Re: Buggie powersupply doesn't like RamFAST w/1MB

[wbaguhn@nyx10.cs.du.edu (Will Baguhn)]

In article <16JUL199603025637@vax2.concordia.ca>,
Mitchell Spector <spec@vax2.concordia.ca> wrote:
>   This is very odd, I hope someone can figure this one out. Tonight I
>replaced my stock Apple 60W supply with one of Stephen Buggie's 150W
>adapted PC powersupplies. To make this brief, as soon as I switch on
>my IIgs, the RamFAST reports "Fatal Memory Error =09" and refuses to
>operate (even if I try a warm-boot or invoke the GS self-test). Around
>9 out of 10 times this happens, if I keep switching the main power on
>and off, *eventually* the RamFAST starts up my hardrive and everything
>runs normally. I've run the 'RFTEST.SYSTEM' diagnostic program and copied
>files from different partitions, the 1MB of cache is fine.
>
>   As soon as I return my stock 60W Apple supply, the RamFAST no longer
>has this problem. It works perfectly 10 out of 10 times when I switch
>on the power. Interestingly enough, I think it's the 1MB of cache
>configuration, since switching in a 256K cache RamFAST doesn't seem to
>have this problem. Why would a higher powered supply affect a 1MB cache
>board and not a 256K cache board? Or rather why should it affect my
>RF at all?
>
>I certainly can't go on like this, cycling my power-switch a dozen or
>so times every time I start my system. Can someone come up with a reason
>as to WHY the Buggie supply is messing up my 1MB RamFAST?
>
>Mitchell Spector
>spec@vax2.concordia.ca

Check the voltages on the Buggie 150W.  They may not be quite what
the RAMFast D expects, but close enough for the other RAMFast.  Use a 
DMM and compare the +5V supplies...
-- 
                                      --- Rev. SPQR (wbaguhn@nyx.net)