REV 3 - REV 5 - The beginning (ST536)

All about the ST536 030 ST booster.
terriblefire
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Re: REV 3 - The beginning

Post by terriblefire »

exxos wrote: Wed Apr 07, 2021 10:33 pm
terriblefire wrote: Wed Apr 07, 2021 10:25 pm Nutcase.. :D
You still love me though :lol: :fire: :fire: :fire:
Well your the only one who'll let me lose on their forum.... mwhaahahahhaha,,,
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Icky
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Re: REV 3 - The beginning

Post by Icky »

Great work @exxos

Nice! :thumbup:
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Re: REV 3 - The beginning

Post by Badwolf »

terriblefire wrote: Wed Apr 07, 2021 10:25 pm
exxos wrote: Wed Apr 07, 2021 10:23 pm 117.6MHz clock (58.8Mhz CPU)
Nutcase.. :D
Certifiable. :crazy:

BW
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Re: REV 3 - The beginning

Post by exxos »

It looks like something really starts to struggle over 61Mhz. I have disabled the SDRAM as well.. I think it could just be the bus isolators.. I mean they take 20ns to disable... along with the ROM it is mostly moaning the ROM is having problems being accessed, and I have slowed its access right down as well. I put the plastic package one in which otherwise is working fine at 50 MHz, that one does not even boot up, so I assume it is the CPU actually tripping up and nothing else.

I am going to put a faster buffer on the next revision of the board. It is hard to find one that JLC stock , which are actually faster as well.
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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terriblefire
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Re: REV 3 - The beginning

Post by terriblefire »

Yeah i never got 030s past 56-57Mhz without parts of them stopping to work. Think there is a fundamental limit somewhere there.

S
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exxos
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Re: REV 3 - The beginning

Post by exxos »

terriblefire wrote: Thu Apr 08, 2021 1:01 pm Yeah i never got 030s past 56-57Mhz without parts of them stopping to work. Think there is a fundamental limit somewhere there.
In terms of long-term stability 50Mhz seems to be about as high as you could really go anyway. I have ordered a couple of supposed different mask EC's to see if they are any different.
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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exxos
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Re: REV 3 - The beginning

Post by exxos »

Been busy rerouting the buffer isolator chips... It went from two chips to one chip, the fastest one I can really find is a ABT version. About 7ns isolation time, the old ones were about 20ns.

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Re: REV 3 - The beginning

Post by exxos »

Feking Eagle libs :pullhair: :headbang: :cussing: :cussing:

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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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exxos
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Re: REV 3 - The beginning

Post by exxos »

Some time later... hope it fits this time...

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EDIT:

Yep!

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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 ?
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Re: REV 3 - The beginning

Post by exxos »

The board was running most of yesterday at 50MHz on my H4...

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The results I was keeping a eye on.. The GEM dialog box ( actually that should probably be spelt dialogue ? :lol: ) It was interesting because in the morning the test was 300%.. And during the day when it all heated up in my room picked actually dropped to 299%.. And around midnight when it had dropped in temperature it went back up to 300% again! just goes to show how very small tolerances in hardware can affect things.

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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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