then theres those of us that take old tvs and make walls of tvs to display games or animations at parties and such On Fri, Dec 7, 2018 at 12:01 PM John Foust via cctalk <cctalk at classiccmp.org> wrote:

BLASPHEMY! Noooo! There are no LCDs that are 4:3 above 21". Not 25", not 27/29" models. The arcade geeks have a database of curb found TV models, what tube is in them by part #, yoke coil ohm readings and neck connector. That way they can match up 19" tubes to Wells Gardner, Electrohome, Sanyo and other arcade monitor chassis to replace the burned in tubes from games that didn't change home screen enough (Pac Man, Ms Pac, Centipede, etc.) There are people that take classic games, throw in crap 19" LCD panel and a $40 60-in-1 board and sell them for $2000. But that's not the collectors. -- : Ethan O'Toole

I know digital TV is compressed, but I didn't think that the video link from the TV machinery to the display is compressed. That's HDMI, which is a derivative of DVI, which is an uncompressed pixel stream. Or am I confused? You don't get compression artifacts when displaying computer displays on an LCD panel. Does a plain LCD panel have delay? If not, what about a TV used as a monitor? My new 4k TV can display HDMI from my laptop. But it offers to do image processing on it, which I turned off because I don't want my display messed with. That suggests it might be doing buffering in order to have a chance to do that manipulation. paul

We had an arcade game at MAGFest (Music and Gaming fest with a computer museum room in the greater DC area) that used dual LCD TVs from a hdmi splitter. The players complained that the one side was too laggy. Friend put a LCD latency test unit on the displays, and sure enough one screen was about 30ms behind the other. Playing with the test widget (it's a box with a hdmi cable, box goes against screen and detects the flashing) the top of the screen and bottom of screen is definitely off a chunk of time as the rows are scanned in order across the panel (at least on TVs we had.) We swapped it out. The LED video wall stuff I play with scans the image in every 8 lines, but it's much slower than a TV. I don't know how humans do it, but on some of the music rhythm arcade games that use LCDs it's desired to have the original LCD over any replacement since the timing of the game is meant for it. People have made hacked DLLs that allow adjustment of timing windows but it's never as good as the original, which is why the original LCDs sometimes go for $5000. These games are imported from Japan. How does a human do this? You hit the button as the line comes to the bottom of the screen where the solid line is across the bottom. This is why the timing is important: https://www.youtube.com/watch?v=Oy2h2yDKYyY https://www.youtube.com/watch?v=0nGhSAoQqcA (Those aren't really on fast, the games go quite a bit faster than that even) - Ethan -- : Ethan O'Toole