[Solved] My new ST2320L crashes connected Amigas?!

[bbond007]

Unfortunately I only have one adapter. The adapter itself, without a monitor, does not crash the Amiga, but I think that does not mean anything. I could put a transistor on my adapter on my own, but maybe there is one from amigakit or vesalia I could buy? Would be easier. Or maybe I should buy a genlock, then my Amiga has something to sync :laugh1:

PS: For my original Zorro Busboard I have a flicker fixer. Plugged into this card I have no problems.

I have the same dell 2320  and the silver adapter from amigakit and my 1200 boots just fine. Hope thst helps

[Damiga]

Here's a trick that sometimes work on PCs.
Although it's not often there are issues with connecting a monitor to a PC, but it has happened to me a couple of times (I work with IT). Mostly on laptops when hooking up to a projector.

So the trick is:
Remove pin nr 9 on the cable, if it's present. I just bend it back and forth a couple of times and then it brakes off.
I've noticed that quite often pin nr 9 is not even present on vga cables supplied with monitors.
So you could also check if you have another VGA cable without pin nr 9 present.

NOTE: I wouldn't recommend removing the pin if the cable is permanently attacked to the monitor, in case you want to return the monitor.

[amiman99]

FYI, I have a SR2320 with sync strainer and it works fine with multiple Amigas.

[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...

[Zac67]

Pin 9 is either key or +5V from graphics. If it's even connected through the adapter an EMI is limiting the current to ~100 mA - don't think too high a load is any problem (unless the PSU is critical already).

[Pyromania]

FYI, I have a SR2320 with sync strainer and it works fine with multiple Amigas.

Yup, Sync Strainer should resolve most if not all syncing issues with these Dell monitors. Dell almost bought the Amiga technology in the late 1990's. Maybe Michael Dell needs these monitors to sync to 15Khz to use with his Amiga's?

[rockape]

Hi ciVic,

See   http://www.wonkity.com/~wblock/a4000hard/connvga.html

Quote

"Connecting VGA Monitors

VGA monitors can be connected to the A4000; however, since the special circuitry in the Amiga video output can mistakenly identify a monitor as a genlock and thus cause problems, a special cable or adapter is the best way to hook them up.

All this cable really does is buffer the horizontal and vertical sync signals by double-inverting them through a TTL gate. Commodore's DB23-to-HDD15 adapter (supplied with most A4000s) used a 74HCT08 for this, but you can use a 74LS04 or other low-power TTL-level inverters (or other gates wired as inverters or buffers, of course)."


I hope this helps.


Regards, Michael

aka rockape

[Kremlar]

Here's a trick that sometimes work on PCs.
Although it's not often there are issues with connecting a monitor to a PC, but it has happened to me a couple of times (I work with IT). Mostly on laptops when hooking up to a projector.

So the trick is:
Remove pin nr 9 on the cable, if it's present. I just bend it back and forth a couple of times and then it brakes off.
I've noticed that quite often pin nr 9 is not even present on vga cables supplied with monitors.
So you could also check if you have another VGA cable without pin nr 9 present.

NOTE: I wouldn't recommend removing the pin if the cable is permanently attacked to the monitor, in case you want to return the monitor.

NOTE I WAS INCORRECT BELOW - IT'S PIN 12 THAT I PULLED TO ELIMINATE EDID

Pin 9 is EDID and basically allows the monitor to provide information to the PC about what modes it supports.  Sometimes you can have odd driver or compatibility problems and pulling pin 9 can help.

For example one of my older HTPCs produced a black screen when booting into Windows 7 with the proper video driver installed and connected to an older Panasonic plasma I have.  Didn't matter what resolution and/or frequency I had it set to.  Pulling pin 9 fixed the issue, but since there is now no EDID I need to be careful setting resolutions because the PC no longer know which resolutions the TV supports.

[ciVic]

Hi ciVic,

See   http://www.wonkity.com/~wblock/a4000hard/connvga.html

I hope this helps.


Regards, Michael

aka rockape

Hi rockape,

oh yes, nice link. Sounds easy to make an adapter with two vga connectors and a TTL IC. Thank you!

[Zac67]

@Kremlar

EDID is the data structure, the signal/pin is called Display Data Channel (DDC) and sits on pin 12. The monitor DDC circuitry may however require +5V present on pin 9 to work while not being powered up; some monitors may even require pin 9 power while they're running.

[Kremlar]

Doh!  You're right.  I confirmed it was pin 12 I pulled for my plasma.  Not sure why I was thinking it was pin 9.

[magnetic]

tbh dont recommend users "pulling pins" not necessary. Better just to get a real cbm vga adaptor.

[ciVic]

Thanks to all! I built an adapter as described in the link by rockape and it works! Ok, I took my old adapter and soldered the IC into it. Looks a bit clutter, but fits into the original small case.

[bbond007]

Thanks to all! I built an adapter as described in the link by rockape and it works! Ok, I took my old adapter and soldered the IC into it. Looks a bit clutter, but fits into the original small case.

how macgyverish of you

good job

[MelbourneBen]

Im in the process of making my own cable using this guide:

http://www.wonkity.com/~wblock/a4000hard/connvga.html

However I'm not sure which wires connect to where on the IC (I'm using a 74LS04) I've tried working it out from Civics picture that is posted above but its rather hard to know for sure which wire goes where.

Any help would be much appreciated.

I've downloaded some guides from aminet but they seem to conflicting instructions.

Thanks

[magnetic]

Yup, Sync Strainer should resolve most if not all syncing issues with these Dell monitors. Dell almost bought the Amiga technology in the late 1990's. Maybe Michael Dell needs these monitors to sync to 15Khz to use with his Amiga's?

Hmm I just saw a Sync Strainer listed on US ebay!