User`s guide

Function 100 also requires that the referenced directory contain SFCBs to activate

date and time stamping on the drive. If an attempt is made to activate date and time

stamping when no SFCBs exist, Function 100 returns an error code of OFFH in

for date and time stamping by placing an SFCB record in every fourth entry of the

directory.

Function 100 returns a Directory Code in register A with the value 0 if the direc-

tory label create or update is successful, or OFFH, 255 decimal, if no space exists in

the referenced directory to create a directory label, or if date and time stamping was

requested and the referenced directory did not contain SFCBS. Register H is set to

zero in both of these cases. If a physical error or extended error is encountered,

Function 100 performs different actions depending on the BDOS error mode (see

Function 45). If the BDOS error mode is the default mode, a message identifying the

error is displayed at the console and the calling program is terminated. Otherwise,

Function 100 returns to the calling program with register A set to OFFH and register

H set to one of the following physical or extended error codes:

01 Disk I/O error

02 Read-Only disk

04 Invalid drive error

07 File password error

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BDOS Function Calls CP/M 3 Programmers Guide