Jump to content
Sign in to follow this  
uridium

Zif Carrier Advice

Recommended Posts

G'day. Posted in Conquests.. probably should be here.

 

I've got a 7500/100 and a fair few G3 Zif cpu's around. Anyone recommend a zif carrier card to look out for and buy?

 

Anyone suggest where I could buy one from?

 

Best Wishes,

Al

Share this post


Link to post
Share on other sites

I'd say keep an eye out for the XLR8 MACh Carrier ZIF.  The site below is in French but it gives a pretty good rundown of the card and what it can do with the right CPU.  The limitations of the card (topping out around ~500MHz) are reasonable since you're probably not going to find a ZIF CPU, G3 or G4, any faster than that.

http://macbidouille.com/articles/test-de-la-carte-mach-carrier-mpe-de-xlr8/page1

Share this post


Link to post
Share on other sites

I don't think that any of the ZIF carriers actually have a CPU frequency limit.  There's a limit to have fast of a clock signal they can supply to the CPU, but what the CPU does with it afterwards (multipliers) won't be (entirely) controlled by the carrier card.

 

That said, that limitation was probably written by marketing, back when the top CPU:bus multiplier was 10:1.    So XLR8 figured, "well, we can supply a 50MHz clock, and the highest clock mulitplier is 10:1, so our top speed must be 500 MHz."   And the jumper/switch settings for the clock muiltiplier are on the carrier card.

 

The above does not reckon with the fact that later CPUs redefined some of the clock multiplier codes/pin settings to mean different, higher multiples, nor did it take into account the chips which are capable of a soft multiplier setting (PPC750fx, PPC750GX).

 

In my opinion XLR8 probably had the best, most developed carrier card technology, but ultimately, a carrier car is pretty simple.    It must supply a clock signal (generally between 40 and 50 MHz (although up to 65MHz can be useful), it must have onboard power regulation that honors voltage level pin settings from the ZIF, and it needs to have switches/jumpers to properly bias the CPU clock multiplier pins on the ZIF card.

 

PowerLogix made a smaller, simpler carrier card that seems solid.   I think Formac also sold one.  And NewerTech sold a few as well.

Share this post


Link to post
Share on other sites

Thanks guys :) Really appreciate the ideas.

 

Actually I have a 1.2ghz G3 I'm itching to try and a few slower ones.

 

Time to fire up google translate and see what it makes of the french site. :)

 

Thanks again!

Al.

Share this post


Link to post
Share on other sites
16 hours ago, defor said:

there were 1.2ghz g3 zifs?

 

Squared.   There were 1.2GHz G3 ZIFs???  I thought only PowerLogix made ones faster than 500 MHz and they topped out at 1.1 GHz, I thought...

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×