Syntax SET_RED #channel, operation
Location Windows (DIY Toolkit - Vol W)

This command is similar to SET_GREEN - the only difference is that instead of affecting green bits, it alters the red bits. The effect that this command has on the specified window depends upon the value of operation:

Operation Effect
0 Clear all Red bits (remove any Red from the screen).
1 Set all Red bits.
-1 If the Green bit for a pixel is set, Set the Red bit, otherwise clear it.