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 stop working.
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
for...
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?