Hi, just doing some work on Paradroid STe with the infamous DMA issues writing to Ultrasatan. He has the 32mhz accelerator installed. I am looking to geogeo's recent thread for guidance as he managed to solve his problems: https://www.exxosforum.co.uk/forum/viewt ... 1&start=20
So far:
* P100 resistor array is 2.2k, so will swap this to 1.2k
* Remove the other resistor arrays as recommended
* Socket DMA to try different chips
Oh bloody hell how am I going to get these resistor arrays out with the 32mhz booster over the top and soldered into place...
With a lot of careful patience, desoldering gun & flux & wick I carefully managed to remove them with some tweasers.
Just a check to see if everything is still working:
Paradroid STE DMA issue blog
Re: Paradroid STE DMA issue blog
He didn't though ? He still has issues ?Steve wrote: ↑Tue Feb 02, 2021 7:43 pm Hi, just doing some work on Paradroid STe with the infamous DMA issues writing to Ultrasatan. He has the 32mhz accelerator installed. I am looking to geogeo's recent thread for guidance as he managed to solve his problems: https://www.exxosforum.co.uk/forum/viewt ... 1&start=20
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.
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.
Re: Paradroid STE DMA issue blog
Oh ok well... I'll just do what I can and see if my results are different to geogeo's. @exxos do you recommend running with the address bus resistors removed like this or shall I try 2.2k also.
Re: Paradroid STE DMA issue blog
If the booster is in, then remove the MB roms...
*IF* They are all 10K they could be left in... I can't say for 4.7K ones.. Best to remove them...
As a side note, are people using a good PSU for ultrasatan ? as "chargers" can cause all sorts of chaos..
*IF* They are all 10K they could be left in... I can't say for 4.7K ones.. Best to remove them...
As a side note, are people using a good PSU for ultrasatan ? as "chargers" can cause all sorts of chaos..
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.
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.
Re: Paradroid STE DMA issue blog
I've also found the ACSI cable to be extremely important to the reliability of 3rd party ACSI devices. 20 cm ribbon cable seem to be more or less a maximal length. Also, the crappy fake Apple/Samsung USB chargers often bundled with various 3rd party devices are causing problems. Use a good quality PSU, or at leas a genuine Apple/Sony/Samsung USB charger to power your UltraSatan.
Re: Paradroid STE DMA issue blog
This Ultra is internal and powered from the motherboard. So no dodgy external power.
Re: Paradroid STE DMA issue blog
UPDATE ON TESTING:
TRIED WITH TWO DMAS:
DMA - CO25913-38 PH23-030 / 8M4 44
RESULT: 8Mhz write corruption / 32Mhz write corruption
DMA - CO25913-38 PH23-030 / SJ4 95
RESULT: 8Mhz write corruption / 32Mhz OK
TRIED WITH TWO DMAS:
DMA - CO25913-38 PH23-030 / 8M4 44
RESULT: 8Mhz write corruption / 32Mhz write corruption
DMA - CO25913-38 PH23-030 / SJ4 95
RESULT: 8Mhz write corruption / 32Mhz OK
Re: Paradroid STE DMA issue blog
Cannot tell, but does not look like the DMA pullups are fitted?
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.
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.
Re: Paradroid STE DMA issue blog
I'll try that next @exxos cheers
Just double check, you mean the 10k pullups on the WD1772 chip? https://www.exxosforum.co.uk/forum/viewt ... =17&t=1417
Just double check, you mean the 10k pullups on the WD1772 chip? https://www.exxosforum.co.uk/forum/viewt ... =17&t=1417
Re: Paradroid STE DMA issue blog
Yep.Steve wrote: ↑Thu Feb 04, 2021 11:04 am Just double check, you mean the 10k pullups on the WD1772 chip? https://www.exxosforum.co.uk/forum/viewt ... =17&t=1417
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.
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.