This routine is only available on Doors CSE 8.0 and later for the color-screen TI-84 Plus C Silver Edition.
Utility functions used when setting up an xLIBC program. real(0,0) gets the current xLIBC version, real(0,1,<bool>) turns half-resolution mode on or off, and real(0,20,<bool>) turns fast (15MHz) mode on or off.
real(0,0): Returns version in Ans
real(0,1,1,REDRAW_STATUS): Enable half-resolution (160x240-pixel) mode
real(0,1,0,REDRAW_STATUS): Disable half-resolution (160x240-pixel) mode
REDRAW_STATUS = 1 to redraw the status area at the top of the screen, 0 otherwise.
real(0,2,0): Disable fast (15MHz) mode, switching to 6MHz mode
real(0,2,1): Enable fast (15MHz) mode
VALUE defines action to take:
0 = FULL colour
1 = 8COLOUR
2 = COLOURINVERT
3 = COLOURINVERTOFF (restore to normal)
4 = FILLSCREEN
To invert the colours on the screen:
To restore the colours back to normal:
This is because inverting something twice will restore it back to normal.
To restore the colours back to normal when you don't know the previous state of the screen:
To FILL the screen (active GRAM side only) with a colour from the standard xLIB 256 colour palette: