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MacViking card found in a SE
Posted by: olivercampion on 2026-03-12 10:29:59
I also bought an SE with same card. I wish I had a Moniterm Monitor.
Nice! Did you see I found the driver? I posted it on this thread. Can you see if it works for your card?
Posted by: Chardonneret on 2026-03-12 11:49:49
I’ll have a look when I’m less busy. Thank you very much for the hint.
🙂
Posted by: Chardonneret on 2026-03-13 12:37:13
OK, I instalked the viking card and the driver. It appeared with a question mark during boot (probably because no monitor was connected to the card) and then I could see it in tge control panels. Having something else to do, forgot to double click on it. Go figure…
Posted by: Chardonneret on 2026-03-13 14:12:49
Oopsie… Same player shoots again 🤪
Posted by: franklyn on 2026-03-18 05:49:36
... there are Motorola ECL chips on the card and a 110Mhz quartz so I think it is a ECL Graphiccard and you need a ECL monitor for it or try a ECL to VGA Converter made for the Atari TT computer ...

shop.inventronik.de

Atari-TT ECL zu VGA Adapter - Inventronik

Video Adapter zum Anschluss moderner TFT-Bildschirme an den Atari TT
shop.inventronik.de shop.inventronik.de

github.com

GitHub - tenox7/tenoxvga: Atari TT High Resolution Mode on VGA Monitor

Atari TT High Resolution Mode on VGA Monitor. Contribute to tenox7/tenoxvga development by creating an account on GitHub.
github.com github.com

The Atari TT has a 128Mhz Pixelclock but I use it also for a Viking Atari Mega ST Card with 110Mhz
Posted by: Chardonneret on 2026-03-18 08:10:29
Viking card connector is 9 pin male.
Posted by: franklyn on 2026-03-18 12:23:31
Yes but is it not a problem, you can build a 9pin to 15pin HD Adapter. The Viking Atari Mega ST Video ECL card need -9 Volt Power from the ECL Monitor to feed. I believe it's the same with the Macintosh ECL graphics card.

Video ECL Port are: ECL + / ECL + GND / ECL - / ECL - GND / H-Sync / V-sync / Sync GND / - 9 Voltage

Look at the Motorola datasheet from the ECL Chips. The need +/- 5V to work. Measure whether the negative voltage comes from the computer power supply or via the video socket and the voltage regulator with the black heatsink onto the graphics card.
Posted by: Chardonneret on 2026-03-19 00:41:15
Thank you very much
Posted by: trag on 2026-03-20 08:58:11
Welcome to the dawn of desktop publishing where pixels were king, even in single bit/black-n-white. Think of these as the high end GPUs of the day. 😉

@trag can you hop in and detail testing for TTL output and then converting it to analog?


For some reason I didn't get the notification until today. But it looks like it's been covered, and while I appreciate the faith in my abilities, I don't actually know how to convert TTL to VGA. 🙂
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