Category: DOS kernel
INT 21 - DOS 3.4/4.0 - SET CPSW STATE AX = 3304h DL = new CPSW state Return: nothing Notes: this function and AX=3303h 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. SeeAlso: AX=3303h,AH=11h,AX=5702h