Will this work?

[alexh]

Possibly. My Iiama has both VGA and BNC connectors but only supports 31KHz video via either. For it to work the monitor must support a 15KHz horizontal scan rate.

The fact that it was connected to a video toaster would indicate it could support 15KHz.

It would probably be cheaper to buy a Commodore SYNC dongle (or equivalent) and get a 15-pin D to BNC cable

What model monitor is it?

[alexh]

It will work fine. It doesn't pre-date VGA, it's a TV-Monitor.

I've added USA ebay link to a BNC cable for ~$10 above.

If you don't have a sync dongle (23-pin to 15-pin adapter) might be worth getting a 23-pin to 9-pin cable?

These were standard Amiga monitor cables (~$24) to 1084D or Philips CM8833MKII monitors

[alexh]

80%-90% (cant be sure without monitor model number)

The worse case scenario is you (get a mate to) resolder the 9-pin end...

[alexh]

If you are brave enough to want to make your own Sync dongle then it will be easy to fix the cable if the wiring is wrong.

This is the wiring for the 1084 monitor (and thus the cable). Analog of course.

Get the model of the monitor and we'll see if we can get the manual and the pinout of the connector.

[alexh]

The Amiga 9-pin D cables all conform to the EGA (for analog) and CGA (for digital) wiring standards so perhaps look if it says CGA/EGA??

P.S. you wont want to use the digital mode... it's only 4-colour

[alexh]

If it says digital then you are correct, the BNC hack is the way to go.

I am sure you can get a sync dongle cheap from somewhere.. $10 or so.

[alexh]

$27+shipping from AmigaKit which is a bit of a rip off.

$24 plus shipping from Vesalia is better but not by much.

Perhaps softhut might have some and they are in the USA. But their website has not been updated for many years... email them direct first.

Not familiar with this company but Connections has them for $19.28 and they are USA based (but it is not as nice a dongle)

[alexh]

$30 bucks including the BNC cable aint too bad.

[alexh]

Some (all?) Amiga's can support SOG cant they?

[alexh]

Zac67 wrote:
Erm... EGA was/is digital (6 bit = 64 colors)

Hmm.. Yeah, so what was I thinking of that was analog with the same pinout as 1084S/CM8833-II??

Perhaps there was a 9-pin VGA or something.

[alexh]

Zac67 wrote:
Possibly, but it's the first time I've heard that.

There is a software bit in a register

http://www.winnicki.net/amiga/memmap/BPLCON2.html

SOGEN = Sync-on-green

And I think they all have override jumpers/links on the motherboard to enable SOG in all software.

A4000 = J500

[alexh]

That circuit is already inside the Amiga...

The best solution (assuming the Y-BNC doesnt work) would be to re-wire your 23-pin to 15-pin adapter.  

It would take about 10 seconds with a soldering iron. Even a novice could do it. Desolder HSYNC wire and resolder to the CSYNC pin.

http://pinouts.ru/Video/AmigaVideo_pinout.shtml

They are right next to each other on the 23-pin connector.

Then you'll have RGB+CS on four BNC's