1040STE don't like floppy drive

[doc]

As said in the first post my drive works perfectly in another ST.

[doc]

Hi There !
So I'm back with some news :
I changed the DMA controler for another -38 picked up from a 1040STF that was fine.
And... it works !! Well not totaly. In fact it now displays the desktop with A and B drives. I can read a floppy and display the files and directories on it.
But when I run a PRG the STE bombs and reboots, sometimes it bombs when I just open a folder.

So I change the 1772 floppy controler too but this made no change.
I even desolder the 1772 pull ups fix (mandatory 4) but there, again ... no change.

Here is a little video fo what happens.
https://www.youtube.com/watch?v=g9YuXGS ... e=youtu.be

I must admitt that i'm a bit stucked now as I nearly changed all what could be... except the ROMS. Do you thing the Roms could be the faulty chips ? Or perhaps just a problem on the motherboard track...
Any more suggestions ?

[Steve]

@doc I read through this and noticed you haven't tried the cpu/address bus resistor changes or the 1k resistor pullups on the LS chip.

https://www.exxosforum.co.uk/forum/viewt ... =17&t=1395
https://www.exxosforum.co.uk/forum/viewt ... 235#p27504

[exxos]

Can you run YAART either from floppy or cart ? I would also suggest resoldering all the CPU pins, maybe even the RAM, clean the contacts as well.. I say as its more like its getting corrupt RAM somehow.. Loading a corrupt program doesn't normally reset the whole machine, its like the address being accessed is wrong and trashing lower ram or something..

[doc]

@Steve I already archieve this mod but I had no result.
@exxos I resoldered the CPU, RAM et much more but nothing more.
At the end i think it is time for me to put it on the shelves for parts... I tried, you tried and thank you very much for that. I learnt a lot thanks to you all guys. But I'm sure I'll have some more question for so more ATARI ST in the future ;)

[exxos]

you could send me the board to look at, but can't promise when id get chance to look at it. If there is some odd DMA related issue then I really want to know what it is...