API version1.
API put_char version 2.
put char ok.
use api put string hello.
API use INT 0x40 call.
hello.hrb.
hello.hrb 2.
api show string.
hrb_api.
add cons_putstr[01].
set and get CS.
C env.
C env, hello3.
C env. and auto run. no modify.
app_start. OS protect.