[Solved] My new ST2320L crashes connected Amigas?!

[Daedalus]

@ciVic

Are you using some sort of adaptor in between the RGB port and the monitor? Some adaptors use transistors on the sync lines to buffer them and prevent the Amiga from thinking it had a genlock attached - maybe you need something like this?

If you're handy with a soldering iron, there are schematics for this sort of adaptor on Aminet...

[Daedalus]

Fair enough, maybe you could check the adaptor you have to see if it's connected straight through or if it contains transistors. My bet is that it's just connected straight through (or possibly with resistors on some lines) rather than being buffered.

Just had a look at AmigaKit's website - they don't specify whether their adaptor is buffered, so maybe send them a mail to find out. A quick search of Aminet gave me these: ami2vga.lha and VGA_Hack.lha both use a TTL chip to do the buffering job, which probably works very well and shouldn't be too difficult to build...

[Daedalus]

Yeah, many years ago I had that issue with a particular monitor. Can't remember what make it was now, but it had me baffled for quite a while until I borrowed another monitor which worked perfectly. Buffering the sync lines solved it for me - perhaps it's only the odd screen that has issues, I haven't come across one which caused that issue since then...

[Daedalus]

@Damiga
I think Pin 9 is just used as a key pin - the entire middle row of pins are normally just grounds for the various signals and are often simply wired together. Seems strange that that might "fix" things, unless it's some very bizarre ground loop or something like that, as Piru suggested earlier...