According to the Apple III Plus Owner's Guide, the interlace mode is called "text interlace":
text interlace a Feature of the Apple III console that, when activated, increases the resolution of text characters on the display screen.
Page 39 provides a little more detail:
So "text interlace" is simply a mode designed to enhance the appearance of text ...
There's a seller on Yahoo Auctions in Japan named
michael_torojirou who makes cables for pre-90s computers. Over the
last several years has sold a lot (several thousand, from the looks of
it) of them with consistently good feedback, so it's likely that they
From his offerings for cables that connect 8-pin DIN digital RGB
outputs to various kinds of ...
[This is a community wiki post. However, if you don't have enough reputation to edit it, or just don't feel like doing the work, feel free to post a comment on it linking to the source of a pinout that's not yet here and I will add it to the post --cjs.]
This won't help with determining if there are any formal standards, but we can at least figure out if ...
Is there a common (even if informal) standard for these,
No, it has been different from the begining. Not even the ubiquitous MSX standard could establish a unified connector and even less a pinout.
In later years SCART/JP21 established a common use by market force, as it became a standard for TV sets in Japan and large parts of Asia. Still, compatibility ...
If you are going to do this "properly", @mcleod_ideafix's pipeline of circuits to extract the luminance and then re-encode it onto just the green channel is the way forwards. I would enhance the design by adding some sliders/pots to allow tuning the exact RGB colour, since "green" monitors and colour monitors did not always use the same shade of green ...
For example, could Sega Genesis play heavier games if its video chip
were replaced with a second Motorotola 68000 (8 Mhz) in the program of
which video algorithms would be implemented?
No, it would be slower - much slower. The Yamaha YM7101 VDP can display 80 32x32 pixel sprites (20 per scanline), over 2 tile maps which can be freely scrolled vertically ...
As you surmise, one way of dividing up graphic image generation is
into two parts: building a bitmap in memory (with or without hardware
assistance) and then converting the bitmap into a video signal. And
that is how modern graphics cards do this.
Some older systems also did this, but as well there were three other
common methods of dividing up the work.