Int 21/AX=3303h

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DOS 3.4/4.0 - GET CURRENT CPSW STATE

AX = 3303h

Return:
DL = current CPSW

Notes: This function and AX=3304h were intended to support a proposed code-page switching flag (using the WORD at offset 0Ch in the DOS directory entry for codepage information); however, this function has always been a NOP in public releases of DOS and OS/2. See _DOS_Internals_ Chapter 2 for more information.. The released MS-DOS 4.00 IO.SYS has an undocumented CONFIG.SYS directive named CPSW= and that beside others the MS-DOS 4.00 ATTRIB supported a number of undocumented special parameters for "predefined" Extended Attributes (EAs) e.g. ATTRIB filename [(CODEPAGE|CP)[=new_value]].. This function does not use any of the DOS-internal stacks and may thus be called at any time. It is directly dispatched from the INT 21h entry point with interrupts disabled.

See Also: AX=3304h

Category: DOS Kernel - Int 21h - D

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