Q34469: MASM 5.10 MACRO.DOC: Device I/O

Article: Q34469
Product(s): See article
Version(s): 5.10   | 5.10
Operating System(s): MS-DOS | OS/2
Keyword(s): ENDUSER | | mspl13_masm
Last Modified: 12-JAN-1989

The following information was taken from the MASM 5.10 MACRO.DOC file.

DEVICE I/O

@Read (3Fh)

Reads data from a file or device

Syntax:         @Read &buffer, length [,[handle] [,segment]]

Arguments:      buffer      = Offset of buffer where data will
                              be stored
                length      = Length of data in bytes
                handle      = File or device handle; if none given,
                              keyboard (handle 0) is assumed
                segment     = Segment of address string (DS if not
                              given)
Return:         If carry clear, bytes read in AX
Registers used: Always AX, DX, BX, and CX; DS if segment
                changed

@Write (40h)

Writes data to a file or device

Syntax:         @Write &buffer, length, [,[handle] [,segment]]

Arguments:      buffer      = Offset of buffer where data is
                              stored
                length      = Length of data in bytes
                handle      = File or device handle; if none given,
screen
                              (handle 1) is assumed
                segment     = Segment of address string (DS if not
                              given)
Return:         If carry clear, bytes written in AX
Registers used: Always AX, DX, BX, and CX; DS if segment
                changed

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