CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

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

Post by exxos » Sat Jan 23, 2021 3:52 pm

I've had a thought that I'll need some pull ups on the 4 control lines to 3.3v. As the SEC booster has to run on the 5v bus, I can't feed 5v into the SRAM lines.. So pull ups to 3.3v and open collector drive on the booster should fix the problem.

I hope to order these boards on Monday along with the SRAM. Once its all working , I will try and build a few for stock, though I'm not planning on making many of either as time and cost will be pretty high..plus the board will only work on the H5.. I do hope to move to SDRAM type board in the future. Though with things going at a snail pace all the time, I don't think that board will get done this year.
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?

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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Post by exxos » Mon Jan 25, 2021 3:11 pm

I've patched up the current SRAM board.. The chips are to slow for 50MHz+ speeds, so had to add some waitstates..

Considering the TF536 pushes around 800% without caches and is 32bit, It makes sense that a 68000 Can operate around 400% as its 16bit. Though I think once I get the new SRAM board built, I can easily run 64MHz. So 400%-500% speeds should really be reachable.

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I have had it also at 359% but this is only a quick patch up to see things are working as expected.
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?

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Re: CURRENT PROTOTYPE STATUS (SEC 64MHz 68000)

Post by exxos » Tue Feb 02, 2021 11:52 am

64MHz! Sweeeeeeeeet! 8-)

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GB6 is still running in ST-RAM, So be interesting to see what speed gains are when its running in alt-ram. Probably shoot up a bit more :)
https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?

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