The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

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The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by exxos »

v15t1.jpg
This board is a evolution of the V1 booster which includes faster access to ROM. Changes were made to move away from the TTL logic as it wasn't fast enough to also switch the ROM into 16mhz mode. So I am now using a faster SMT GAL chip.

So while the V1 boosted CPU to 16mhz, the V1.5 also switches into 16mhz mode while accessing ROM. Over a stock machine this gives up to 71% speed boost and 50-60% average boost over a stock machine.

I have also added in a much simpler 8/16mhz switch as the V1 caused a mass of confusion :) This time, only 1 pad on the booster (SW) and a 0V line are needed to force 8mhz modes. So when SW is connected to 0v, it forces 8mhz mode, and when the SW pin is left floating, it enables 16mhz speeds :)

http://www.exxoshost.co.uk/atari/last/v ... /index.htm

I need to do more testing on it yet to make sure its stable before production. I have run into some issues with the ST RESET signal. It does not seem very stable and only seems to work right when the scope probe is connected to the signal :roll: So probably I will just bypass the rest signal to the GAL as it is not really needed. In anycase, so far today it has been stable so hopefully there will be no other problems.

These will be on sale in due time. I don't have a time scale for this or a cost yet. As this booster needs 2 kits to work then its going to be more expensive than the V1 by a fair bit. I also ran into problems programming the GAL as my programmer did not support the Philips SMT GAL , which was the only SMT 7ns GAL I could find. So they had to go to a programming company to be done, so that adds a little to the overall cost also. I need to carefully work all this out. But at least there is some progress towards faster speeds :)
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by NikolaL »

I hope it will turn out well. :wink:
Place for 5 volts, atleast 1000uF 6.3V or 16V capacitator into board at your psu power plug :wink:
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by exxos »

NikolaL wrote:I hope it will turn out well. :wink:
It's actually been tested a lot of the past few weeks while I was doing the 4MB kits. So it seems to work perfectly well with speeding up TOS. It really does work nice with blitter also. I will try and take benchmarks for 8mhz machine with blitter and 16mhz machine with blitter. I think the results would be interesting. I will do that soon :)
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by qq1975b »

:thumbs:
So this V1.5 booster has two parts, right? CPU little board like V1 but also a ROM board? ....Mega ST compatible? :lol:
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by exxos »

qq1975b wrote::thumbs:
So this V1.5 booster has two parts, right? CPU little board like V1 but also a ROM board? ....Mega ST compatible? :lol:
2 parts yes. MEGA, no idea, reminds me I still need to test the PLCC MEGA ROM adapters yet, so when I get around to it, I will try V1.5 booster on it :wink:
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by exxos »

mega15.jpg
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by 1024MAK »

OMG, time to get my wallet out again :lol:

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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by qq1975b »

Ohhh! Looks great Chris! :thumbs:
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by exxos »

The MEGA booster will be a DIP GAL as there is less restriction on height. Plus as the MEGA is fickle, if any code changes need to be done for any reason, then its easier to program a DIP GAL than SMT one :)
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by GadgetUK164 »

Thanks the great work on these mods! Here's the vid related to install of your switchable fast TOS, 4Mb RAM and the 1.5 16Mhz CPU board.

http://youtu.be/giWkXrwaFCQ
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by exxos »

GadgetUK164 wrote:Thanks the great work on these mods! Here's the vid related to install of your switchable fast TOS, 4Mb RAM and the 1.5 16Mhz CPU board.

http://youtu.be/giWkXrwaFCQ
Good video as always :cheers:
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by ChrisTG »

So normal 27Cxxx eproms on a TOS expansion card are too slow?
Is there any chance that it will work with TOS 2.06, too?

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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by exxos »

ChrisTG wrote:So normal 27Cxxx eproms on a TOS expansion card are too slow?
Is there any chance that it will work with TOS 2.06, too?

regards,
Chris
Eproms have to be 100ns or faster. TOS206 works, if you mean on STFM, then you just wire the CE line to the TOS206 CE line instead of the ones on the motherboard. Though if your TOS206 decoder is slow then might be to slow for 16mhz. V2 booster works with TOS104 & TOS206 at 16mhz.
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by ChrisTG »

Ah, okay. Then I think I'll give it a try. :cheers:
When will it be buyable in your shop?
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by exxos »

ChrisTG wrote:Ah, okay. Then I think I'll give it a try. :cheers:
When will it be buyable in your shop?
Not sure currently, I did post current progress here a few days ago though.

http://www.atari-forum.com/viewtopic.ph ... 66#p275453
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by exxos »

http://www.exxoshost.co.uk/atari/last/store.htm

V1.5 boosters are now on available to order in my store. I am going to just not use the reset line as its looking more and more like the Atari circuit needs some tweaking so its getting to complicated to add this CPU booster otherwise.

Please note, the V1.5's need fast rom's also. The Atari ROM's are not fast enough. They need to be 100ns or faster. I sell fast rom kits in my store to fit STFM / MEGA machines. These need to be purchased seperatly from the V1.5 booster. So you need 2 kits if you want to make use of this V1.5 booster with fast rom.
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by ChrisTG »

Cool, I just ordered the v1.5 + Rom kit :P
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by ChrisTG »

Btw: How do I get TOS2.06 on the PLCC-ROM then?! :shrug:
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by exxos »

ChrisTG wrote:Btw: How do I get TOS2.06 on the PLCC-ROM then?! :shrug:
You can't run anything higher than TOS104 on a STFM by default. To use TOS206 you need a couple of extra GAL's & logic to do it. The V2 booster has this, but that is a long way off production.
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by ChrisTG »

exxos wrote:
ChrisTG wrote:Btw: How do I get TOS2.06 on the PLCC-ROM then?! :shrug:
You can't run anything higher than TOS104 on a STFM by default. To use TOS206 you need a couple of extra GAL's & logic to do it. The V2 booster has this, but that is a long way off production.
Damned, then it seems I got you wrong. I thought it's possible with v1.5, too.
Could you please cancel my order? I'll have to wait for v2 then :(
Sorry! :shrug:
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by exxos »

OK no problem :)
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by ChrisTG »

Thanks, mate! :cheers:
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by exxos »

If you (or anyone else) is waiting on the V2, then I can build these in 16mhz. Though as its a larger more complex board (6 layers I.E expensive) it will be a significant price jump from the V1.5 booster series. The V2 is switchable from TOS104 to TOS206. I will start a new page on my website about it and try and work out the price for it as soon as I can. So people can check the page for progress on it. Most progress is on my general booster page anyway. http://www.exxoshost.co.uk/atari/last/16mhz/index.htm Though I have not had change to update it for some time.

The hold up on those is 32mhz, its looking less likely as time goes on that its going to be doable. But I have not yet totally given up on it. But as my time is limited this time of year, then its probable I won't be able to work on it until the end of the year or maybe next year.
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by exxos »

http://www.exxoshost.co.uk/atari/last/1 ... #AUG132015

A small update, not much, but it is really to let people know we have not given up on these projects. Of course the 020 has its own threads maintained by Rodolphe, so there won't be news of that here now.
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Re: The LaST Upgrade - Part 18 - V1.5 16MHz CPU & ROM Booster

Post by spiny »

keep at it :)
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