Hi Kent,

I didn't realize you needed info for DHR. Here's what I have
from my 2c (Apple version) reference. As you know, the DHR mode
is activated vi soft switches. Like wise, it uses data banks
from main ram and aux ram, and follows the HGR mapping method.
One half of the data is stored in aux ram. The screen size is
560x192.

DHR interleaves pixel in much the same way as the 80 column
text mode. The first pixels are in $2000 in aux ran. The
memory follows the HGR mapping.

The GS DHR colors are a little different to the 2c and 2e. You
can see the effect of this by comparing a 2e screen to a GS
screen. I remember the GS has extra soft switches that modifies
the graphics. As far as I can find out this is a GS feature. I
know this, 'cause I used to beta test for the author. He had a
GS and a Lazier, so the Lazier may be able to handle this color
variance. The best test for this is the freeware APEX system.
It has several graphics program.

Here comes the more technical stuff. :-)
The bytes in the main memory and aux memory pages are displayed
in the same manner as the 80 column text mode. Of each pair of
identical addresses, the aux memory is displayed first. Unlike
normal hi-res, DHR has no restrictions on which colors can be
adjacent. Color is determined by any 4 adjacent dots.
Effective color width is 140. It is possible to use the 560
mode in monochrome. There is of course a little color bleed but
not nearly as bad as the hi-res modes. DHR uses the low order
seven bits in the two graphics pages. The eighth bit is not
used, unlike the hi-res mode which uses it for color selection.

Here is a color map based for (2c) DHR. To use this, divide the
column number by 4 and use the remainder to find the correct
column. I.E. ab0 is a byte residing aux memory corresponding
to a remainder of 0 (bytes 0,4,8 and so on). nb1 is a byte
residing in main memory corresponding to a remainder of one
(bytes 1,2,9 etc) and similarly for ab2 and mb3

2c and 2e DHR color values. Note, the GS doesn't follow these
color values, according to the author of Apex. I guess he
programmed around the differences since any Apex graphics
program uses the GS color values shown below the bitmap colors.
Since Kegs is a GS emulator it makes sense to use the GS values.

   2c/e
   color     abo  mb1  ah2  mb3  4 bit pattern
 0 black     $00  $00  $00  $00  0000
 1 magenta   $08  $11  $22  $44  0001
 2 brown     $44  $08  $11  $22  0010
 3 orange    $4c  $19  $33  $66  0011
 4 drk green $22  $44  $08  $11  0100
 5 gray 1    $2a  $55  $2a  $55  0100
 6 green     $66  $4c  $19  $33  0110
 7 yellow    $6e  $5d  $3b  $77  0111
 8 drk blue  $11  $22  $44  $08  1000
 9 purple    $19  $33  $66  $4c  1001
10 gray 2    $55  $2a  $55  $2a  1010
0a pink      $5d  $3b  $77  $6e  1011
0b med blue  $33  $66  $4c  $19  1100
0c lite blue $3b  $77  $6e  $5d  1011
0d aqua      $77  $6e  $5d  $3b  1110
0e white     $7f  $7f  $7f  $7f  1111

GS color values (bits for color) This chart is based on info
from the Apex system.

black     0000
drk gray  0001
brown     0010
purple    0011
blue      0100
drk green 0101
orange    0110
red       0111
pink      1000
yellow    1001
green     1010
lt blue   1011
drk blue  1100
lt green  1101
lt gray   1110
white     1111

Here's an example based on a 4 byte 'window.
  x=unused bit
  o=used bit

          ab0     mb1     ab2     mb3
memory 76543210 76543210 76543210 76543210
       xooooooo xooooooo xooooooo xooooooo
screen x0123012 x3012301 x2301230 x1230123

As for the hires, there is no yellow or brown colors. The
primary colors are black (2), white (2), blue, orange, green,
purple. Although not in that order. All other colors were a
combination of different colors, dithered I guess.

I think the color mode that was mentioned is only available on
a system with a RGB card. This however was not a standard on
most Apple II systems. I have tried to duplicate this on a IIe,
a 2c and a gs with no luck. This is assuming the poke info is
accurate. I would love to see an emulator with RGB support to
see how some of my old games play.

Thanks again for a really great GS emulator. I am always
telling people about it's advantages. At least one of which
allows you to manipulate files on SCSI drives which can be be
used by an Apple II. I have verified this in the main NG. From
a couple of people.

-- 

Thank you for your time and interest. I hope it was helpful
or at least interesting.

Phoenyx,

Apple2 user since March 1984

Links to Phoenyx's pages:
preferred..... http://zip.to/Phoenyx_A2
alternate..... http://www.tinyangeldesigns.com/Apple2