UltimateBasic 64 1.5.6

Ultimate Basic v1.5.6 – Release Notes

2026-09-06 – Hires draw color + multicolor shapes

• Added color pen c: sets a persistent hires drawing color (0-15). The
  plot/line/rect/circle/paint helpers stamp it into the video-matrix
  foreground nibble of every cell they touch; the background nibble is
  preserved. Default is white (1), so programs that never call color pen
  render exactly as before. Emitted only when color pen is used, so the
  plot helper is unchanged for existing programs.
• Added multicolor shape commands mline, mrect, and mcircle (joining
  mplot). The trailing color argument is the 2-bit source (0-3); the
  actual colors come from the cell palette (screen / color RAM), exactly as
  for mplot. They reuse the hires Bresenham/midpoint routines via a shared
  draw-target switch, plotting each pixel through the mplot helper. mline
  and mrect require x in 0-159; mcircle clips off-screen points.