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Forum Index : Microcontroller and PC projects : CMM2 via VGA-Hdmi Converter to KVM-Switch
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| Wolfgang Regular Member  Joined: 03/11/2021 Location: GermanyPosts: 87 |
Hallo experts, I apologise if I am possibly revisiting an old topic here. I would like to use my monitor for both tasks: HDMI (from my PCs) and also the CMM2-VGA via my KVM switch. My KVM switch has HDMI-video inputs, so a VGA-HDMI converter could be connected between KVM-switch and the CMM2. Has anyone tried connecting a CMM2 to such a KVM switch (HDMI inputs) via a VGA-HDMI adapter for using only one monitor? Does this makes sense, or are there any reasons not to do so? Wolfgang |
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Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 8661 |
Awww... And I was so looking forward to ordering a MicroMite Plus. ;) I must confess that I've not used a VGA to HDMI converter, only the other way so that I could use an old monitor with a Raspberry Pi. I think your idea will *probably* work, after all VGA is a very basic linear system. The converter from VGA to HDMI should be taking care of everything to make the signal HDMI compatible. After that the KVM is merely switching the signals. I suspect that, if you have any problems, it will be with your monitor re-synchronising to a different resolution. That can sometimes be a bit slow. There is also the case that the VGA-HDMI converter will almost certainly have to be a "proper" active one and not a very cheap Chinese knock-off which might or might not work. They aren't that expensive now anyway. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 5761 |
The mouse on CMM2 is PS2, not USB, despite the USB connector. You need a converter to run it through a KVM switch. Volhout PicomiteVGA PETSCII ROBOTS |
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| Wolfgang Regular Member Joined: 03/11/2021 Location: GermanyPosts: 87 |
at the moment, my monitor is cycling through all four video inputs before finally displaying the VGA connection. This thake some time. Could this be resolved with an EDID function on the VGA-HDMI converter? Would it be possible to set the CMM2-VGA pin 9 to +5V or to use an EDID emulator for this purpose? |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 8661 |
I've no idea. VGA has no equivalent of EDID so it would be a function of the converter, which may or may not handle VGA pin 9. You probably need a full specification of the converter. Good luck with that unless you are getting a big name commercial one. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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PeteCotton Guru Joined: 13/08/2020 Location: CanadaPosts: 614 |
I use my CMM2 with an HDMI output going into a Monitor Switcher (not KVM - just the display) and it works fine. I also have an HDMI video capture card that has a CMM2 going into it (via VGA to HDMI) so that I can open the Windows Camera app, switch it to the video capture card and display the CMM2 display as a window on my desktop. This is how I primarily use the CMM2. As Volhout mentioned, the mouse doesn't play well with a KVM, so I do keep a separate keyboard and mouse for the CMM2. I'm using this for the VGA to USB output (note - it does require external power from a USB port). https://www.amazon.ca/dp/B083K83NNX?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_14 And using this for video capture https://www.amazon.ca/dp/B0CLNZ8267?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_33&th=1 And I use this for switching between HDMI inputs https://www.amazon.ca/dp/B071G4NXNH?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_5 |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9905 |
@ Wolfgang - Thanks for posting the new thread.  I'm sure you were.  Nice one, my son.  Smoke makes things work. When the smoke gets out, it stops! |
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