Basic
110
System (BIOS) Functions
The
READ
and
WRITE
subroutines perform
24
retries before reporting
an
error
condition
to
the BDOS.
MOVE
TO
TRACK
00
ENTRY
FUNCTION
8
HOME
RETURN
This function returns the disk head
of
the currently selected drive
to
the
track
00
position.
In
the APC CBIOS, this subroutine does not actually perform the track 00
seek. Instead the call
is
translated into a call to function
10
with a
parameter
of
00.
The drive must have been previously selected by the
SELDSK
function (function 9).
Before accessing the disk, the routine initializes the sector
blockingl
deblocking
flags.
If
a "not ready" condition
is
detected, one
of
the following
error
messages
is
displayed:
FDC
HIW
ERROR
HDC
H/W
ERROR
to
identify the disk
that
the controller
is
unable to access. The system waits for
operator
input (R
to
retry, I
to
ignore) to continue.
5-11
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