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Path: utzoo!watmath!clyde!caip!cbmvax!daveh
From: daveh@cbmvax.cbm.UUCP (Dave Haynie)
Newsgroups: net.micro.amiga
Subject: Re: Re: Fraud And Deceit In The Memory Board Market
Message-ID: <504@cbmvax.cbmvax.cbm.UUCP>
Date: Wed, 9-Jul-86 15:13:13 EDT
Article-I.D.: cbmvax.504
Posted: Wed Jul  9 15:13:13 1986
Date-Received: Fri, 11-Jul-86 05:17:46 EDT
References: <1400@well.UUCP>
Organization: Commodore Technology, West Chester, PA
Lines: 37

> What does CardCo suggest as to how many cards can be added after the CardCo
> RAM card? Related question: how much current does the board draw? Are there
> any by-pass capacitors on the board? By-Pass cap supress noise but drive the
> cost of the board (more holes to drill) up (plus the cost of the caps). Many
> would argue, however, that having them (one or two per ram chip) is worth 
> while.
> 
> Perry S. Kivolowitz

Last I heard, CardCo was claiming that 2 boards could be used without 
exceeding 1 Amp.  This was based on the use of some CMOS parts, and probably
refreshing several RAM banks at separate time to keep down the peak power
requirements.  I can't imagine anyone producting a RAM board (or any
computer board, for that matter) without bypass caps.  The extra costs fo
PC board is negligable, at least when you've got a machine making all
your boards, as most anyone marketing large quantities of a product will.
At least one bypass cap per chip is good, though often a few more will
be required to pass FCC requirements.  Since the CardCo board has a bus
feedthrough, its FCC requirements will be more stringent, since they'll
have to pass with something connected to the extender.  The cost of good
0.1uF or 0.22uF bypass caps these days is about 2 cents a piece or less, 
so for a 1 Meg board you'd pay around 80 cents or so.  I sure HOPE any
manufacturer considers this mandatory; if they don't, they deserve
doom.

-- 
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Dave Haynie    {caip,ihnp4,allegra,seismo}!cbmvax!daveh

	"I don't feel safe in this world no more, 
	 I don't want to die in a nuclear war,
	 I want to sail away to a distant shore
	 And live like an ape man."
				-The Kinks

	These opinions are my own, though for a small fee they be yours too.
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