Ok I tried something else, I realised the 1084s has v and h sync. Not sure why I didn’t try it sooner I have this picture coming up once creating a cable for v and h sync. I connected the c-sync circuit I created to correct c-sync pin later as well to see if things would change and nothing changed....

Sorry I actually thought I had mentioned this, I had a 1040 STFM I sold around two and a half months ago, I kept the 520 due to the 4mb upgrade. I guess if I do buy another I’ll probably look for a STE. Anyway the 1040 worked fine on my C64 monitor I never did try it on my OSSC or lcd as I never had...

Thanks for your time mate maybe it’s time I start looking for a replacement. I just didnt want to give up hope as it has such a awesome 4mb ram upgrade.

Doing a bit more research could this be a problem with the shifter? I’m running out of options.

Sorry, I’ve been off the grid for a while, I had to put this project aside to get some sanity and now here I am back again. I have worked out it is not the monitor but the Atari itself causing this weird issue. I have acquired a ST2VGA and on an older LCD monitor and my OSSC it still does the same t...

I actually hadn’t considered it. Due to having the 1040 working I thought it would have been possible. 1040 was running purely csync to monitor no V or H sync connected so it must accept Csync. Anyway if moving to the scart option and that was also my next step once I had it opersrional on the monit...

Yeah I have checked the c-sync pinouts from R130 to Monitor Pin and it’s right. I also had a 1040 here that worked perfectly with it plugged in. Double check cable pinouts from the Commodore Monitor and it’s the same pin. I have a cheap oscilloscope here but havnt has much practice with it. Can I c...

Ok I tried something else, I realised the 1084s has v and h sync. Not sure why I didn’t try it sooner I have this picture coming up once creating a cable for v and h sync. I connected the c-sync circuit I created to correct c-sync pin later as well to see if things would change and nothing changed. ...

Yeah I have checked the c-sync pinouts from R130 to Monitor Pin and it’s right. I also had a 1040 here that worked perfectly with it plugged in. Double check cable pinouts from the Commodore Monitor and it’s the same pin. I have a cheap oscilloscope here but havnt has much practice with it. Can I ch...

Looks like ive made a slight mistake, the area i have circled on the board is V-Sync line connecting trace would be to 5v. Would it be a resistor not a cap? cant see anything on the schematics or am i missing something. The cap is actually meant to be a 100 Picofarad on the H-sync line according to ...