System information

FUNCTION 24: RETURN LOG-IN VECTOR

Entry Parameters:

Returned Value:

Registers HL: Log-in Vector

The log-in vector value returned by CP/M is a 16-bit value in HL, where the least significant bit

of L corresponds to the first drive A and the high-order bit of H corresponds to the sixteenth

drive, labeled P. A 0 bit indicates that the drive is not on-line, while a I bit marks a drive that is

actively on-line as a result of an explicit disk drive selection or an implicit drive select caused by

a file operation that specified a nonzero dr field. The user should note that compatibility is

maintained with earlier releases, because registers A and L contain the same values upon return.

FUNCTION 25: RETURN CURRENT DISK

Entry Parameters:

Returned Value:

Function 25 returns the currently selected default disk number in register A. The disk numbers

range from 0 through 15 corresponding to drives A through P.

5.2 Call Conventions CP/M Operating System Manual

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