IBM 8514 video signal

[inakito]

Hi everybody,
I was trying to capture the IBM 8514 video signal and have found some inconsistencies compared to 8514 documentation. 1024x768 interlaced mode.
I am not using the real 8514 source but an Extron video generator, that, supposedly, generates an 8514 compatible video signal.
First, I see vertical and horizontal sync both positive, while documentation states V is positive and H is negative for 1024x768.
Besides this, I see just one 87Hz vertical sync while the documentation states it should be two 43.5Hz sync pulses per frame, interlaced.
Does anyone having an 8514 card confirm these parameters?

 

[WBST]

Hi everybody,
I was trying to capture the IBM 8514 video signal and have found some inconsistencies compared to 8514 documentation. 1024x768 interlaced mode.
I am not using the real 8514 source but an Extron video generator, that, supposedly, generates an 8514 compatible video signal.
First, I see vertical and horizontal sync both positive, while documentation states V is positive and H is negative for 1024x768.
Besides this, I see just one 87Hz vertical sync while the documentation states it should be two 43.5Hz sync pulses per frame, interlaced.
Does anyone having an 8514 card confirm these parameters?

This has as much information as we have determined over decades:
https://www.ardent-tool.com/video/IBM_8514.html