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![](images/i.jpg) *While these requirements are no problem if you're simply calling a subroutine in order to save an image from your program, they pose a considerable problem if you're designing a hot-key operated TSR that can capture a screen image at any time. With the EGA specifically, there's never any way to tell what state the registers are currently in, since the registers aren't readable. (More on this issue later in this chapter.) As a result, any TSR that sets the Bit Mask to 0FFH, the Data Rotate register to 0, and so on runs the risk of interfering with the drawing code of the program that's already running.*
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![](images/29-02.jpg)\
**Figure 29.2**  *Color translation via the palette registers.*
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* * * * *
Graphics Programming Black Book © 2001 Michael Abrash