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From: straka@ihlpf.UUCP
Newsgroups: comp.sys.mac
Subject: Re: 512KE Accelerators?
Message-ID: <2068@ihlpf.ATT.COM>
Date: Mon, 31-Aug-87 09:46:19 EDT
Article-I.D.: ihlpf.2068
Posted: Mon Aug 31 09:46:19 1987
Date-Received: Tue, 1-Sep-87 04:50:43 EDT
References: <16195@teknowledge-vaxc.ARPA>
Reply-To: straka@ihlpf.UUCP (55223-Straka,R.J.)
Organization: AT&T Bell Laboratories - Naperville, Illinois
Lines: 22
Keywords: prodigy radius jump orion turbomax novy ryad etc.

In article <16195@teknowledge-vaxc.ARPA> mkhaw@teknowledge-vaxc.ARPA (Mike Khaw) writes:
>2) I have a 512KE which is an upgrade from one of the early 128K Macs,
>   so I'm concerned that its power supply isn't up to memory-expansion
>   and/or accelerator boards -- so I'm more interested in ones that add
>   a power supply.  Of the ones I know about, only Levco's Prodigy (Prime?),

I also have one of the early Macs.  I can only get my power supply up to
~4.8V (with 1Meg, homebrew) before it folds back.  I COULD go to my
dealer for a power supply repair (read: swap) and hope for a stiffer
one, but I won't until it would really be worth the ~$100.

I would really like to add an external 5V supply to my Mac (yes, I know
it's an UGLY thought).  However, I don't know if any power supply
sequencing rules apply.  But perhaps there aren't any to speak of (with
the power supply oscillating wildly at ~2Hz between supplying current
and foldback, no Mac I am aware of has incurred any damage). 

Any comments from hardware hackers out there?
-- 
Rich Straka     ihnp4!ihlpf!straka

Advice for the day: "MSDOS - just say no."