PROJECT REFERENCE
FAST / SLOW, VIC-II, AND VDC

The C128's FAST command switches the 8502 to its faster operating mode, but the
40-column VIC-II display path imposes important constraints. For the animated
bitmap modules, this project uses SLOW.

The 80-column VDC display is the natural place to use FAST in this demo. That
makes the mode switch itself part of the show:

SLOW + VIC-II GRAPHICS
  orbital plots, radar, waveforms, wireframes

FAST + VDC 80-COLUMN TEXT
  dense telemetry wall

A previous exit routine switched to 40-column text and then immediately used
FAST, which could make the final message disappear from the VIC-II display. The
corrected exit returns to SLOW before 40-column output.