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CONFIG.SYS
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=== U{{nbnd}}Z === ;{{anchor|UMB}} {{mono|1=UMB}} {{nobold|(Embedded DOS<ref group="nb" name="embed"/> only)}} : Configures DOS management to use a specific segment as UMB memory. ;{{anchor|UMBSRV}} {{mono|1=UMBSRV}} {{nobold|(PTS-DOS only)}} : Configures the UMB server used. ;{{anchor|USERAM}} {{mono|1=USERAM}} {{nobold|(PTS-DOS only)}} : Specifies the address ranges used as UMB RAM. ;{{anchor|VERIFY}} {{mono|1=VERIFY}} {{nobold|(DR-DOS 7.02 and higher<ref name="Paul_1997_OD-A3"/> and Embedded DOS<ref group="nb" name="embed"/> only)}} : Enables or disables disk write verification. ;{{anchor|VERSION}} {{mono|1=VERSION}} {{nobold|(FreeDOS, Embedded DOS,<ref group="nb" name="embed"/> and EDR-DOS 7.01.07 only)}} : Specifies the DOS version (and optionally the true DOS version) to be reported to programs. ;{{anchor|VGASCREEN}} {{mono|1=VGASCREEN}} {{nobold|(PTS-DOS only)}} : Configures VGA display status. ;{{anchor|VIDEOMODE}} {{mono|1=VIDEOMODE}} {{nobold|(PTS-DOS only)}} : Similar to {{mono|1=SCREEN}} under FreeDOS, specifies current video mode. ;{{anchor|VIRTDMA}} {{mono|1=VIRTDMA}} {{nobold|(PTS-DOS only)}} : Specifies if virtual DMA can be used. ;{{anchor|VME}} {{mono|1=VME}} {{nobold|(OS/2<!-- possibly only late versions --> only)}} : Specifies if the processor's [[Virtual Mode Extensions]] (VME) should be deactivated or not. ;{{anchor|VXD}} {{mono|1=VXD}} {{nobold|(PTS-DOS only)}} : Configures VxD driver for Windows. ;{{anchor|WINDOWS}} {{mono|1=WINDOWS}} {{nobold|(PTS-DOS only)}} : Configures system support for Windows. ;{{anchor|XBDA}} {{mono|1=XBDA}} {{nobold|(EDR-DOS 7.01.07 and DRMK only)}} : Configures the relocation of the [[Extended BIOS data area]] (XBDA) ;{{anchor|XT}} {{mono|1=XT}} {{nobold|(PTS-DOS only)}} : Conditional execution on XT-compatible machines only. ;{{anchor|YEAR2000}} {{mono|YEAR2000}} {{nobold|(DR-DOS 7.02 and higher only)}} : Configures the built-in [[Year 2000 problem|Year 2000]] support. ;{{anchor|YESCHAR}} {{mono|1=YESCHAR}} {{nobold|(PalmDOS 1.0, DR DOS 6.0 updates and Novell DOS 7 and higher only)}} : Specifies the default Yes ({{keypress|Y}}) character in Yes/No/Resume queries.<ref name="Paul_1997_OD-A3"/><ref name="Paul_2004_YESCHAR"/> ;{{anchor|ZOMBIEDRV}} {{mono|1=ZOMBIEDRV}} {{nobold|(PTS-DOS only)}} : Configures deletion tracking.
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