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[1] [3] Though NTLDR and boot.ini are no longer used to boot Windows Vista and later versions of Windows NT, they ship with the bootcfg utility regardless. This is to handle boot.ini in the case that a multi-boot configuration with previous versions of Windows exists and needs troubleshooting from within the later operating system.
In Windows 3.1, additional options are available, such as /3, which starts Windows in 386 enhanced mode, and /S, which starts Windows in standard mode [2] A startup sound was first added in Windows 3.0 after installing the Multimedia Extensions (MME), [3] but not enabled by default until Windows 3.1.
EasyBCD has a number of bootloader-related features that can be used to repair and configure the bootloader. From the "Manage Bootloader" section of EasyBCD, it is possible to switch between the BOOTMGR bootloader (used since Windows Vista) and the NTLDR bootloader (used by legacy versions of Windows, from Windows NT to Windows XP) in the MBR from within Windows by simply clicking a button.
bootcfg /ems on /port com1 /baud 9600 /id 1 On Windows Vista it is enabled by typing the following command where {default} is the OS entry in BCDedit: bcdedit /bootems {default} on In Windows Vista the serial port settings, Baud rate and Port ID, are accessed and modified using the following command:
On system with BIOS firmware, the BIOS invokes MBR boot code from a hard disk drive at startup. The MBR boot code and the VBR boot code are OS-specific. In Microsoft Windows, the MBR boot code tries to find an active partition (the MBR is only 512 bytes), then executes the VBR boot code of an active partition.
This behavior is also present in Windows 2.0 and Windows 2.1. Windows 3.0 uses a text-mode screen for displaying important system messages, usually from digital device drivers in 386 Enhanced Mode or other situations where a program could not run. Windows 3.1 changed the color of this screen from black
The default OperandSize and AddressSize to use for each instruction is given by the D bit of the segment descriptor of the current code segment - D=0 makes both 16-bit, D=1 makes both 32-bit. Additionally, they can be overridden on a per-instruction basis with two new instruction prefixes that were introduced in the 80386:
The upper nibble is ignored, and can either be zero, or the leading-nibble for the ASCII character (value 3). [2] BCD numbers are generally assumed to be stored in the lowest byte of a register, e.g. AL; operations on unpacked BCD numbers expect the least significant digit in the lowest byte of a register, e.g. AL, and the most significant ...