Warning:
Do not run PMCON.EXE or PMCOFF.EXE it in real mode,
use CHON.EXE and CHOFF.EXE for real mode (DOS).
Do not run CHON.EXE or CHOFF.EXE in protected mode or V86 mode.

CHON.EXE   enables Cache on 486 or hiher CPUs in real mode (plain DOS)
CHOFF.EXE  disables it
PMCON.EXE  enables Cache on 486 or higher CPUs in protected or V86 mode
           (if running in a DPMI-Environment (Windows 95 or 98))
PMCOFF.EXE disables it
