INT 21,0 - Program Terminate

AH = 00

CS = ~PSP~ segment address

returns nothing

- restores the terminate, ~Ctrl-Break~, and critical error

exit addresses, flushes all buffers, frees memory

and returns to DOS via the termination handler address

- does not close ~FCB~s

- this function is no longer recommended, but can be used by

version of DOS before 2.0, see ~INT 21,4C~ and ~INT 20~