exxos's Atari, Amiga & retro forum

Hi, after about 25 years I am trying to resurrect my old Ataris, The one I am trying first is my original 520STFM, TOS 1.0, 512 MB
the following mods were professionally fitted many years ago

1. 4MB XTRA-RAM DeLuxe with 4 x 9 chip 1 MB simms from Frontier Software.
2. Compo Software dual TOS so I could have tos 1 for games and 2.06 for Applications, switchable through a side mounted toggle switch on the case.
3. HD floppy disc and some work was done to the floppy controller chip by fitting a COMPU-WARE HD MOGUL module on it. It all worked fine 25 or so years ago but now when I booted it up in TOS1.0 all I get is the desktop(Green) with no icons and TOS 2.06 just gives me a white screen.

I have none of the original manuals or set up sheets, the TOS switcher was fitted by COMPO, the HD was fitted by a shop in Newcastle upon Tyne, long since defunct and I think the RAM was fitted by Atari Workshop
motherboard is C070523-001 REV D, with the original 512 ram along the front and the tos roms on the right of mobo
Suggestions please as to what to do?

Got to systematically work things out.... the connections for these old upgrades corrode and oxidise over time... Firstly I would remove everything, clean all the connections, chips, sockets etc with de-oxit. Re-assemble. The fact that one version of TOS works but not the other, would suggest the TOS ROMS need cleaning for sure.

I thought you might say that, way beyond my capabilities.

Well you could send it to me if you want (I re-capped your TT PSU) Just send me a PM if you like.