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[billt]

Tahoe reminds me about the Zorro busmaser issue. Is there a list of all cards capable of this busmastering, which could conflict with each other? Is this a Zorro3 issue only, or also Zorro2? (Are there Zorro2 busmaster cards?)

[Heiroglyph]

It's a Buster Zorro3 issue.

I don't have a list, but off the top of my head:
A4091
A4000T SCSI (onboard 4091)
Deneb
Fastlane Z3
DKB 4091

There are Zorro2 busmasters, but I'm not aware of specific problems. I think these just work like normal 68000 busmasters which were pretty well understood.

[Zac67]

Zorro II busmastering is no problem at all, regardless of the number of cards. Fat Buster's design was never really finished.

[freqmax]

There is in other words no fully working Zorro-3 implementation, ever from Commodore?

[Gulliver]

Originally Posted by freqmax

There is in other words no fully working Zorro-3 implementation, ever from Commodore?

I ´ve read somewhere that Dave Haynie due to Commodre´s bankrupcy never finished debugging Buster chip adequately. So the best you can get is a Buster revision 11, which still fails under some circumstances.

[freqmax]

The Zorro-3 standard is alright, just not the Buster implementation?

(if so then an FPGA might fix the issue)

[Zac67]

Sadly, yes.

[billt]

Originally Posted by freqmax

The Zorro-3 standard is alright, just not the Buster implementation?

(if so then an FPGA might fix the issue)

That's kindof why I asked. Expect it to take forever though as time is hard to come by and I have an even more exciting project ongoing.
http://opencores.org/project,zorro_to_wishbone_bridge

[tone007]

[billt]

Awesome Zorro bus picture!

[mechy]

Buster 9 handled multiple bus masters ok if i remember correctly,it had other issues, where as buster 11 had troubles with multiple bus masters.

also the Picasso IV and Zoram belong on the busmaster list i think.

Mech

[Zac67]

also the Picasso IV and Zoram belong on the busmaster list i think.

Don't think they take busmastership though, just Z3 slaves.

[freqmax]

How many gates does the Buster contain approximately?

[billt]

Originally Posted by freqmax

How many gates does the Buster contain approximately?

Dave would probably have to try and remember such a thing.

Should fit into an FPGA pretty easily today and have lots of space left over.

[freqmax]

If die size and scale is known. An estimate can be done. It's not just a question of if it can be done. But which FPGA model to choose. Logic capacity, tools, I/O capabiltities and chip package are intertwined.