shmups.system11.org

Shmups Forum
 
* FAQ    * Search
 * Register  * Login 
It is currently Thu Aug 24, 2017 4:42 am View unanswered posts
View active topics



Post new topic Reply to topic  [ 4 posts ] 
Author Message
 Post subject: Genesis 2 Sync Issue
PostPosted: Sun Aug 13, 2017 3:33 am 



Joined: 05 Mar 2017
Posts: 99
I'm experiencing a weird sync issue with a Genesis 2 in a specific configuration. I have a workaround - I'm more interested in understanding why the problem happens. I've tried a range of configurations:

GOOD: Genesis 2 -> RCA csync RGB cable -> PVM
BAD: Genesis 2 -> RCA csync RGB cable -> Sync Strike -> Extron Rxi -> PVM
GOOD: Genesis 2 -> RCA csync RGB cable -> Sync Strike -> Genius 2 -> Extron Rxi -> PVM

GOOD: Genesis 2 -> RCA sync-on-composite RGB cable -> PVM
GOOD: Genesis 2 -> RCA sync-on-composite RGB cable -> Sync Strike -> Extron Rxi -> PVM
GOOD: Genesis 2 -> RCA sync-on-composite RGB cable -> Sync Strike -> Genius 2 -> Extron Rxi -> PVM

I've confirmed with RCA that the csync cable contains a 220uf capacitor and 470 ohm resistor. I obviously can just use my sync-on-composite cable. I am however curious whether something is out of spec and that is causing the problem. The earlier problem I had with my SNES csync cable only manifested itself in a specific configuration and was resolved with an added resistor on the sync line.

Anyone have any thoughts?

Thanks,
Steve


Top
 Offline Profile  
 
 Post subject: Re: Genesis 2 Sync Issue
PostPosted: Sun Aug 13, 2017 4:40 am 



Joined: 26 Nov 2011
Posts: 149
Hmm, you're sending csync into a sync cleaner. I have no idea what may go wrong when attempting to remove composite video signals that don't exist.


Top
 Offline Profile  
 
 Post subject: Re: Genesis 2 Sync Issue
PostPosted: Sun Aug 13, 2017 4:54 am 



Joined: 05 Mar 2017
Posts: 99
As far as I can tell, it's necessary when using the Extron Rxi. Most of my systems use csync and the Genesis 2 is the only one that runs into trouble. I've tried leaving out the Sync Strike, and this causes most systems to not work.

It's worth noting that my RCA cable has buffered sync - could this be to blame? It looks like RCA isn't selling the buffered sync as a default anymore.

In case you're curious why I'm not just using sync-on-composite, I see jailbars on my consumer CRT. The csync version looks great there.


Top
 Offline Profile  
 
 Post subject: Re: Genesis 2 Sync Issue
PostPosted: Sat Aug 19, 2017 7:00 am 



Joined: 05 Mar 2017
Posts: 99
I got a cable that does not contain a buffered sync circuit and that resolved my problem.


Top
 Offline Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC


Who is online

Users browsing this forum: Bing [Bot] and 17 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Space Pilot 3K template by Jakob Persson
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group