Thanks for appearing with some solid info!Daedalus wrote: ↑Wed Jul 06, 2022 3:29 pm You rang?
.....
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
TF2040 Design Complete
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- mrbombermillzy
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Re: TF2040 Design Complete
Re: TF2040 Design Complete
Upside down is a given for any cards using that slot, but it's also mirrored by design since there was a possibility of having that passthrough board permanently connected to the busboard. We went with the socket in the end, but the reversed pins remained. Pin 1 of the passthrough is at the bottom right of the slot, whereas pin 1 of the Zorro slot is at the top right. So I guess you could call it a death to all slot, yes It's why the warnings are on the board and in the manual to only use the provided adaptor board in that slot. I haven't heard of anyone trying to use an A2000 chip RAM expansion in the slot (they're generally pretty rare anyway since they're only really applicable to the original German A2000), but that probably wouldn't end well for the card...
- mrbombermillzy
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Re: TF2040 Design Complete
@Daedalus :It took me a few goes to get the orientation right in my mind, after posting earlier!
But, yeah, I guess not many people attempting to do anything like this anyway, so not a big problem with flaming A500 side slots, eh?
I guess we can just lay it to rest now.
Thanks again for chipping in with the details.
But, yeah, I guess not many people attempting to do anything like this anyway, so not a big problem with flaming A500 side slots, eh?
I guess we can just lay it to rest now.
Thanks again for chipping in with the details.
Re: TF2040 Design Complete
Yes. But the FE (QFP) package is probably not as good with heat as the RC (PGA) package.mrbombermillzy wrote: ↑Wed Jul 06, 2022 3:17 pmWouldn't a lower voltage translate to lower heat/more overclock potential though'?
But they did make MC68040RC40V. I can only see them for sale direct from NXP / resellers for approx $250
Principal ASIC Engineer - SystemVerilog, VHDL
Thalion Webshrine - http://thalion.atari.org
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A500+,A600,A4000/060,CD32,CDTV
Thalion Webshrine - http://thalion.atari.org
STf,STfm,STe,MegaST,MegaSTe,Falcon060
A500+,A600,A4000/060,CD32,CDTV
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Re: TF2040 Design Complete
The CPU core voltage is flexible on the TF2040. Set it to whatever you need.
You can use a 6-8 layer board for the adaptor and some heat paste under the CPU when you solder it down to dissipate some heat. You also have the possibility of building a cooling system onto the adaptor.
———
"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."
"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."
Re: TF2040 Design Complete
Stephen, probably somebody has asked but would you consider doing a 'long PCB' version of the card. The extra bit would just be for support (and I guess mounting an SSD or something (or a Hard Drive ) and wouldn't have any circuitry on it in my mind.
Kindest regards
Luke
Kindest regards
Luke
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Re: TF2040 Design Complete
This goes against the general TF philosophy of make it as cheap as possible by default. I've also zero interest in having a second version of the card that ends up having different issues from the first one. Unlikely bit i'm not taking the chance...Lukya wrote: ↑Mon Jul 11, 2022 12:09 pm Stephen, probably somebody has asked but would you consider doing a 'long PCB' version of the card. The extra bit would just be for support (and I guess mounting an SSD or something (or a Hard Drive ) and wouldn't have any circuitry on it in my mind.
Kindest regards
Luke
Remember KEEP IT SIMPLE is the rule i go by. Thats why suggestions for extras are often knocked back.
But i could add mounting holes so something could be bolted there with a bracket I guess. thats as far as i'm prepared to go in terms of extras.
———
"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."
"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."
Re: TF2040 Design Complete
That would be great Stephen (the holes idea) - them someone can come up with a 3d printed frame etc.
Kindest regards
Luke
Kindest regards
Luke
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Re: TF2040 Design Complete
Keep in mind this is a rev0... which basically means pure prototype.
I know there are people out there who turn their noses up at Gayle emulation etc etc.
But the idea of these cards is that they can be manufactured and repair in perpetuity. I never claimed to make the bestest ever cards.
———
"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."
"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."
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Re: TF2040 Design Complete
Ah man... I know y'all like this but when one of these pops in brand new i get a sinking feeling that I have a lot of work ahead of me.
———
"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."
"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."