Broken Mac Accelerator
teoz at neo.rr.com
Sat Sep 9 00:31:41 CDT 2006
----- Original Message -----
From: "Don" <THX1138 at dakotacom.net>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Saturday, September 09, 2006 1:24 AM
Subject: Re: Broken Mac Accelerator
> Teo Zenios wrote:
> > My latest acquisition came in today, a Mac IIci, that I wanted to use as
an OS 6.08 machine with a Daystar Turbo 040 (68040/33) accelerator. Anyway
after cleaning up the system and installing the OS I put the card in and
loaded the drivers and all was fine (very fast booting). After about 15
minutes I had to reboot for driver update and the system would just bomb
during boot (about where the control panel for the Daystar card would want
to load). I took the card out and notice there was a capacitor missing on
the back with a nasty looking black burn mark. So I started looking around
inside for the burn metal part and notice I did not smell or see smoke or
little capacitor parts (its a surface mount with no numbers on it). Doing a
little digging in my picture archive I verified that the card which I have
never used before (which is why I wanted a IIci since it works in that
model) was sent to me in this condition.
> > So what I want to know is how the thing functioned at all without the
cap (burnt carbon acted as a capacitor in some way)? and what caused it to
> > If anybody have an original Daystar Turbo 040 33Mhz card with the cache
on a separate board could you let me know (if possible) what value C54 s
supposed to be? The cap looks to be tied into one or two legs of the
oscillator chip that controls the CPU (Ecliptek EC1100 16.667Mhz 93-10).
> > I kind of want this working again since it will be a long time before I
find another one at a great price.
> Not sure of what you have (nor what *I* have!) :<
> But, I found a couple of Daystar cards in my Mac pile.
> Some are 030. I found an 040 that claims to be a "Turbo 040"
> (written in the solder side foil layer on the corner of the
> card furthest from the 040). The 040 seems to be a 33MHz part
> so I will *assume* this is at least SIMILAR to what you're looking
> However, last used C seems to be C49 -- located on the solder
> side between the CPU and the DIN connector. <frown> Perhaps
> a different revision?
There was an early and a later board. The early part had the cache (128K I
believe) on a separate board that connected to the top backside), the later
parts had less chips but had no daughterboard since the cache was moved to
the main board.
The front of mine looks like this:
Later version is this one:
There are 33Mhz and 40Mhz versions (68040), probably differing only in
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