Set the specified entry of the clut, using the Bits++ box and our
frame buffer conventions.
Prior to using this routine, Bits++ box must be in
framebuffer load mode.
This routine is not required to be speedy, and it isn’t.
xx/xx/02 jmh Wrote it, but didn’t comment.
2/23/03 dhb Added comments.
2/28/03 dhb, ptw Add delay to make sure glitch has settled.
Changed name, fixed up.
3/8/03 dhb Remove call to bitsplus.