Table of Contents
Advertisement
Basic I/O System (BIOS) Functions
If an error occurs, the CBIOS attempts 16 retries to see if the error is recoverable.
When an error is reported, the BDOS prints the message "BDOS ERR ON
x:
BAD
SECTOR", where
x
is the drive specifier. The operator then has the option of
pressing RETURN to ignore the error, or CONTROL-C to abort.
Refer to Appendix I for information about blocking and deblocking.
WRITE SELECTED SECTOR
ENTRY
FUNCTION 14
WRITE
RETURN
AL: Return Code
OH,OFFH
This function writes the data from the currently selected DMA base and offset
address to the currently selected drive, cylinder (hard disk only), track, and sector.
This routine actually writes the data to a buffer at a fixed location and calls
R_ W _COMMON or R_ W _COMMONHD to perform the physical write.
The error codes given for Read Selected Sector (function 13) are also returned in
register AL for this function, with error recovery attempts as described for that
function.
Refer to Appendix I for information about blocking and deblocking.
RETURN LIST STATUS
ENTRY
FUNCTION 15
LISTST
RETURN
AL: Return Code
OH,OFFH
This function returns the ready status of the list device. The value returned in AL is
00 if the list device is not ready to accept a character, and OFFH if a character is sent
to the printer.
5-15
Advertisement
Table of Contents
