exxos build

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Icky
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Re: exxos build

Post by Icky »

We love towers on this forum.
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Re: exxos build

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Finally tested the PLCC MFP!

I don't know if anyone else has tried that or not, I cannot find the "tested list" @Icky ?

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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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Icky
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Re: exxos build

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exxos wrote: Sun May 03, 2020 9:31 pm Finally tested the PLCC MFP!

I don't know if anyone else has tried that or not, I cannot find the "tested list" @Icky ?
Not tested yet @exxos and list is here https://www.exxosforum.co.uk/forum/viewt ... =78&t=2457 :)
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Re: exxos build

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@exxos got the socket but never got round to getting the chip.
If it ain't broke, test it to Destruction.
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Re: exxos build

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Icky wrote: Sun May 03, 2020 9:44 pm Not tested yet @exxos and list is here https://www.exxosforum.co.uk/forum/viewt ... =78&t=2457 :)
Right.. lets see if I can updated it without ballsing it up..
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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 ~
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Re: exxos build

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Been puzzling why the TF536 kept resetting on my H4 so did some quick poking out just..

For some odd reason its really sensitive to the ST's DTACK. It only works when I touch DTACK or have the scope probe on it :shrug: signal looks otherwise fine on the scope. So not sure what the issue is there. Could be some slight timing issue somewhere @terriblefire ?


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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: exxos build

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exxos wrote: Wed Jul 08, 2020 11:22 am Been puzzling why the TF536 kept resetting on my H4 so did some quick poking out just..

For some odd reason its really sensitive to the ST's DTACK. It only works when I touch DTACK or have the scope probe on it :shrug: signal looks otherwise fine on the scope. So not sure what the issue is there. Could be some slight timing issue somewhere @terriblefire ?
Possibly. The way it works is that it lets ST DTACK become DSACK1 after a resync period has passed.. By that time the 030 is in 7Mhz mode..

Worked really well on my H4. :/
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Re: exxos build

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terriblefire wrote: Wed Jul 08, 2020 11:33 am Possibly. The way it works is that it lets ST DTACK become DSACK1 after a resync period has passed.. By that time the 030 is in 7Mhz mode..
I don't know if the xilinx stuff can have schmitt inputs or not, if it has (and not already) turn it on for the DTACK signal ? I mean scope probe is like what, 3pf on x10 or something. So might just be picking up noise.. Or possible doesn't like the slow rising edges of DTACK ?

EDIT:
I tried adding 10K pullup on it (already has 2.2K on the H4) but didn't help.
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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 ~
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Re: exxos build

Post by terriblefire »

exxos wrote: Wed Jul 08, 2020 11:52 am
terriblefire wrote: Wed Jul 08, 2020 11:33 am Possibly. The way it works is that it lets ST DTACK become DSACK1 after a resync period has passed.. By that time the 030 is in 7Mhz mode..
I don't know if the xilinx stuff can have schmitt inputs or not, if it has (and not already) turn it on for the DTACK signal ? I mean scope probe is like what, 3pf on x10 or something. So might just be picking up noise.. Or possible doesn't like the slow rising edges of DTACK ?
There isnt a Schmitt trigger but i can get rid of the noise by sampling it with the 100Mhz clock... will just delay dtack by 10ns...

I can try that if you have the means to reprogram it?
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Re: exxos build

Post by exxos »

terriblefire wrote: Wed Jul 08, 2020 11:54 am There isnt a Schmitt trigger but i can get rid of the noise by sampling it with the 100Mhz clock... will just delay dtack by 10ns...
Yeah that could work.
terriblefire wrote: Wed Jul 08, 2020 11:54 am I can try that if you have the means to reprogram it?
Yeah, about to leave here for 2 days, so won't be home again until Friday now.
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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