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The BIOS INT 19h procedure then uses the IPL table priority in NVRAM to decide whether to call an entry containing a boot handler which will read the MBR of 00h (floppy disk BAID; the first device in the BCV table to register disk 00h), an entry containing a boot handler which will read the MBR of 80h (the hard drive BAID; the first device in ...
Many of these tools were originally designed to boot from a floppy disk drive. The Ultimate Boot CD made it possible to run them on a PC without a floppy drive. [5] UBCD can also run from USB for computers without an optical drive. [5] The UBCD website has relatively good documentation for using the UBCD, and a discussion forum. [6]
A modern PC is configured to attempt to boot from various devices in a certain order. If a computer is not booting from the device desired, such as the floppy drive, the user may have to enter the BIOS Setup function by pressing a special key when the computer is first turned on (such as Delete, F1, F2, F10 or F12), and then changing the boot order. [6]
Early BIOS versions did not have passwords or boot-device selection options. The BIOS was hard-coded to boot from the first floppy drive, or, if that failed, the first hard disk. Access control in early AT-class machines was by a physical keylock switch (which was not hard to defeat if the computer case could be opened).
Bochs (pronounced "box") is a portable IA-32 and x86-64 IBM PC compatible emulator and debugger mostly written in C++ and distributed as free software under the GNU Lesser General Public License. It supports emulation of the processor(s) (including protected mode ), memory, disks, display, Ethernet , BIOS and common hardware peripherals of PCs .
In fact, even for the Macintosh 512K to use the drive, it requires an additional file in the System Folder on a special startup disk which adds additional code into memory during startup. A startup routine also allows the Mac to check for the presence of a System file on the Hard Disk, switch over to it and eject the startup disk.
Mac OS 8.6 and later include the version number in the splash screen (for example, "Mac OS 9" in big black text). On early Macs without an internal hard drive, the computer boots up to a point where it needs to load the operating system from a floppy disk.
The simplest way to distinguish a New World ROM Mac is that it will have a factory built-in USB port. No Old World ROM Mac had a USB port as factory equipment; instead, they used ADB for keyboard and mouse, and mini-DIN-8 "modem" and "printer" serial ports for other peripherals. Also, New World ROM Macs generally do not have a built-in floppy ...