Scyzor

O yeah, standalone mode. Didn't thought about it. Thanks again!

OK, so I had it set to 1088k Rambo. Looks like the naming nomenclature has changed since. At first, I thought I screwed something when flashing from 3.x to 4.x I was looking at juggling carts, not CF cards till I had all moved from SIDE2 onto SIDE3. I assume by switching the plugin from S2 to S3 I will lose access to the hard disks on SIDE2.

Reliable @flashjazzcat, thanks for the explanation! Now all is clear.

Sounds like it. So my question is should I keep OS as XL 1.3 for 130XE or look to load a dedicated OS ROM for XE? Not sure what exactly is that XL 1.3 based on https://atariwiki.org/wiki/Wiki.jsp?page=OS Versions

Yeah, I have done that with Atari OS-B PAL and then I'm getting the same error as I have posted in the OP. Also, I'm using SIDE2. Got SIDE3 but is not ready to use as I have other questions related to it (posted in another thread).

U1MB version: Working BIOS config: and in case of UFlash what was flashed so far:

OK, so based on https://atariwiki.org/wiki/Wiki.jsp?page=OS Versions I can load 400/800 OS Rev. B NTSC and which revision of XL/XE should I look for?

OK, trying to find that option to enable due to the same error message. Even can't even find it in the manual Also another question. Currently, I have U1MB + SIDE2 (both up to date) but recently got SIDE3. From the description, I need to flash only U1MBS3FW.ROM but then I will lose backward compatibility with SIDE2? I mean I need to backup stuff non-FAT partitions from SIDE2 before flashing U1MB to add SIDE3 support?

Hmm... I can't find that option that they are talking about including manual

For some reason, Ultimate 1MB (FW ver 4.20) stopped recognizing extended memory in the 1088 Rambo config. When I run SDX it shows no extended memory. When I try to run UFlash it shows the message: Please enable extended RAM or disable SDX RAMdisk. I have that behavior when OS ROM is set to Atari OS-B PAL. It works fine when set to XL 1.3. Is that because I have an NTSC machine? Is there a way to add or replace OS-B PAL to OS-B NTSC? Or add XL/XE as another choice how it was in old FW version? Thanks

And I think this is the problem. I have put 60mm PC fan above it and it was working stable for more than 5 minutes. Only one thing which I have noticed are strange shapes on the screen where is green color on the picture below (left side and bottom - top right is fine). It looks like a scan of a memory bank or so. Doesn't look like typical "jail bars". So back to the TIA - should I replace it or put some radiators on it or do some small 5V/9V fan mod?

Based on schematics below it looks like that C208 and C209 are behind the CR200 and CR201 but C209 is before R211 so voltage fluctuation source can be C203, and looking at CR200 I should to have stable 5V on anode side of it no matter how I will adjust R211. Also I have have no clue if Q201 will have anything to do with that or it is just there for as signal from a crystal.

When I max out R211 (counterclockwise it to #1) I have between 7-5V (when will change to B/W) the same on CR201 cathode. Even I have pulled out A201 and clean up the socket. Did not help much but now when I will leave console up and running it will fade out to B/W and then is getting darker. When I was adjusting R211 from #1 towards #4 I was getting those readings on C209: 5.75V (with drop when goes B/W), 5.10, 7.07 (R211 in the middle), 7.22 and 7.40v (when turned on #4) C208: 4.56v (with drop when goes B/W), 3.87, 1.92 (R211 in the middle), 0.56 and 0.20v (when turned on #4) No clue from where those drops are coming from PS. I have left multimeter attached to CR201 and voltage started to fluctuate between 7.2 and 4.64 after like 2-3 minutes. To have it back to 7V I need to turn off console and unplug power supply.

So based on above diagram I'm getting below 5V on pin #10 of A201 and 6.75V on cathode of CR201 so it comes that it may be defective: - C208 - C209 - R211 I think I can rule out defective R211 as there is valid voltage on CR210. At that case I think one of capacitors may be defective: C208 and/or C209.

Yeah - that is with B/W, no changes there. C201 is stable 5.05-5.06V CR201 is 6.75V and 5.68V Also found that diagram for repairing 2600 so will try to follow it.