Skyfox Posted January 30, 2021 Share Posted January 30, 2021 I am new to this forum and Atari computers. I was a Commodore guy growing up, but I was always intrigued by the Atari’s 256-color palette. Forty years later, I finally bought a 600XL from Ebay! It is paired with a Unocart and no disk or tape drive. Everything seemed to work great until I hooked an emulator up to the same TV and noticed some radical color differences, especially green becoming brown (see attached photos). Any ideas on what could be causing this? And, if so, how hard would it be to fix? All photos are from the same Sony flat WEGA 24” CRT TV, and taken with the same tablet camera. The right column is from David Firth’s ‘Atari 800 Emulator’ on an AMD E-2100 running Win 10 and CRT_EmuDriver 2.0. It produces 240p (15KHz) RGB non-interlaced output, which is then sent to an S-Video encoder. Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted January 30, 2021 Share Posted January 30, 2021 Try opening it up and adjusting the color potentiometer. Run the system first for a good 15 minutes or so with the case off before you make any adjustments to be sure the system is warmed up fully - the colors will drift as the board warms up. 1 Quote Link to comment Share on other sites More sharing options...
flashjazzcat Posted January 30, 2021 Share Posted January 30, 2021 Is the 600XL PAL or NTSC, and have you matched the TV standard in the emulator to the actual machine? The PAL and NTSC palettes have marked differences. Quote Link to comment Share on other sites More sharing options...
Skyfox Posted January 30, 2021 Author Share Posted January 30, 2021 I will definitely check out the color potentiometer. The 600XL is NTSC and the emulator is set to that as well. Do the emulator colors look correct to everyone? I don't have anything else to use as a reference. Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted January 31, 2021 Share Posted January 31, 2021 3 hours ago, Skyfox said: Do the emulator colors look correct to everyone? Yes, those emulator colors look correct. Quote Link to comment Share on other sites More sharing options...
BillC Posted January 31, 2021 Share Posted January 31, 2021 (edited) 4 hours ago, Skyfox said: I will definitely check out the color potentiometer. There should be no need to open the 600XL case to adjust the color potentiometer, it can be accessed through a hole in the case bottom under the left front corner and also through a hole in the upper RF shield when the top of the case is removed. It takes a small slotted tool. Edited January 31, 2021 by BillC 2 Quote Link to comment Share on other sites More sharing options...
Skyfox Posted February 2, 2021 Author Share Posted February 2, 2021 It worked, and I didn't even have to remove a single screw. Thanks to Dr V and BillC! 2 Quote Link to comment Share on other sites More sharing options...
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