OSSC loosing AV1_RGBS input signal on firmware version 1.09.

[evileagleowl]

Hi!

I’ve just received my OSSC 1.8 today and connected it to my MSX Philips NMS-8245 via SCART cable AV1_RGBS. Everything worked perfectly out of the box. Connected it at first to my Panasonic plasma via hdmi and later to my old LCD Philips via HDMI to VGA converter. Played some games for few hour – zero problems. Initial firmware was 1.07 so I’ve decided to upgrade it to the newest one. Downloaded 1.09 and flashed via sd card as instructed. After that operation ossc started to loose and restore input signal resulting in screen blanking every few moments. That happened when AV1_RGBS was selected (not on test pattern – here everything was ok). I’ve reset settings to default, double checked connections – no change, loosing video every few moments. After that I’ve decided to downgrade to 1.08 and viola – no signal losing, no screen blanking.

[marqs]

Sync processing logic had a minor update on v1.09 which should make it more tolerant against variations during vblank region, but it sounds like it doesn’t behave well with this specific MSX. If I get a chance to ever test NMS-8245, I can debug this further.

[evileagleowl]

It You make some updates in the code for that matter I can test it and give you feedback.

[konradp]

I have 2 OSSCs, one was a generic v1.7hw upgraded to 1.8hw, runs fine with 1.09fw, when I upgraded an older OSSC version purchased apporox 3 years ago, assuming v1.6hw (maybe earlier HW revision) the unit did the same thing as mentioned above, it was blanking out every 5-10 seconds and resetting, you can see the front led and lcd screen flicker. On this older unit going back to firmware 1.08 solved the issue, no more resets. From my experience there is some sort of issue with 1.09fw and older revision hardware upgraded to 1.8hw with v1.09 firmware. Hope this helps, I am very glad I found this post as I would have not tried downgrading to 1.08 which solved my problem.

• This reply was modified 1 year, 6 months ago by konradp.

[marqs]

Resetting as in going back to test pattern as after power-on?

[evileagleowl]

I have OSSC 1.8 hardware purchased few months ago and it has problems with 1.09fw.

[konradp]

Best I can describe it is every 5 to 10 seconds the LCD glitches out, sync list and the power led flashes then a second later sync comes back on and this cycles continually. This only happens on 1.09 on the older hardware I mentioned and does not happen on 1.08. Tested only on a MVS supergun with DFO. But clearly it’s a 1.09 issue + ossc hardware combo, when doing this one 1.09 + 1.7hw upgraded to 1.8hw problem was not there.

[marqs]

A sync filtering fix added in 1.09 is known to have caused issues with MSX, but are we talking about some other sources here as well?

[dodogildo]

Similar case: I’m having 2-3 sec screen blackouts with my Philips VG-8235 MSX2 connected via SCART on firmware 1.09. I had to rollback to 1.08 in order to fix the glitch.

Hoping this will be fixed on future releases.

[marqs]

This should be now fixed in the v1.10 release.

[evileagleowl]

I can confirm that 1.10 works good on my MSX nms8245. Thank You!

[Author]

Posts