OSSC with an Amiga: SCART vs VGA

[Reezo]

Hello everyone,

first and foremost thanks for having me here: I’ve been a lurker for some time and I am onto my first message, now. Thanks for your indirect help, so far. This place is a gold mine 🙂

I have an Amiga 1200 and an OSSC. Happily connected via RGB->SCART cable from the Amiga to the OSSC and then from the OSSC to my HDTV via an HDMI cable.

I am wondering:

1. Is an RGB-to-VGA cable going to be better than an RGB-to-SCART, quality-wise? Or is video quality only in that area only going to be dictated by other characteristics, like cable quality etc?
2. I built myself an RGB to VGA cable but I get a “no signal” from my OSSC when connecting it. It’s a simple cable with connections, no buffer or weird stuff. Do I need some kind of buffered converter?

In general I think most people are using a SCART cable, like I am.. but I was wondering if a VGA connection is going to yield better quality, for any number of reasons.

Thanks!

[BuckoA51]

1) No, SCART is better for the Amiga with the OSSC.

The VGA input on the OSSC is really designed for clean, 31khz signals, the type you’d get from a PC. For the Amiga you’re dealing with 240p and 480i in games, so connecting via SCART will be better as this input has a low pass filter.

2) How did you connect sync? Did you choose RGBS input mode for AV3?

[Reezo]

Totally agreed! Thanks for the input, that’s also what I found out. Thanks for confirming it.

I soldered my own RGB to SCART following Ian’s amazing guide: http://ianstedman.co.uk/amiga-scart-guide/

and used a VGA cable I had laying around, which has all separate shields + grounds plus an overall shield for the whole cable (nothing fancy, just typical “OK” VGA cables, but what I had before used a normal 8-wire cable with literally ZERO ground).

Not only does it work but it looks amazing and the noise is basically inexistent even at a gain of 12-13 inside Video in Proc.. I am super happy!

[MattiasN]

Hi for me on my Amiga 1200 23pin to VGA and then to OSSC VGA input did give me much better and cleaner picture

but maybe i have to test the 23pin to Scart again and see if i get any better signal but i do not think it can get any better then the VGA signal i have now it’s very sharp

OSSC Firmware 0.88a

here some pictures

Workbench VGA only

OSSC -> DVDO iScan Duo -> Blackmagic intensity shuttle usb

[Author]

Posts

[Reezo]

Hello everyone,

first and foremost thanks for having me here: I’ve been a lurker for some time and I am onto my first message, now. Thanks for your indirect help, so far. This place is a gold mine 🙂

I have an Amiga 1200 and an OSSC. Happily connected via RGB->SCART cable from the Amiga to the OSSC and then from the OSSC to my HDTV via an HDMI cable.

I am wondering:

1. Is an RGB-to-VGA cable going to be better than an RGB-to-SCART, quality-wise? Or is video quality only in that area only going to be dictated by other characteristics, like cable quality etc?
2. I built myself an RGB to VGA cable but I get a “no signal” from my OSSC when connecting it. It’s a simple cable with connections, no buffer or weird stuff. Do I need some kind of buffered converter?

In general I think most people are using a SCART cable, like I am.. but I was wondering if a VGA connection is going to yield better quality, for any number of reasons.

Thanks!

[BuckoA51]

1) No, SCART is better for the Amiga with the OSSC.

The VGA input on the OSSC is really designed for clean, 31khz signals, the type you’d get from a PC. For the Amiga you’re dealing with 240p and 480i in games, so connecting via SCART will be better as this input has a low pass filter.

2) How did you connect sync? Did you choose RGBS input mode for AV3?

[Reezo]

Totally agreed! Thanks for the input, that’s also what I found out. Thanks for confirming it.

I soldered my own RGB to SCART following Ian’s amazing guide: http://ianstedman.co.uk/amiga-scart-guide/

and used a VGA cable I had laying around, which has all separate shields + grounds plus an overall shield for the whole cable (nothing fancy, just typical “OK” VGA cables, but what I had before used a normal 8-wire cable with literally ZERO ground).

Not only does it work but it looks amazing and the noise is basically inexistent even at a gain of 12-13 inside Video in Proc.. I am super happy!

[MattiasN]

Hi for me on my Amiga 1200 23pin to VGA and then to OSSC VGA input did give me much better and cleaner picture

but maybe i have to test the 23pin to Scart again and see if i get any better signal but i do not think it can get any better then the VGA signal i have now it’s very sharp

OSSC Firmware 0.88a

here some pictures

Workbench VGA only

OSSC -> DVDO iScan Duo -> Blackmagic intensity shuttle usb

[Author]

Posts