KVM Switches and broadcasting keystrokes to multiple PCs

Posted on 2005-04-09
Last Modified: 2010-04-25

I've been looking for quite some time for a way to sniff keystrokes for a legacy DOS system, and just yesterday found out about KVM switches.  But we need a KVM to broadcast keystrokes to two machines, simultaneously.

Does anybody have experience with this or know what brands or models can provide me with this capability?

Thanks a lot for the help,
Question by:ba272
    LVL 11

    Accepted Solution


    Author Comment


    es, exactly.  In fact I first learned about KVMs on the NetworkTechInc site.  We plan on talking with these folks about the cost, but are worried that they will be out of our price range.

    I was hoping for somethine less commercial grade and more consumer grade, to get the price into a different range.

    Any thoughts?  We just need to broadcast the keystroke to two computers, that's out only requirement.  Or, if we could give the keytrokes to the DOS computer and somehow have them logged on the Windows computer.  That would work too.

    LVL 11

    Expert Comment

    LVL 11

    Expert Comment

    also not a bad switch:
    but from a german maker...

    LVL 31

    Assisted Solution

    You don't need a KVM switch, it looks like you need a splitter for the KB. A KVM switch typically will direct KB/mouse/video to one machine at a time and you want KB input to reach 2 computers in parallel. I'm not sure such a thing exists as a consumer item, but it is probable. I suppose one could be made up, assuming the KB inputs on the computers are the same (e.g. PS/2 on both) by branching off (some of) the cable leads to a secondary KB plug that goes into the second machine. Some caution must be used, so as not to connect the +5 V supply leads from the KB ports together. I haven't done this myself, so I can't give any guarantees; based on the pinouts and the specs of a normal KB and PS/2 port it should be doable, though.

    I found a few references to a software-based KB input splitting, but those were for UNIX. That would of course be a very elegant solution if both your programs can be run on one computer.

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    Better Security Awareness With Threat Intelligence

    See how one of the leading financial services organizations uses Recorded Future as part of a holistic threat intelligence program to promote security awareness and proactively and efficiently identify threats.

    Windows 7 does not have the best desktop search built in. This is something Windows 7 users have struggled with. You type something in, and your search results don’t always match what you are looking for, or it doesn’t actually work at all. There ar…
    In this sixth video of the Xpdf series, we discuss and demonstrate the PDFtoPNG utility, which converts a multi-page PDF file to separate color, grayscale, or monochrome PNG files, creating one PNG file for each page in the PDF. It does this via a c…
    Sending a Secure fax is easy with eFax Corporate ( First, Just open a new email message.  In the To field, type your recipient's fax number You can even send a secure international fax — just include t…

    758 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    13 Experts available now in Live!

    Get 1:1 Help Now