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1/20 Disk Boot

1/20 Disk Boot. MIS-B200-01 Spring 99. Agenda for 1/20. roll call discussion of disk boot discuss topics for group projects discuss plans for Friday, 1/22/99 progress report. From the CD-ROM: Tour the Disk Boot Process. Disk Boot, step 1: check the floppy.

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1/20 Disk Boot

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  1. 1/20 Disk Boot MIS-B200-01 Spring 99

  2. Agenda for 1/20 • roll call • discussion of disk boot • discuss topics for group projects • discuss plans for Friday, 1/22/99 • progress report

  3. From the CD-ROM: Tour the Disk Boot Process

  4. Disk Boot, step 1: check the floppy Step 1: The ROM BIOS checks the floppy drive for a diskette with system files. These system files are called MSDOS.SYS & IO.SYS. ?

  5. step 1A: check the hard drive Step 1A: If no system files are found on the diskette, the hard drive is searched for the files. MSDOS.SYS? IO.SYS?

  6. step 2: load the Boot Record Step 2: The boot record is copied to the RAM address 7C00. The ROM BIOS gives control of the startup to this program.

  7. Disk Boot, step 3: load the IO.SYS Step 3: the Boot Program copies the IO.SYS file into the RAM. The Boot Record now gives control to the IO.SYS.

  8. step 3A: Inside IO.SYS Step 3A: Part of IO.SYS is SYSINIT, which leads the rest of the boot-up process.

  9. step 4: SYSINIT takes over Step 4: SYSINIT loads MSDOS.SYS into RAM, which helps the ROM BIOS to run the computer.

  10. step 5: SYSINIT bosses MSDOS.SYS Step 5: SYSINIT tells MSDOS.SYS to follow CONFIG.SYS’s instructions and specifications.

  11. step 6: SYSINIT continues. Step 6: SYSINIT tells MSDOS.SYS to load COMMAND.COM which has 3 parts. The first becomes part of the operating system (OS).

  12. step 7: COMMAND.COM cont. Step 7: The second part of COMMAND.COM details the DOS commands. This stays in RAM. C:/ DIR = list contents C:/ RUN = run a program C:/ CD = change drive

  13. step 8: COMMAND.COM finishes Step 8: COMMAND.COM initializes an AUTOEXEC.BAT, which starts up various programs that the user has specified.

  14. Disk Boot, finished. The computer is now fully booted up.

  15. Group Topics:

  16. For 1/22: Read ch. 3: How an operating system controls hardware Last: Progress Report

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