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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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