Virus attacks

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Virus attacks
There was at least one virus which was able to erase Flash ROM BIOS content, rendering computer systems unusable.
CIH, also known as "Chernobyl Virus", affected systems BIOS and often they could not be fixed on their own since they were no longer able to boot at all.
- To repair this, Flash ROM IC had to be ejected from the motherboard to be reprogrammed somewhere esle. Damage from the CIH virus was possible sine most motherboard at the time of CIH propagation used the same chip set, Intal TX, and most common operating systems such as Windows 95 allowwed direct hardware access to all programs.

LOAD BOOT RECORD
Screen Shot 2016-07-07 at 11.05.21 PM.jpg
ROM BIOS STARTS POST
Screen Shot 2016-07-07 at 11.05.37 PM.jpg
FIND BOOT RECORD
Screen Shot 2016-07-07 at 11.05.29 PM.jpg
LOAD IO.SYS
Screen Shot 2016-07-07 at 11.05.10 PM.jpg
 
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