Casio IT-2000D - Manual (Page 216)

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8.8 Reverse Video Utility
Overview
This utility is used to change the entire screen to reverse video.
From the nature of the FSTN semi-transmittive type LCD unit of this terminal the density of colors
(tones) will be reversed. So, for example, a light color appears dark and a dark color appears light.
To avoid this problem use this supplied utility to represent colors as closely as possible.
File name
LCDREV.EXE
Startup Method
This utility is not supplied on the basic drive (C:). Copy it in the F-ROM drive (D:) or RAM disk
(A:) before use. This program can be used either as a single command or as a child process.
Operation Method
Format: LCDREV Option
Option Function
0 Normal (Returns to default value at a time of boot up)
1 Only text is reversed
2 Only graphics are reversed.
3 Both text and graphics are reversed.