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These functions provide the capability to invoke DOS functions directly from
a program.  The following functions are defined:

bdos
    DOS call (short form)

dosexterr
    extract DOS error information

_dos_allocmem
    allocate a block of memory

_dos_close
    close a file

_dos_commit
    flush buffers to disk

_dos_creat
    create a file

_dos_creatnew
    create a new file

_dos_findclose
    close find file matching

_dos_findfirst
    find first file matching a specified pattern

_dos_findnext
    find the next file matching a specified pattern

_dos_freemem
    free a block of memory

_dos_getdate
    get current system date

_dos_getdiskfree
    get information about disk

_dos_getdrive
    get the current drive

_dos_getfileattr
    get file attributes

_dos_getftime
    get file's last modification time

_dos_gettime
    get the current system time

_dos_getvect
    get contents of interrupt vector

_dos_keep
    install a terminate-and-stay-resident program

_dos_open
    open a file

_dos_read
    read data from a file

_dos_setblock
    change the size of allocated block

_dos_setdate
    change current system date

_dos_setdrive
    change the current default drive

_dos_setfileattr
    set the attributes of a file

_dos_setftime
    set a file's last modification time

_dos_settime
    set the current system time

_dos_setvect
    set an interrupt vector

_dos_write
    write data to a file

intdos
    cause DOS interrupt

intdosx
    cause DOS interrupt, with segment registers