Getting proper csync from
consoles - WORK IN PROGRESS
This page is for advanced users, so I didn't include diagrams or how-to instructions, just
descriptions and links. Please see the main sync page if you need more info
When finished, this page will show how to get proper
75 ohm sync from each console. I still have a lot of testing to do and will update this page as soon
as I have more information. Before
starting, please be aware that in the context of retro gaming, there are two types of csync signals: TTL and
75 Ohm. Most displays and processors will require 75 Ohm csync, but some can accept TTL. As a general
rule, unless your setup specifically requires otherwise, your target goal is that the cables you use with your
consoles will all be outputting a 75 Ohm signal and the target device will also be receiving a 75 Ohm signal.
This is important to mention, as some switches and processors actually change the voltage of the sync signal as
it's passed through.
Also, when used in an NTSC setup, composite video
and luma are already 75 Ohm signals and don't require any components on the line when used as
How to check
what components are already inside your cable:
Required for each console: Below, I'll describe what's required to get proper 75 Ohm csync from each
console and other possible alternatives (if necessary). Under each description, I'll add a "quick
reference" to what components are needed on the csync line (most likely in the SCART head) of each
Super Nintendo (PAL) - PAL SNES' have 12v on pin 3 of the mulit-out, NOT
csync!!!! If you connect a csync cable to a PAL SNES, yu can damage your equipment!!! I recommend
just using a cable that gets sync from luma (pin 7)
or composite video (pin 9) on the
multi-out connector (luma recommended).
csync line: DON'T USE IT!!!
Sega Genesis 1 / Mega Drive 1 / Master System - These consoles output TTL sync from pin 1 on the A/V connector. All RGB SCART cables that use csync from
an SMS should have a 470 ohm resistor and a 10uF - 220uF / 10v (min) - 16v capacitor (with the
positive leg facing the console) on the sync line in the SCART head. 10uF is all that's needed, but
it's very common for people to use 220uF, since many people already have them. Either way, the voltage
shouldn't be below 10v and I prefer 16v to be safe.
csync line: 470 ohm, 1/4 watt resistor and a 220uF/16v capacitor
Sega 32x - The Sega 32x jumper cable does not need any components in it. Also, a
5v connection should NEVER be connected between the Genesis and 32x!!! Please read this for more
NES / Famicom - The NESRGB mod offers both TTL and 75
ohm csync output, toggled via jumper J8. If you plan on using a SNES multi-out and standard SNES
cable, use TTL to match the SNES' output. If you're using a cable with no
components in the line, make sure to use75ohm output. csync line: Select sync via jumper.
N64 - Only a few revisions of the N64 have csync already run to the multi-out
and compatibility isn't consistent. If csync isn't required, I recommend using a cablethat
gets sync from luma (pin 7)
or composite video (pin 9) on the
multi-out connector (luma recommended). If csync is required, I recommend either adding a sync
stripper to the SCART head of a sync-on-luma cable, or using an RGB mod that includes a proper sync signal
as part of the mod. At the moment, Voultar's board is the only one I'm aware of that does this. Performing a mod like
this one will allow you to use an NTSC SNES RGB cable that uses csync.
csync line: Either not used, or the same as SNES.
Another solution would be to make your own output port and get csync directly from the Playstation's video
chip. The earlier models use a CXA1645, where you can tap all the RGB signals, plus csync. The
later models use a much smaller IC called H7240, or a re-branded version labeled "Sony A2160". If you
have the Sony version, you can tap csync from the via marked in the lower-right picture. If you have the
H7240, you'll have to solder directly to the chip, which is extremely hard and should only be done by people
with SMD soldering experience. Unless you plan on adding your own output to the system, it's easiest to
just use a custom cable, getting sync from luma. (Thanks to Oerg866 for the tip and pictures!):
Playstation 2 - None of the Playstation systems output csync from their A/V ports.
Using luma for sync is the next-best option and if csync is required, you can install a sync stripper in the
SCART head. As an FYI, PS2's also output all signals via component video and there's even an option
to output 480p via RGsB.
Also, I've seen a few guides online that describe how to tap VGA directly from the PS2's motherboard, but
have not gotten them to work. Feel free to contact me if you have more information about this.
EVERYTHING BELOW NEEDS TO BE VERIFIED!!! COMING
Nintendo GameCube - PAL GameCube consoles do not have a csync pin or a luma
pin. The only way to get an RGBs signal is to use composite video as sync. If csync is required,
you can get an RGB SCART cable with a sync stripper built-in, however keep in mind that a sync stripper
in the SCART head will only improve compatibility and not composite video interference.
Philips CDi - Most front-loading CDi systems use the Sony CXA1145 video chip and can be
RGB-modded. I believe the sync output is TTL and requires a 470 ohm, 1/4 watt resistor on the sync line, but I need to verify.
Atari Jaguar - All video outputs are available on the back connector, including csync
which is pin 5B. For more information on the a/v pinout, see the Jaguar section.
3DO - All 3DO systems require a pretty complicated RGB mod, which
includes a sync stripper. I suggest following the mods exactly as listed, but use a custom connector, to make it easier to get cables for all switches and displays.
Nintendo Wii - Only PAL Wii's output RGB, however all output component video. In the
case of the Wii, I actually suggest using component, as I've found very little difference and it supports all
resolutions. As an FYI, the Behar Bros makes a great component to VGA / RGB SCART converter called the Garo.
I hope this page had everything you needed, but feel free to contact me if I missed anything. Also, more sync information can be found in the main sync page