[rescue] ECL to VGA and pinout (anoybody experience with TenoxVGA + Sun2?)

[Walter Belgers]

Hi,

I have a few Sun2's and only one working ECL monitor (that needs recapping). Another ECL monitor does not work and I am not knowledgeable enough to fix it.

So I looked into Antoni Sawicki's TenoxVGA project <https://github.com/tenox7/tenoxvga>. I had 10 PCB's made (as 1 is not really cost effective - what is left I will sell via Tindie). But, it has a DB15 input connector that's used on the Atari TT instead of a DB9 connector as used on the Sun2.

I dig a lot of digging and there's not much information. It took some time to get the schematic from the TenoxVGA and it doesn's say what pin is what, but to an extend that can be deduced from looking at the schematic. My guess:

Sun DB9
1 +ECL
6 -ECL
5 GND
3 HSYNC
4 VSYNC
8 SYNC return

DB15 TT (input on TenoxVGA)
4 +ECL
9 -ELC (goes to GND via resistor)
5 GND
10 GND
15 SYNC return (goes to Vcc and GND both with resistors)
HSYNC 13
VSYNC 14

DB15 VGA (output on TenoxVGA)
1, 2, 3 RGB (hooked up to +ECL)
5, 10 GND
6, 7, 8 GND (RGB return)
13 HSYNC
14 VSYNC

I made a DB9<->DB15 cable, crossed my fingers and hooked it all up. The is an image! So a) the PCBs work b) the sync signals are coming through.
But, the image show a sort of vague raster in the background. There's a bright vertical line at the beginning of the scan lines (the image is too far to the right). I am using an Extron RGB-HDMI 300A to get a 'clean' VGA signal I should add. (That detects the correct resolution coming in.)

Does anybody have experience using the TenoxVGA on a Sun2 and can confirm the pinout?

Walter.

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