Main > Monitor/Video Forum
HDMI to Old CRT
abstract3000:
Thanks again for all the Input, I am going to build a frame out of 2x4's this weekend to remove the tube from the cabinet and mount it into to protect the neck. This gives me the ability to move the monitor to his place for him to work on. I studied the Pinouts for the CGA/D9 & the VGA/D15 and I'm fine with either he decides to wire in there. As both pinouts have the R/G/B/GND/V-Sync/H-Sync connections it will be easy take the connection from point A to Point B and adapters are easy and cheap to come by if needed.
I chose the Asus AMD Radeon HD 6450 because I read somewhere that was one of the creators of CRT_Emudriver's personal video card at the time, so If any card will be compatible that will be one of them, and they are really really cheap. Thanks for the heads up on the ATOM-15 software I will look a bit further onto that. I finally feel relieved I know the path I'm taking, cause it was becoming a serious headache trying to figure out what converter that would work, just to find out it wasn't possible to get ahold of. I know at least know I will no longer be wrestling with the S-Video Adapter.
buttersoft:
After using RGB, i couldn't go back :)
Post some pics when you get it up and running! Or come back and ask questions, i guess. To be honest, this isn't really the place for crt_emudriver or GroovyMAME support, the GM subforum is best for that, but there is a monitor involved so i'll call that enough crossover :)
Zebidee:
--- Quote from: abstract3000 on September 11, 2023, 07:14:54 pm ---I studied the Pinouts for the CGA/D9 & the VGA/D15 and I'm fine with either he decides to wire in there. As both pinouts have the R/G/B/GND/V-Sync/H-Sync connections it will be easy take the connection from point A to Point B and adapters are easy and cheap to come by if needed.
--- End quote ---
Whatever way you prefer is fine, but if you go for a female Dsub15 (VGA) port on the TV, you won't even have to worry about pinouts. Just use any common/standard/ubiquitous/cheap VGA male-male cable to connect your computer.
Note that, whatever connection you choose, the separate H+V sync must be combined into a single composite sync for the TV. Your mate doing the RGB modding should be aware of this.
The simplest way is to twist the H+V wires together and run it through a resistor in series (people commonly use values between 470R and 1K). The resistor is to bring the sync voltage from ~4-5v to ~0.3v for TVs. This "smushy" sync that isn't 100% perfect, but will work OK with about 99% of CRT TVs. Most people are pretty happy with this.
An alternative is to run CRT_emulator with composite sync. This is a better quality sync, but for many TVs you might not see any difference. Composite is only output on VGA pin 13, so no twisting H+V together, but you still need the resistor in series. You would want to leave off/disconnect VGA pin 14 (V sync) to avoid ghost signals from leaving it "floating".
You can even wire up your own simple composite sync circuit too, is pretty easy with some cheap logic chips or transistors, but this is probably more than you want to do.
abstract3000:
I can definitely post photos, there is a lot of blunders in the Case my late teenage brain thought would be ok opposed to my now, and I can give some before and after shots of the monitor, wiring etc. Though for the meantime this is a picture of the cabinet up and running from sometime i think in ~2003?
Thanks for all the Help and More Pics & Questions to Come I'm sure :)
abstract3000:
Well got a snapped photo today, RGB done as well my friend added an Auto Power on Circuit to the TV :)
More photos to come!