Basic Disk Operating System (BDOS) Functions
The Rename File function changes all directory entries
of
the
file
specified by the file
name in the first
16
bytes
of
the FCB addressed by D X
to
the file name in the second
16
bytes.
It
is
the user's responsibility to insure
that
the file names specified are
valid, unambiguous,
CP/M
file names. The drive code "dr"
at
position 0
is
used
to
select the drive, while the drive code
for
the new file name
at
position
16
of
the FCB
is
ignored. Register AL returns a value
of
zero if the rename was successful
and
OFFH (255 decimal) if the first file name could
not
be found
in
the directory scan.
RETURN
LOGIN
VECTOR
ENTRY
CL: 18H
BX:
Login
Vector
FUNCTION
24
RETURN
LOGIN
VECTOR
RETURN
BX:
Login Vector
The
Return
Login Vector function returns the login status for up
to
16
disk drives in
a login vector. The login vector
is
a 16-bit value in register BX. The least significant
bit corresponds
to
the first drive, labelled A,
and
the high order bit corresponds
to
the sixteenth drive, labelled P. (The
APC
currently supports 8 drives). A "0" bit
indicates
that
the drive
is
not online. A "1" bit marks a drive
that
is
actively online
due
to
an
explicit disk drive selection
or
an
implicit drive select caused by a file
operation which specified a non-zero
"dr" field.
RETURN
CURRENT
DISK
ENTRY
CL: 19H
FUNCTION
25
.
RETURN
CURRENT
DISK
RETURN
AL: Current Disk
The
Return
Current
Disk function returns the currently selected default disk
number
in register AL. The disk numbers range from 0 through 15, corresponding
to
Drives A
through
P. Drives A
through
H (0
through
7) are currently
supported
on
the APC.
4-19
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