Syntax:
set terminal atari {<fontsize>} {<col0> <col1> ... <col15>}
The character size must appear if any colors are to be specified. Each of the (up to 16) colors is given as a three-digit hex number, where the digits represent RED, GREEN and BLUE (in that order). The range of 0-15 is scaled to whatever color range the screen actually has. On a normal ST screen, odd and even intensities are the same.
Examples:
set terminal atari 4 # use small (6x6) font set terminal atari 6 0 # set monochrome screen to white on black set terminal atari 13 0 fff f00 f0 f ff f0f # set first seven colors to black, white, red, green, # blue, cyan, and purple and use large font (8x16).
Additionally, if an environment variable GNUCOLORS exists, its contents are
interpreted as an options string, but an explicit terminal option takes
precedence.