CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Information and news about the 68SEC000 64MHz booster.
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mrbombermillzy
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Post by mrbombermillzy »

It's great to see you back at work again, doing some good old boostin'. :lol:

This pushing up of clock speed does interest me...

I wonder how much faster this CPU package type of the 68k can reach (with all the capacitance/interfacing signal problems sorted, so it's just the limitations of the CPU itself manifesting) using progressively more extreme active cooling solutions and a nice dose of overvoltage?

Can't wait to see how far you get with this. Keep up the great work! :dualthumbup:
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exxos
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Post by exxos »

mrbombermillzy wrote: Tue Mar 22, 2022 2:37 pm It's great to see you back at work again, doing some good old boostin'. :lol:
:) Yeah not "back" by far yet. Just doing a bit of pottering about now and then currently. It might even be next year before I get back to things "full time". Just got too much stuff to get done currently.
mrbombermillzy wrote: Tue Mar 22, 2022 2:37 pm I wonder how much faster this CPU package type of the 68k can reach (with all the capacitance/interfacing signal problems sorted, so it's just the limitations of the CPU itself manifesting) using progressively more extreme active cooling solutions and a nice dose of overvoltage?

Can't wait to see how far you get with this. Keep up the great work! :dualthumbup:
If I run it at 5.2V then 64MHz runs at full speed. But it is not a great solution really. I don't think the CPU is overheating because even running at higher voltages, it can get rather hot, but still does not crash. I suspect the actual CPU die is running like 30c hotter than the package. It is certainly not "burn your finger hot" . But obviously not a good way of running things. Which is why I need to solve the parasitic problem as it will inherently run a lot cooler anyway.

I had not considered when I designed the system that while the RAM is 10ns, the bus takes at least 20ns to actually settle.. Then plus the 10ns delay of the RAM.. PLD delays etc.. It all adds up.. The system will run perfectly happy at 50MHz. but I'm hitting a brick wall of limitations that 64MHz could take some time to resolve. Wherever the limit lies, I think 80Mhz is going to be the literal ceiling on this. Of course I want to push it as much as I can just out of pure interest more than anything :)
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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mrbombermillzy
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Post by mrbombermillzy »

exxos wrote: Tue Mar 22, 2022 2:58 pm :) Yeah not "back" by far yet. Just doing a bit of pottering about now and then currently. It might even be next year before I get back to things "full time". Just got too much stuff to get done currently.
Well, you just ease in at your own pace.

I think @rubber_jonnie seems to be doing a good job running the forum; well, filling the forum with posts anyway! :lol: :poke:

Will be keeping a close eye on the work done here though. ;)
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GadgetUK164
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Post by GadgetUK164 »

This is an incredible project! How compatible is this "SEC" vs a stock 68K?
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Post by exxos »

GadgetUK164 wrote: Tue Mar 22, 2022 8:13 pm This is an incredible project! How compatible is this "SEC" vs a stock 68K?
All I can find is this on wiki.. Whatever it means.
The 68000 does not meet the Popek and Goldberg virtualization requirements for full processor virtualization because it has a single unprivileged instruction, "MOVE from SR", which allows user-mode software read-only access to a small amount of privileged state. The 68EC000 and 68SEC000, which are later derivatives of the 68000, do meet the requirements as the "MOVE from SR" instruction is privileged. The same change was introduced on the 68010 and later CPUs.
IIRC the SEC was supposed to be 100% code compatible, but wiki says otherwise :shrug:

As to how important that is, whos knows ? But the 030 is a lot different and people seem to manage fine with that one.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Post by rubber_jonnie »

mrbombermillzy wrote: Tue Mar 22, 2022 6:04 pm
I think @rubber_jonnie seems to be doing a good job running the forum; well, filling the forum with posts anyway! :lol: :poke:
Thanks for the (Back handed) compliment. I think....
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800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
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JezC
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Post by JezC »

rubber_jonnie wrote: Tue Mar 22, 2022 10:39 pm
mrbombermillzy wrote: Tue Mar 22, 2022 6:04 pm
I think @rubber_jonnie seems to be doing a good job running the forum; well, filling the forum with posts anyway! :lol: :poke:
Thanks for the (Back handed) compliment. I think....
At least he's not trying to provoke you into more purchases...with this post anyway! ;)
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Post by rubber_jonnie »

JezC wrote: Tue Mar 22, 2022 10:41 pm
rubber_jonnie wrote: Tue Mar 22, 2022 10:39 pm

Thanks for the (Back handed) compliment. I think....
At least he's not trying to provoke you into more purchases...with this post anyway! ;)
Honestly, I don't need provoking!!
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Post by JezC »

rubber_jonnie wrote: Tue Mar 22, 2022 10:41 pm Honestly, I don't need provoking!!
:lol:
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PhilC
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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Post by PhilC »

No fair I wanna play with a ram board too :lol:

My sec ran everything I tried it on, although it was only running at 64mhz not 80 like @exxos's one.

I have a spare water cooler setup handy. 100mhz anyone? :lol:
If it ain't broke, test it to Destruction.
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