I've been able to spend some time on the colour testing software. It's main purpose is to test the colours, for adjustment purposes. It accomplishes that, and a bit more. See the attached file below.
The main screen shows all 16 colours in blocks in two ways. The top half shows the colours in order, from 1 to 15, then 0. The bottom half also shows all of the colours (except one of the blacks), but with similar colours beside each other, to better highlight the differences (or similarities) between each, for instance, showing all three "green" colours in a row.
A cursor also flashes on the screen. The joystick can be used to move the cursor around the screen. Pressing the main fire button cycles the colours up, and pressing the secondary fire button cycles the colours down. The colour of the whole screen will change if a number is pressed on the keypad. Only numbers 1 through 9 are accepted, but if you press and hold a key on the second keypad (1 through 8 ), then press a number key on the first keypad, the numbers will be added (to access colours 10 through 15). If you don't want to use the second keypad, you can of course manipulate the blocks individually.
There is a little bonus added. The program uses mode 3, which is a 64 x 48 grid (of 4x4 pixels). Press the 9 key on the second keypad to access it. Now that I think about it, the control scheme is fairly non-user-friendly.
Anyway, using the first keypad, the colours of each 4x4 pixel can be changed the same way as described in the previous paragraph (sorry, the wholesale colour change is not available). There you have it - a brute-force pixelated drawing program.
Edited by 5-11under, Sun Dec 13, 2009 7:00 PM.