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dos functions
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bdos
bdosptr
delay
_dos_close
_dos_commit
_dos_creat
_dos_creatnew
_dos_findfirst
_dos_findnext
_dos_getdate
_dos_getdiskfree
_dos_getdrive
_dos_getfileattr
_dos_getftime
_dos_gettime
_dos_lock
_dos_open
_dos_read
_dos_setdate
_dos_setdrive
_dos_setfileattr
_dos_setftime
_dos_settime
_dos_unlock
_dos_write
dosexterr
_flush_disk_cache
getcbrk
getdisk
int386
int386x
int86
int86x
intdos
intdosx
setcbrk
setdisk