of A540
Message-ID: <1993Jan5.134929@informatik.uni-kl.de>
Sender: news@rhrk.uni-kl.de
Organization: University of Kaiserslautern, Germany
Date: Tue, 5 Jan 1993 12:49:29 GMT
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