The two disks above have the following files:

EDIT    - The program. Load with EA Option #3.
EDIT_S  - The sourcecode.
CHARC   - The Character Color memory-image file. (2048 bytes)
CHARG   - The Character Pattern memory image file. (2048 bytes)

Enhanced Graphics Mode is an undocumented graphics mode of the TI. Technically,
it's bitmap mode, but instead of having three seperate tables for each 3rd of
the screen, you only use 1 or 2 tables for it, overlaping the values. This
allows you greater flexibility and also frees up a lot of VDP RAM for other
uses. It's also just as fast as standard mode in regards to CPU window
thresholds, so you don't lose any speed using it. The mode used in the editor
is the standard 1 table for both color and patterns, so you have 256
independently definable characters.

On a side note, there's only one minor flaw with using EGM, and that's you lose
the ability to quickly redefine colors, which you had thanks to the character
set seperation in standard mode. A minor price to pay for the increased color
depth.

This program allows you to directly edit the character set in EGM, and then
save the results to disk as memory-image files, which can then be loaded into
any program for instant definition. It can also be used for standard graphics
mode use, you simply don't use the color table.

There is two windows on the screen, a plotting window on the left, and the
character matrix on the right. You toggle between the two by pressing W. The
plot window has all 256 characters displayed, and you can plot the active
character by pressing Q. This allows you to see the effect of characters side
by side. On the matrix, you can toggle bits on and off by pressing Q. You can
also clear the matrix to 0's by pressing 0, 1's by pressing 1, or invert the
character by pressing 2.

You can change which character you're on by pressing < and > to go back and
forth. You manuveur your cursor on the windows by using I,J,K, and M.

If you press C, you change from the pattern to the color matrix. There's no
guide on screen for which colors are what patterns, but you can look these up
in any number of manuals for the TI. This isn't the most efficient way to
change colors, but a more advanced system is a lot more work to code.

Pressing Z will save the graphics and color tables to the memory image files on
disk. They will reload every time you start the program. I don't have a
"filename?" prompt because doing so is an intensive bit of code work, and it's
just easier to use a disk manager to copy the files to another disk and rename
them as needed.