Jump to content
AlpineRaven

Carrera040 in Daystar adapter?

Recommended Posts

Evening all, 

I have MicroMac's Carrera040 CPU card and thought would Daystar Nubus adapter/pass through would work in Macintosh IIsi for the Carrera040 to work - would that work?

 

I don't have MicroMac's actual adapter (the seller lost it) but I have the CPU and I would like to use it in Macintosh IIsi.


Cheers

AP

Share this post


Link to post
Share on other sites

Are the cards wired the same?

 

My gut reaction would be if they're not compatible with the Twinspark, they're probably not compatible with the Daystar adapter. But I'd lean on the more savvy members for their say.

 

Screenshot_20190413-071509.thumb.png.001f60952cc9b2f71ba2b9491c59cad3.png

Share this post


Link to post
Share on other sites

Generally cache cards (Daystar, Carrera, etc) all need CACHE-slot adapters, that is clearly marked cache (and in some later adapters are marked accelerator). Any other type of slot adapter (nubus/pds) would be bad, very bad. (The term cache is confusing, but that applies to all upgrade cards including the cache-only ones.)

 

You could use any adapter that had a proper cache slot with any cache card, for example a Daystar card in a MicroMac adapter, or a Sonnet Card in a TwinSpark. I have used a few interchangeably with no issues. 

 

The only exception was the Turbo 601 that needed a special IIsi only adapter that  iirc had a single cache slot. 

Edited by omidimo

Share this post


Link to post
Share on other sites

Carrera 040 won’t work in a Twinspark adapter. It might work in a Daystar adapter but I would have to check that again. /BR, /BG and /BGACK are wired differently on Daystar, Twinspark and Micromac/Sonnet/Mobius adapters.

 

The Daystar 040 can do it’s job without an onboard 030, all the other 040 accelerators need a 030 to work. The Twinspark disables the onboard 030 by just pulling /BR to ground.

The Daystar adapter activates /BR once the accelerator sends the CPUDIS signal that normally is only present on the IIci cache slot and tells the host machine that another CPU takes over the bus without any further negotiation.

 

Guess I’ll give it a try and see what happens with the Daystar adapter and Micromac 040 combination. If the Micromac sends CPUDIS as well it might work. If not you could still modify a Daystar adapter.

Share this post


Link to post
Share on other sites
1 hour ago, Bolle said:

Guess I’ll give it a try and see what happens with the Daystar adapter and Micromac 040 combination. If the Micromac sends CPUDIS as well it might work. If not you could still modify a Daystar adapter.

I am interested to see if this works. I'd give this a try however my IIsi board is dead at the moment );

 

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

×