VideoGamePerfection.com | davemarcotte | Activity https://videogameperfection.com/members/davemarcotte/activity/ Activity feed for davemarcotte. Tue, 23 Jun 2026 01:57:24 +0100 https://buddypress.org/?v= en-US 30 hourly 2 83ded801abd00803da438d34c971e510 davemarcotte replied to the topic What cap and resistor ratings do I use to mod my JP21/scart cable to get 75 ohm? in the forum OSSC - Discussion and support https://videogameperfection.com/forums/topic/what-cap-and-resistor-ratings-do-i-use-to-mod-my-jp21-scart-cable-to-get-75-ohm/#post-54162 Mon, 18 Jul 2022 09:11:02 +0100 Okay. Thanks so much. I’m going to research what the best value o-scope is to buy right now these days and learn how to use it. I’ve always wanted to anyway and this gives me a reason.

No change after. Still noisy/blurry picture in the reddish tint zone. No idea why. More to learn and test I guess. Thanks for taking the time for me.

]]> 0e26f84579c684f3bd3bc60a0f4746b5 davemarcotte replied to the topic What cap and resistor ratings do I use to mod my JP21/scart cable to get 75 ohm? in the forum OSSC - Discussion and support https://videogameperfection.com/forums/topic/what-cap-and-resistor-ratings-do-i-use-to-mod-my-jp21-scart-cable-to-get-75-ohm/#post-54140 Sat, 16 Jul 2022 13:36:04 +0100 I don’t, no. How do I test for that?

]]> ece7452a92a2d3b83f38bfc2997a28d1 davemarcotte replied to the topic What cap and resistor ratings do I use to mod my JP21/scart cable to get 75 ohm? in the forum OSSC - Discussion and support https://videogameperfection.com/forums/topic/what-cap-and-resistor-ratings-do-i-use-to-mod-my-jp21-scart-cable-to-get-75-ohm/#post-54136 Sat, 16 Jul 2022 11:14:45 +0100 Well, perhaps I’m having trouble because I’m testing with a Pandora Box DX Special with a JAMMA connector.
When I set it to 15hz, I get nothing from the OSSC. When I set it to 720p 16:9 I get video and audio out of the OSSC. It’s just reddish and blurry.

Setting the DX to 640×480 4:3 I get nothing out again although I was earlier.

Not sure…Read more

]]> 44deb13d2be456f2b5b04c4e0f0fa08a davemarcotte replied to the topic What cap and resistor ratings do I use to mod my JP21/scart cable to get 75 ohm? in the forum OSSC - Discussion and support https://videogameperfection.com/forums/topic/what-cap-and-resistor-ratings-do-i-use-to-mod-my-jp21-scart-cable-to-get-75-ohm/#post-54133 Sat, 16 Jul 2022 10:59:15 +0100 So why does the OSSC wiki say this, “A 470 ohm series resistor on the console side of the cable is generally a good solution when using cables which are wired for the TTL-level sync output of a console.” ?

If we’re trying to get 75ohm output? Is it because even though the cable reads 470 ohm between the source pin and the input side of the…Read more

]]> f9043d6ab1583d2249d61ea44f882a6c davemarcotte replied to the topic What cap and resistor ratings do I use to mod my JP21/scart cable to get 75 ohm? in the forum OSSC - Discussion and support https://videogameperfection.com/forums/topic/what-cap-and-resistor-ratings-do-i-use-to-mod-my-jp21-scart-cable-to-get-75-ohm/#post-54132 Sat, 16 Jul 2022 09:51:17 +0100 Thanks Bucko. I tried again today and it is giving me video and audio output after all. So that’s good news.

It does look overdriven. Noisy and slightly blurry and in the reddish tint.

I think I’ll solder in a 470ohm resistor and a 220 10v cap and see what it looks like.

Does it take an oscilloscope to see what the supergun is outputting…Read more

]]> 6b47efdcbd81477093bb7e00f116388c davemarcotte started the topic What cap and resistor ratings do I use to mod my JP21/scart cable to get 75 ohm? in the forum OSSC - Discussion and support https://videogameperfection.com/forums/topic/what-cap-and-resistor-ratings-do-i-use-to-mod-my-jp21-scart-cable-to-get-75-ohm/ Sat, 16 Jul 2022 09:03:36 +0100 Hi guys,
I’m new here and to a lot of this stuff.

I just received my OSSC 1.7 this week along with a JP21 to SCART adapter cable from Matt.

I have a ‘The Special Version of Combo AV’ supergun here I’m trying to get to work with the OSSC.

Matt mentioned I need to be careful and be sure it’s outputting 75 ohm. I need help getting there.

I…Read more

]]> 3a23ce14075b2cb620e8d75fbd1bbd20 The user: davemarcotte bought Open Source Scan Converter (OSSC) V1.7 - Multi-region PSU, Remote + overlay & JP21 adapter https://videogameperfection.com/activity/p/2313/ Sun, 03 Jul 2022 14:28:23 +0100 0