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Forum Index : Microcontroller and PC projects : I need to use a VGA TO HDMI adapter on my CMM2
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| mclout999 Guru  Joined: 05/07/2020 Location: United StatesPosts: 469 |
I know we all once discussed this but now I am forced to use an adapter because My old gaming monitor DIED and now I only have a HDMI input available for the CMM2. I needed DP for a new GTX 3070 ultra Gaming card and very few monitors have VGA now days. I have an VGA to HDMI adapter have one I got back when the last discussion on this was aired but it shifts the image off the the right and cuts off about one column. Dose anyone use or know of an adapter that dose not cut any of the columns off that you can suggest. I am in the US so mostly NTSC and yes I looked at every setting for my monitor(an amazing deal from Amazon with 165MH refresh and 1ns speed and Active sync). Thanks for any suggestions. |
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homa Guru Joined: 05/11/2021 Location: GermanyPosts: 351 |
I bought this adapter here for 10 EUR from Amazon and the adapter works for me on the PicoMiteVGA with my monitor. https://www.amazon.de/dp/B08SR7FCRM However, since the adapter needs USB power, I connected the two devices with a USB-C Y-cable to USB-Micro ;-)  |
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bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2914 |
Hi MC999, I have one that looks identical to the unit Homa showed above and it works well on the CMM2. Regards, Mick Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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| mclout999 Guru Joined: 05/07/2020 Location: United StatesPosts: 469 |
It shows the full screen then? If so I have seen several of them that look like that. Dose it have sound out as well? I can not see that from his pic. Thanks Edit: I went to his link and it dose have audio out. What was I thinking! Edited 2023-04-11 03:25 by mclout999 |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
VGA never has audio out, it's not supported. Some VGA-HDMI adapters let you send audio *in* so that it comes out of the TV/monitor though. If the screen display s wrong then, providing you are using a supported VGA mode, it's just as likely that the TV/monitor is wrongly set up as it is that the converter is at fault. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| homa Guru Joined: 05/11/2021 Location: GermanyPosts: 351 |
Yes the Amazon image is incorrect. But the delivered adapter has the correct labelling and an audio input! ;-) .jpg) |
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Plasmamac Guru Joined: 31/01/2019 Location: GermanyPosts: 554 |
What screen mode is working? Plasma |
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| homa Guru Joined: 05/11/2021 Location: GermanyPosts: 351 |
Both. Mode 1 and 2. Or do you mean the resolution on the monitor? See picture ... 640x480-60Hz  Matthias |
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| mclout999 Guru Joined: 05/07/2020 Location: United StatesPosts: 469 |
I ordered one that looks like that one but has different branding from Amazon so I can always send it back for free. I hope this one works. |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2137 |
It may be worth testing the adapter on another monitor or TV. The output of the PicoMiteVGA does not match the default VGA settings on two monitors I have tried. The left hand side is cut off. Just required horizontal position adjustment on one but on the other moving the image to the right still left a missing strip on the left. Found a "Horizontal Phase" setting that fixed it. The issue appears to be the delay between the horizontal sync. pulse and the start of the line. I think the Pico adheres to the standard but not all monitors do. |
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| mclout999 Guru Joined: 05/07/2020 Location: United StatesPosts: 469 |
The issue is on the CMM2 but I have tried it on 2 other HDMI monitors and mixed results but not centered or fully on screen. |
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| mclout999 Guru Joined: 05/07/2020 Location: United StatesPosts: 469 |
Update: I got that adapter and it has the same issues of being shifted over to the right and cutting off a column or most of it in some modes. I did find that mode 11 was the only perfect fit and some of the really low res modes did display all the columns but still shifted over some. That was a bust. I tried it on all 3 of my CMM2s and it is just the same. I wish that the Firmware had a option setting that would let you shift over the columns like a positive or negative number for a offset left or right. Any possibility of that happening? Well thanks for the help. |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
Have you done the clock mod on those CMM2s? I found that on the one that I built, using the module, I had all sorts of problems in most modes until I fitted the new clock - then all was perfect. That was into a VGA input of a monitor, so it was producing poor VGA to start with. Conversion to HDMI would have been hopeless. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| mclout999 Guru Joined: 05/07/2020 Location: United StatesPosts: 469 |
All my units came with the mod from the get go and have had rock solid VGA output. The issue is that using one these VGA to HDMI adapters just does not work well. They probably all use the same cheep chip sets and the output from the CMM2 is just a little out of the standards those chips are built to. This really sucks. VGA as is slowly becoming a defunct input on monitors. I looked at a hell of a lot of monitors to find a replacement and only the older slower refresh and limited monitors had VGA inputs. I have a VERY GOOD Nvidia(3070 ultra Gaming) card now and it is best with a newer feature rich high refresh rate and active sync monitor. Maybe if I can afford something like a RetroTink video converter that has menus to fix thing like screen positioning but I am not affording anything soon. |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
Apparently this can sometimes be caused by the refresh rate of the display. It may be worth experimenting with that. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2914 |
Hi MC999, My one has a 3.5mm jack so that audio can be played through the HDMI cable if your monitor supports it, I haven't tried that feature. My results showed what I consider to be a near perfect image (well to my nearly 65 year old eyeballs) including the 1080p mode on the G2. There is however a small delay between mode changes and sometimes the input to my monitor changes back to HDMI 1 (the main PC input) when it changes modes which is a pain but I put up with that and I have not noticed any missing characters on the left or right of screen. I will try to do some tests (and pictures) in the next few days for you. Regards, Mick Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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| mclout999 Guru Joined: 05/07/2020 Location: United StatesPosts: 469 |
Hi bigmik The clarity of the screen is very good but the right shift is bad on the 3 different adapters I have tired. Some times it is not so bad in a game but it just bugs the sh*t out of me that it is just not centered and that last column is cut off. On my old VGA compatible monitor displayed everything perfectly. Mode 11 is the only one that displays right but that mode is not so good for many games because the overhead of all that RES makes it a slow mode. Do you see on you adapter that most modes are shifted right like I do? The mode switches are vary slow on mine too. |
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| mclout999 Guru Joined: 05/07/2020 Location: United StatesPosts: 469 |
I believe that refresh rates are set by the input device and as the CMM2 has no options to set refresh rates there is no way to change them from the Monitor that I know of. In an OS like windows you can set refresh rates because the OS can read the available rates from the monitor and then can change them. There is some form of protocol in monitors that provides information like native RES and available refresh rates. The OS can automatically chose a safe rate and RES but allows you to override those settings to best fit your use case. The new monitor is only 1080 but it has up to 165mh refresh and active sync that make my AAA game LOOK AMAZING. Graphic tearing that was constant on my old 60mh monitor is nonexistent with 165mh and active sync on. I have tried the CMM2(both 1st and 2ed Gen) on 2 TVs and 3 monitors but any use of the VGA TO HDMI shows the same right shift and column lost. I have also use 3 different adapters. |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
You aren't going to get the CMM2 to read the monitor data or to send config data to it. That's done over a digital interface that isn't there. The CMM2 is generating VGA to spec, as far as I know, or at least within normally acceptable tolerances and HDMI isn't an option (IIRC it uses LCD display hardware on the chip to generate VGA instead). I have a horrible feeling that the CMM2 simply isn't compatible with that fancy monitor. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 4043 |
I don't pretend to know anything (this sounds suspiciously like hardware), but can you control the aspect ratio on the monitor ? Whilst the CMM2 spits out 4:3 (?) most modern monitors default to some sort of wide-screen. Best wishes, Tom Edited 2023-04-14 07:21 by thwill Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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