firestorm

You right thorfdbg, I was in error. Please help to identify and match the colors from description on page 50-51. Any input welcome. I'm searching for correct colors of NTSC Atari. Atari Field Service Manual Should be the the safe starting point for adjusting color pot. http://www.retromicro.com/files/atari/8bit/cgia.pdf

Please here is pdf file Atari_400_800_Field_Service_Manual_June_82 68.pdf

Thank you very much Faicuai Are you getting color bar test and purity test in the same time right?

Help me find APX Color Aligment tool please. Can you attach it or point where I can find it?

Use SALT cartridge, that is the best method. Here you have description SALT205.rom.bin SALT 2.05.atr

Faicuai have you warm up Atari for 15 minutes? Now I can have Star Riders with bluish shields on Phase -33

Correct NTSC adjustment according CGIA Documentation page 50-51 http://www.retromicro.com/files/atari/8bit/cgia.pdf is to make SETCOLOR 2,1,8 look like this for HUE/Phase/Color Balance setting of TV/monitor at 0 And SETCOLOR 4,15,8 like that For Hue/Phase/Color Balance TV/monitor seting correct with Phase -33 SETCOLOR 2,1,8 SETCOLOR 4,15,8

1 Atari CGIA document states that reference color 1 is 76.5° from RGB Red it will be easy to define it in Altirra using RGB color wheel. 2 Next color is different from reference in phase by 24° (Altirra hue step 24°) 3 Colors are described in similar maner as in Basic Manual :1 Gold, 2 Orange, 3 Red Orange and so on.. to get these colors on screen you have 2 adjust phase -33 on your monitor. It makes sense because RGB Red witch is 76,5° minus 33° give us 43° of Golden Rod . 4 To adjust color pot on your Atari Color 15 has to look like this with Phase/Hue/Color Balance set to 0 or like that with Phase -33 5 Reference Color looks like this with setting Phase/Hue/Color Balance 0 or with Phase -33 (Gold) like that 6 On Atari NTSC you can't change reference color by adjusting color pot. This is RGB Wheel used by me so you can practice. http://www.rapidtables.com/web/color/color-wheel.htm

Atari document found today sheds new light on color adjustment. Do not use method described by me above because of a small error it creates. Sorry I will continue my research for correct colors on NTSC Atari computers. http://www.retromicro.com/ficgia.pdfles/atari/8bit/

CGIA document is real breakthrough! Holy Grail of my quest for Atari NTSC colors!

Found another proof of Atari NTSC correct colors, this time it's Atari GTIA internal confident document. Link below. http://www.retromicro.com/files/atari/8bit/gtia.pdf And Atari CGIA, page 50-51. http://www.retromicro.com/files/atari/8bit/cgia.pdf

That's a good idea, with composite and s-video hook up! And then just press A or B on monitor.

Try this one it really works and is easy. You need Basic cartridge of course

Based on Atari 400/800 Field Service Manual, there is simple way to adjust color pot on NTSC Atari computer without using SALT cartridge. Before you try this please keep your Atari switched on to warm up for 15 minutes. SETCOLOR 2,1,8 REM CHANGES BACKGROUND COLOR TO 1, PRESS RETURN SETCOLOR 4,15,8 REM CHANGES FRAME COLOR TO 15, PRESS RETURN Then adjust Atari color pot to make background and frame around the screen of the same color as possible.

Kogden I envy your Sony PVM-20L5 must be amazing for gaming

Ups.. it was for another topic but thank you Based on Atari 400/800 Field Service Manual, there is simple way to adjust color pot on NTSC Atari computer without using SALT cartridge. Before you try this please keep your Atari switched on to warm up for 15 minutes. SETCOLOR 2,1,8 REM CHANGES BACKGROUND COLOR TO 1, PRESS RETURN SETCOLOR 4,15,8 REM CHANGES FRAME COLOR TO 15, PRESS RETURN Then adjust Atari color pot to make background and frame around the screen of the same color as possible.

Based on Atari 400/800 Field Service Manual, there is simple way to adjust color pot on NTSC Atari computer without using SALT cartridge. Before you try this please keep your Atari switched on to warm up for 15 minutes. SETCOLOR 2,1,8 REM CHANGES BACKGROUND COLOR TO 1, PRESS RETURN SETCOLOR 4,15,8 REM CHANGES FRAME COLOR TO 15, PRESS RETURN Then adjust Atari color pot to make background and frame around the screen of the same color as possible.

I have PAL and NTSC Ataris 800XL and can confirm that both works very good. This is HD monitor with 800 lines resolution. Should work with Atari ST as well. I love this space between scan lines it shows precision. Just look. Atari is connected by s-video. To get this quality I had to disconnect TV modulator, C56 and C54 plus wire from R67/R68 to Croma pin.

Try this one! http://www.ebay.co.uk/itm/Sony-Trinitron-PVM-14L5-Multiformat-Color-Video-Monitor-/291258104979?pt=LH_DefaultDomain_0&hash=item43d055fc93