Thomas Jentzsch Posted December 8, 2017 Share Posted December 8, 2017 (edited) Stella has an option which emulates color loss on PAL CRT TVs. This color loss, where only grays instead of colors are displayed, happens in Stella when the scanline count is an odd number and a PAL mode is selected. This has always been assumed to be correct. But there exist a number of ROMs, which produce an odd number of scanlines and are clearly meant to be PAL. This finally made me wonder. And therefore I wrote a simple test program and tested it on my own PAL CRT (14" Sony Trinitron KV-14LT1E), attached to my composite modded console. And no matter what number of scanlines I try, there is no color loss at all! Now I wonder if this is special for my TV/console combination (most likely) or if color loss doesn't work like we assumed for 20 years now. If you own a PAL CRT, please give the attached program a try. Use joystick up and down to change the number of scanlines. Do you get a colored picture for odd scanlines too? When you report back, please provide some details about the TV and the input (antenna, composite, RGB...) you have used too. Thanks in advance! ColorLoss.bin Edited December 8, 2017 by Thomas Jentzsch Quote Link to comment Share on other sites More sharing options...
Cambouis de l'Atari Posted December 8, 2017 Share Posted December 8, 2017 (edited) Hello ! My light sixer does lose its colors. It's that one : Connected to the crt through antenna (an old Philips that only have coax input) Some details about its behaviour : - each odd scanline count is grayscale - the display gets more fullscreen at 287 (60hz detection ?) - it starts to roll at 243 Don't you think the main difference is your composite connection ? Isn't the color coded another way than through antenna ? Hope this helps Edited December 8, 2017 by Cambouis de l'Atari 1 Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted December 8, 2017 Author Share Posted December 8, 2017 Thanks! I hope with more results we will find a pattern. BTW: Your TV sync limits are exactly mine too. Quote Link to comment Share on other sites More sharing options...
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