Hence, depending if a dot is on an even or odd position, an artifact color appears, unless it's a sequence of dots (white, as they can't be interpreted as a color signal).
APPLE II COLOR MONITOR GENERATOR
Programmers of hires games took that into account, so the colors look good.īut the designers of the character generator ROM for text mode did not know that their pixel patterns would end up in an Apple II. Hires mode uses only 7 bits per byte to define the dot pattern, and the 8th bit is used to introduce another 90 degree phase shift which turns the two basic colors purple and green to orange and blue (don't remember the order). being another one) the programmers could introduce 2 "artifact" colors other than the usual black (0000. So by arranging pixels to mimic the color signal (like 010101. In hires graphics, the Apple II generates the colors by an effect called "color artifacting": pixels get pumped at twice the NTSC color subcarrier rate. Thanks in advance for any help/insights that can be provided. I have attached some images to show what I am seeing. I also don't see much problem in graphics mode. If I only plug the RCA cable part of the way in, without the ground making contact, it seems to be much better. The caps in the power supply look fine as well but could still have issues. I have only replaced the RIFA cap in the power supply but can replace the others if that may be the cause. The monitor is a Samsung TV/LCD Monitor combination.
It does appear to be some sort of rining or perhaps a ground loop. I did take out the 10uF electrolytic cap in that area of the motherboard, tested it (with a multuimeter with capacitance measurement), and it appears to be fine. I compleley cleaned the machine and have inspected the area around the video circuitry and don't see anything of concern. Apart from this issue the computer runs flawlessly.
When I turn on the computer I see color ghosting/banding around the characters. I have recently acquired an Apple IIe and I'm hoping someone here can help me with an issue I'm having.
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