User`s guide

BDOS FUNCTION 28: WRITE PROTECT DISK

Entry Parameters:

The Write Protect Disk function provides temporary write protection for the cur-

rently selected disk by marking the drive as Read-Only, No program can write to a

disk that is in the Read-Only state. A drive reset operation must be performed for a

Read-Only drive to restore it to the Read-Write state (see Functions 13 and 37).

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BDOS Function Calls CP/M 3 Programmers Guide