Re: Help needed: Emulation of AppleII Graphic modes

[me@lazilong.com (Lazarus I. Long)]

you have guessed correctly.  I actually use a 5 pixel window, since 4
pixels is not enough information in certain cases.  when looking at a
5 pixel window, the one you're coloring is the center one.  and you
assume that there are 2 extra pixels on each side, with value 0.  so
you won't get a "blob" on the edges (since the pixel is dark) but you
CAN get the color bleeding on the leading pixel on the left edge, and
the trailing pixel on the right edge.

yes, you need 562 pixels to include the color bleeding accurately.

happy to send you the code if you want it.  for pictures and examples
and screenshots go here:
http://www.lazilong.com/apple_II/a2pix/

> a) What size do the hires pixel have (I assume 1/280 i.e. 2/560, not 1/560)
correct

> b) What happens if there are two bytes, the first with highbit on, the second with highbit off, like 0000001-1 0000000-0?

you will loose the 2nd 1/560 pixel.  it just "goes away"  IIRC and you
get lowrez color there

:)