Help needed: SCART to 1084

Can anyone point me to a schematic for how to make a SCART to RGB cable for the Commodore 1084?

Despite how many people seem to be using this display for games via RGB, its surprisingly hard to find this info.

Just to clarify: I have multiple consoles with SCART cables and a US spec 1084. My attempts to make a cable have failed utterly with all consoles. There is no out of sync image, there is no image whatsoever with any console. The monitor works perfectly with composite video, but I don't have an Amiga to verify that the RGB in actually works. I'm pretty sure it does, but I've never seen it.

I'm in the US, so I have very very few ways of using or testing anything related to 15kHz RGB. Actually, since my XRGB2+ is broken and there isn't anything within 1000 miles with an actual SCART socket on it this 1084 is the only display I have that will both take RGB and sync to 15kHz. Actually, that's not true. I also have a GBS 8220, but that f-ing thing is so picky that not getting a signal on it doesn't mean much (ie: Neo and Saturn are perfect, everything else just sucks). This shouldn't be very hard, but evidently I'm very bad at this.

To add to the confusion, the whole daisy chain-ability of SCART confuses me. The fact that the "video" lines have ins and outs but the R, G, and B don't. The separate grounds...I just need to know which pins go to what other pins and I'd be very grateful for some help. Thanks in advance!

 

There are several versions of the 1084. Please clarify.

If you connect R,G,B (and ground), you sould see a flickering, colorfull image in RGB-Mode. So, It just pulls down to these steps: Connecting R,G, B and Ground, and then supplying the right sync.

Did you have a look at gamesx.com? They got lots of information regarding this issue, monitor and consoles.

If a console is suppling video sync to a monitor (your case), you will find sync on pin 19 of the scart plug.

ninn

 

The monitor itself has no model number on it. It just says, "Amiga Monitor". The box it came in says 1084 on it. Its from 1984, so I think its probably the first one. It has no D-RGB input and it has just a one speaker.

As for hooking it up, yeah, I tried that. I didn't know which ground to use from the SCART (there are 6 or 7 grounds on a SCART socket and only one for the 1080) so I tried composite out ground, no go. Then I just connected all the video related grounds on the SCART (R, G, B, and comp out) together.

Most of the discussions I've heard about these monitors relate to fixing a crapy sync. At this point I would love to have a crappy sync. I have nothing.

 

Tie all grounds to shield, that should be fine.

Presumably you're wiring up composite for sync? Some monitors won't like that - you'd need to make an LM1881-based circuit to strip the sync out of the composite signal.

 

I'm pretty sure the 1080 takes a composite sync just fine, but I don't actually know this for sure.

My next step is to wire something that has a separate sync to the 1080 and see how that goes.

 

There was a similar thread over on the NTSC-UK forum >here<. It's for a diffrerent model (1084s) but I think the information provided there will come in handy.