Get Number of Local Drives

Server

N

Station

Y

Interrupt

21h

Input

Output
AX FFh 00h   Activation Flag AX
BX          
CX   05h     CX
DX     Pointer to Table ES:BX 
Activation Drive:

        0=A, 1=B, 2=C,...

Table Format:

        LocalDriveNumber     db      ?

        For example, a WorkStation equipped with 2 floppy, 2 hard disk and
        one RAM disk drives logs-on to TopWare; the location referenced by
        ES:BX will contain the number 5.


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