exxos's Atari, Amiga & retro forum

Hello,

Got an Atari STe 1040 that is unable to correctly partition a SD card in a UltraSatan. I partition it but when it reboots it doesnt see it. It also has trashed content of folders for example, i started devpac and made some preferences changes and saved it, now the devpac folder is empty.

So i guess this is a DMA issue. I have exxos PSU and a 68HC000 processor that troed was so kind to donate but the problem still exists.

If i have understood it correctly my next step is to add a pullup om the DMA buss? I have checked the mandatory fixes page but are still a bit unsure. So i wanted to confirmt that it is this that i should do



/zChris

Yes this is the next logical step to take.

Indeed. However, the UltraSATAN (at least the Lotharek one) pulls the ACSI bus *hard* to 3.3V and some DMA chips just can't handle this.

Try this program https://www.exxosforum.co.uk/forum/viewt ... ?f=25&t=43

stephen_usher wrote: 19 May 2022 13:06 Indeed. However, the UltraSATAN (at least the Lotharek one) pulls the ACSI bus *hard* to 3.3V and some DMA chips just can't handle this.

Do you mean strong pull-ups? It is surprising as there doesn't seem to be any pull-ups at all in Jookie's original US schematics, just voltage dividers. But, I don't know, it is possible that Lotharek made some changes. Or do you mean something else?

Out of curiosity, what driver are you using?

ijor wrote: 19 May 2022 16:50

stephen_usher wrote: 19 May 2022 13:06 Indeed. However, the UltraSATAN (at least the Lotharek one) pulls the ACSI bus *hard* to 3.3V and some DMA chips just can't handle this.

Do you mean strong pull-ups? It is surprising as there doesn't seem to be any pull-ups at all in Jookie's original US schematics, just voltage dividers. But, I don't know, it is possible that Lotharek made some changes. Or do you mean something else?

I don't know why but the data lines are pulled strongly to 3.3V if the UltraSATAN I have isn't driving them.

Putting a 2.2K resistor to +5V doesn't shift the voltage at all, not even a centivolt, so whatever is pulling the lines to that value is very strong. Goodness knows how much current the DMA has to sink to pull them down for data transfer.

@stephen_usher Maybe they are just zener clamped to 3.3v ? Even so that wouldn't be good for the STE which has driver chips :roll:

exxos wrote: 19 May 2022 14:03 Try this program https://www.exxosforum.co.uk/forum/viewt ... ?f=25&t=43

Tried this program and only got * which was good i think. Run it for like 20 minutes.

UltraSatan and card is OK since i can partition it with my H4 board and it reads it correctly on Atari STe. Its when its writing that its a big chance of corruption AND it doesnt work to partition the SD card with ATari STe. Using HDDRIVER 11

rubber_jonnie wrote: 19 May 2022 16:53 Out of curiosity, what driver are you using?

Using HDDRIVER 11