I fired up my old CRT TV and also a supposedly good DVD player (Yamaha DVD-S1700), and my C128. Here are some pictures. I regret that I did't put in any text, just bars. Also ideally it would have been better if I had ran some demo code that changes background color on different parts of the screen, so everey text colour could be seen with actual text on every background color. C128 on my CRT with perfect delay adjustment: https://farm5.staticflickr.com/4341/36199895173_d6d220dd0e_o.jpg https://flic.kr/p/X9RVDF DVD on my CRT with perfect delay adjustment, different from C128: https://farm5.staticflickr.com/4401/36199898253_46044f37f8_o.jpg https://flic.kr/p/X9RWyM C128 on my CRT but delay adjusted for perfect picture with DVD. Notice white edge on the left of the yellow bar: https://farm5.staticflickr.com/4392/36199901303_e6b8da65eb_o.jpg https://flic.kr/p/X9RXtn C64 CRT but adjusted for DVD DVD on my CRT but delay adjusted for perfect picture with C128. Notice white edge on the right of the yellow "bars": https://farm5.staticflickr.com/4365/36199904113_2e6e656df6_o.jpg https://flic.kr/p/X9RYiP This is how my C128 looks on my modern Samsung plasma. I assume the TV set notices a delay and takes a bad guess how to adjust to the situation, making it even worse: https://farm5.staticflickr.com/4394/36199906213_a74e676c9d_o.jpg https://flic.kr/p/X9RYW2 C64 on modern Plasma This is how the DVD looks on my modern Samsung plasma. Good timing: https://farm5.staticflickr.com/4434/36199907713_10141c4544_o.jpg https://flic.kr/p/X9RZnT The picture quality could probably be a bit better if I used better cables to the CRT TV. As it only has one input (except RF) and since I modified it for S-video myself all signals pass through a DB25 4-to-1 "computer cable switch" and back in the days I made cables with DB25<->Scart and one of those cables has the chroma for S-video and S-video/composite switch signal soldered directly to a cable in the TV so I cannot change cables without doing some solder works. However there isn't much ringing in the signal, just maybe a bit low luma bandwith. I'm not alone getting this timing error. Look at the pictures on this blog: https://ilesj.wordpress.com/2012/11/17/c64-s-video-cable-the-easy-way-and-with-no-scart/ and https://ilesj.wordpress.com/2012/03/30/c64-av-cable-theory-and-practice/ (From the pictures we can assume that the combination of a C64/C128 and a modern Samsung flat screen gives a far worse picture than most other combinations, but if you look closely you will se a slight timing error on most of the other pictures aswell). Another blog with atleast one picture with severe timing error: https://www.commodoreserver.com/BlogEntryView.asp?EID=F4B967500A894E10BE4A104C65DB541E Look at the right (s-video) picture right below the text "Still a little bleed on bright reds". The blue color starts about a pixel or two to the right of the bright-to-dark luma transition to the left, and the chroma for red color is about a pixel or two to the right of the luma in the C in the upper right corner. If you click on the picture here and zoom in to 1:1 pixel ratio, you will obviously see that the red chroma is a fair bit to the right of the corresponding luma: http://www.retro-programming.de/retro-welt-2/hardware/lotkolben/c64-s-videokabel/ It's also slightly visible on this picture, showing the difference between stock C64 and C64 with modified analogue buffers in the RF modulator: http://oms.wmhost.com/modulator_vs_spider.png P.S. here is a picture where someone has modified their VIC-20 for S-video and gets incorrect timing but the other way around, chroma before luma: http://sleepingelephant.com/ipw-web/bulletin/bb/viewtopic.php?t=2477&start=105 -- (\_/) Copy the bunny to your mails to help (O.o) him achieve world domination. (> <) Come join the dark side. /_|_\ We have cookies. Message was sent through the cbm-hackers mailing listReceived on 2017-09-03 22:00:02
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