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Thread: HP 9000 Series 300 Video Help

  1. #1

    Default HP 9000 Series 300 Video Help

    I recently came into possession of an HP 9000 Series 300 - specifically a 310 - and have a question regarding the video output.

    I connected my Zenith Data monochrome monitor and it seems to almost work. I can see the output from the processor board, but there are three columns of the same information?! I've attached a few photos.

    2019-07-17 10.05.21.jpg2019-07-17 10.05.39.jpg

    I can't seem to find any information regarding the signal output from the processor board, so I'm not sure if this is a problem with the processor board, or with my Zenith monitor.

    Any help would be greatly appreciated!


  2. #2


    The horisontal scan frequency of the original HP 35731 monitor is 24.9 - 25.8 kHz. Does your Zenith cope with that?

    Look here for more info:

  3. #3


    Thanks MattisLind! That's a good point. After some research, I can't seem to find any specifications for the horizontal refresh rate of the Zenith 121. The only mention I find is the US standard 60 Hz vertical refresh rate, and a claim of 15 MHz bandwidth. I'm by no means a monitor expert, but I guess I've never seen a monitor referred to in terms of its "bandwidth."

    Again, thanks for the information!




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