TF2040 Design Complete

News & updates for the upcoming 68060 accelerator

Moderators: terriblefire, Terriblefire Moderator

User avatar
mrbombermillzy
Posts: 1441
Joined: Sun Jun 03, 2018 7:37 pm

Re: TF2040 Design Complete

Post by mrbombermillzy »

terriblefire wrote: Wed Jul 06, 2022 2:24 pm @Daedalus tells me that the board has 2 x Zorro slots and a mirror of the A500 slot.
It's got a passthrough slot for the original A500 zorro (hence the slot gender changer wafer) and a *ahem* 'fully A2000 compatible' Z2 slot.

And I would be running it in a Checkmate 1500 plus case too, which this card was built to be used in.
terriblefire
Moderator Team
Moderator Team
Posts: 5368
Joined: Mon Aug 28, 2017 10:56 pm
Location: Glasgow, UK

Re: TF2040 Design Complete

Post by terriblefire »

mrbombermillzy wrote: Wed Jul 06, 2022 2:39 pm
terriblefire wrote: Wed Jul 06, 2022 2:24 pm @Daedalus tells me that the board has 2 x Zorro slots and a mirror of the A500 slot.
It's got a passthrough slot for the original A500 zorro (hence the slot gender changer wafer) and a *ahem* 'fully A2000 compatible' Z2 slot.

And I would be running it in a Checkmate 1500 plus case too, which this card was built to be used in.
Yes but the pinout is completely different between the A500 edge slot and the A2000 cpu slot. They have mostly the same signals but different arrangement. Apparently this wasnt an issue before now as no A2000 cpu card was small enough to fit.

Basically dont try this or you'll end up killing things.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
User avatar
alexh
Posts: 698
Joined: Tue Oct 17, 2017 4:51 pm
Location: Oxfordshire

Re: TF2040 Design Complete

Post by alexh »

terriblefire wrote: Wed Jul 06, 2022 2:24 pm The price of 040s is making them attractive now. Although i'm sure that will soon change.
MC68040FE33V parts look like they are available dirt cheap as little as ~£18 each. They are QFP parts though so it would mean a different layout just for these parts.
Principal ASIC Engineer - SystemVerilog, VHDL
Thalion Webshrine - http://thalion.atari.org
STf,STfm,STe,MegaST,MegaSTe,Falcon060
A500+,A600,A4000/060,CD32,CDTV
terriblefire
Moderator Team
Moderator Team
Posts: 5368
Joined: Mon Aug 28, 2017 10:56 pm
Location: Glasgow, UK

Re: TF2040 Design Complete

Post by terriblefire »

alexh wrote: Wed Jul 06, 2022 2:46 pm
terriblefire wrote: Wed Jul 06, 2022 2:24 pm The price of 040s is making them attractive now. Although i'm sure that will soon change.
MC68040FE33C parts look like they are available dirt cheap as little as ~£18 each. They are QFP parts though so it would mean a different layout just for these parts.
Maybe @go0se can design a 040 socket that can take the QPF and adapt it
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
User avatar
mrbombermillzy
Posts: 1441
Joined: Sun Jun 03, 2018 7:37 pm

Re: TF2040 Design Complete

Post by mrbombermillzy »

terriblefire wrote: Wed Jul 06, 2022 2:46 pm Yes but the pinout is completely different between the A500 edge slot and the A2000 cpu slot. They have mostly the same signals but different arrangement. Apparently this wasnt an issue before now as no A2000 cpu card was small enough to fit.

Basically dont try this or you'll end up killing things.
Fair enough. I will take this as a big NO then! Thanks. :D
terriblefire
Moderator Team
Moderator Team
Posts: 5368
Joined: Mon Aug 28, 2017 10:56 pm
Location: Glasgow, UK

Re: TF2040 Design Complete

Post by terriblefire »

mrbombermillzy wrote: Wed Jul 06, 2022 2:50 pm Fair enough. I will take this as a big NO then! Thanks. :D
Erm it might work looking at it again... a passive adaptor might be fine. But i really hate commenting on alternate uses for something i've not even got working in its standard use case.
———
"It is not necessarily a supply voltage at no load, but the amount of current it can provide when touched that
indicates how much hurting you shall receive."
User avatar
alexh
Posts: 698
Joined: Tue Oct 17, 2017 4:51 pm
Location: Oxfordshire

Re: TF2040 Design Complete

Post by alexh »

terriblefire wrote: Wed Jul 06, 2022 2:49 pm
alexh wrote: Wed Jul 06, 2022 2:46 pm
MC68040FE33C parts look like they are available dirt cheap as little as ~£18 each. They are QFP parts though so it would mean a different layout just for these parts.
Maybe @go0se can design a 040 socket that can take the QPF and adapt it
Nice

FYI that was a typo, should have been MC68040FE33V. I can see why they are cheaper. The "V" means are 3.3V rather than "A" which is 5V. Must make them less desirable for classic computer users who presumably all need 5V versions.
Principal ASIC Engineer - SystemVerilog, VHDL
Thalion Webshrine - http://thalion.atari.org
STf,STfm,STe,MegaST,MegaSTe,Falcon060
A500+,A600,A4000/060,CD32,CDTV
User avatar
mrbombermillzy
Posts: 1441
Joined: Sun Jun 03, 2018 7:37 pm

Re: TF2040 Design Complete

Post by mrbombermillzy »

@terriblefire
I completely understand your POV.
No worries.

Maybe if someone has built one by the time the computer show is on, brings it along and is brave enough to try it out on my machine, we will get the definitive answer? :lol: :twisted:
User avatar
mrbombermillzy
Posts: 1441
Joined: Sun Jun 03, 2018 7:37 pm

Re: TF2040 Design Complete

Post by mrbombermillzy »

alexh wrote: Wed Jul 06, 2022 3:03 pm FYI that was a typo, should have been MC68040FE33V. I can see why they are cheaper. The "V" means are 3.3V rather than "A" which is 5V. Must make them less desirable for classic computer users who presumably all need 5V versions.
Wouldn't a lower voltage translate to lower heat/more overclock potential though'?
User avatar
Daedalus
Posts: 15
Joined: Wed Mar 27, 2019 10:59 pm
Location: Glasgow, Scotland
Contact:

Re: TF2040 Design Complete

Post by Daedalus »

You rang? :)

Right, I'll give some definitive answers here. The Checkmate board adds a Zorro-II slot, but it's not totally A2000 compatible as it lacks DMA arbitration logic. DMA will still work for one device so long as there's nothing else on the CPU bus that can also do DMA, and that will be 24-bit only so any 32-bit accelerator RAM is out for that DMA anyway. Autoconfig is there and works both on the Zorro-II slot and the A500 passthrough slot, with the Zorro-II slot being first in the chain.

The A500's side port is pretty much identical to the *original* A2000 CPU slot, but the B2000 slot added some extra bus arbitration functionality, e.g. the necessary logic to disable the motherboard CPU. The A500 (and therefore the Checkmate board) doesn't have this logic, so you'd probably have to remove the onboard CPU for it to work, or else add that logic on an adaptor board as A2000 accelerators would probably make use of this functionality.

But the biggest thing to consider is that the pins on the Checkmate A500 passthrough slot are mirrored. You'd need any adaptor board to take that into account, otherwise plugging an A2000 accelerator into the slot will connect pin 1-2, pin 2-1, pin 9-10, pin 10-9 and so on, which will likely let the magic smoke out of whatever gets 12V in through a clock line. As terriblefire said, this wasn't considered an issue at the time because A2000 accelerators were much too big to fit in the Checkmate case, but hey ho :)
Post Reply

Return to “TF360”