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Chip Evolution

Discussion in 'BIOS Works' started by Admin, Jul 14, 2016.

Chip Evolution 5 5 1votes
5/5, 1 vote

  1. Admin

    Admin Administrator
    Staff Member

    Jun 22, 2016
    Likes Received:
    Chip Evolution
    - EPROM-Erasable Programmable ROM, used ultra-violet light (sunlight) to erase.
    - EEPROM-Electrically Erasable-what we use today.
    -Flash ROM-another name for EEPROM.
    - NVRAM-Non-volatile RAM. Really not so, still needs battery power.

    The Three-In-One
    - We have BIOS that stores code and access program to CMOS.
    - We have CMOS that stores changeable information about our system
    - We have RTC (Real Time Clock) that keeps track of date and time.
    All three are now rolled into one chip.

    About that Battery
    - Should last 5 to 10 yeard.
    - You can find them at Savon even.
    - If your system forgets date and/or time, it's time to replace the battery.
    Beware the evil ESD!

    More Battery
    - Sometimes we WANT to reset CMOS.
    + A forgotten password
    + Too aggressive overlocking
    + Incorrect low-level settings on some screen
    - Either move the jumper, or pull the battery.
    - Do either for about 10 seconds
    - If you are to pull battery, make sure you unplug system too.

    - Option ROM-put a BIOS chip on the card/device
    + Video is most common for this
    + SCSI cards
    + Network cards have socket, chip is extra.

    Software Solutions
    - Device Drivers-very flexible, but must wait until OS starts loading.
    - CONFIG.SYS-DOS utility program, runs before DOS really gets going.
    - SYSTEM.INI-Introduced with win 1 to 3, another text file. Win 9x won't boot without it; XP will.
    - The Registry-Introduced with Win 95. Binary database of information.

    Software Help
    - Control Panel-Graphical "window" to the Registry, Device manager-Another graphical path to the Registry, REGISTRY EDITOR (s):
    + REGEDT32

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