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 Post subject: Re: Sega Mega Drive/Genesis Jail bars
PostPosted: Thu Nov 08, 2018 1:45 am 


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Joined: 18 Feb 2015
Posts: 2119
Location: DFW area, Texas
Visker wrote:
I am planning to do the lift pin 50 mod. Though i have some questions first.
I have the RGB scart cable from retrogaming.co.uk which uses the standard composite sync.
If I lift pin 50 will only the video signal be removed from that line and the sync signal still be added later on?
A french site had some reservations when using a 32X doing that mod, I wondered what your experiences was with that.
Thanks!


The sync signal is carried in the luma part of the composite video line, so removing the chroma won't hurt it at all. It effectively becomes "sync on luma" instead of "sync on composhit video".

Also it won't affect the 32X either, so long as you intend to keep using RGB as the output signal. Here's an OSSC optimal timing image of my own 32X on a pin-50 lifted M1 VA3:

Image

-FBX
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Web Site: http://www.firebrandx.com

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 Post subject: Re: Sega Mega Drive/Genesis Jail bars
PostPosted: Sun Nov 11, 2018 10:40 pm 



Joined: 17 Jan 2017
Posts: 49
FBX wrote:
Visker wrote:
I am planning to do the lift pin 50 mod. Though i have some questions first.
I have the RGB scart cable from retrogaming.co.uk which uses the standard composite sync.
If I lift pin 50 will only the video signal be removed from that line and the sync signal still be added later on?
A french site had some reservations when using a 32X doing that mod, I wondered what your experiences was with that.
Thanks!


The sync signal is carried in the luma part of the composite video line, so removing the chroma won't hurt it at all. It effectively becomes "sync on luma" instead of "sync on composhit video".

Also it won't affect the 32X either, so long as you intend to keep using RGB as the output signal. Here's an OSSC optimal timing image of my own 32X on a pin-50 lifted M1 VA3:

Image

-FBX


Looks absolutely spectacular!!! :D


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