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 Post subject: New 1-Chip RGB bypass
PostPosted: Sat May 14, 2022 11:23 am 



Joined: 07 Jul 2020
Posts: 53
This is super clean, not too bright, no wash out.
@vajskid (twitter) for some pictures that really don't do it justice
Uses an an analogue LT6550

Image

One tiny discrepancy to my breadboard prototype is the pull-downs are @ input pins / negative side of AC coupling caps.

No sync BS, won't kill composite. No worrying about "is there a resistor on my cable to bring it down from TTL" etc.

I have to try it in a phat model now, when i get time.
I really should bust open the SCART cable just to 100% confirm what's in it.
I did a customers install of one of Borti's bypasses and the cable he sent didn't work at all, where as mine did. (Also an NTSC SFC JR).


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 Post subject: Re: New 1-Chip RGB bypass
PostPosted: Sat May 14, 2022 12:23 pm 


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Joined: 14 Nov 2020
Posts: 68
Wish I could find a 1 chip.


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 Post subject: Re: New 1-Chip RGB bypass
PostPosted: Sat May 14, 2022 1:26 pm 



Joined: 07 Jul 2020
Posts: 53
Lopenator wrote:
Wish I could find a 1 chip.


Easy to find, but not cheap. I asked for serial numbers and got a PAL one dirt cheap, sold it for a lot less than they go for now. I don't like 50hz.. yeah there's a mod but nah.


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 Post subject: Re: New 1-Chip RGB bypass
PostPosted: Sat May 14, 2022 9:44 pm 


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Joined: 06 Oct 2015
Posts: 2881
Location: Montréal, Canada
Trivially easy: all SNES Jr are 1chip.


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 Post subject: Re: New 1-Chip RGB bypass
PostPosted: Sat May 14, 2022 9:51 pm 


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Joined: 09 Jun 2017
Posts: 311
Guspaz wrote:
Trivially easy: all SNES Jr are 1chip.


That's what I did, just got a Jr. Easy-peasy. But, I'd sure love to have a 1-chip phat model just for nostalgia-sake of liking the old design.


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 Post subject: Re: New 1-Chip RGB bypass
PostPosted: Sun May 15, 2022 2:05 am 



Joined: 07 Jul 2020
Posts: 53
Keep your eye on the JP listings on eBay, they're all ridiculously overpriced atm, cheapest I can find is 228AUD free shipping for a phat... but I scored one for 172AUD inc. shipping going off current conversion rates... that was from 'mitsuya-shop1'
I got the mint condition JR for 200AUD WITH all cables, shipped, and he threw in a CIB copy of Donkey Kong (JP version). This was from 'japan-kyoto28'- also don't be afraid to inbox them as these guys deal consoles and actually go on the hunt for your requests (he can get me any colour fully boxed JP N64, for example).
Just keep checking the listings, make sure you watch ones you're interested in as sellers always send out offers.


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 Post subject: Re: New 1-Chip RGB bypass
PostPosted: Sun May 15, 2022 4:00 am 



Joined: 07 Jul 2020
Posts: 53
https://i.imgur.com/UmYx53x.jpeg

OSSC/ scan lines / 4:3 / IPS monitor
hoping small issues found are due to a mess of jumper wires on a breadboard with components held in finger tight

Edit: Also switched 5k1 to 5k6 ...


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