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booting questions

charleswong
charleswong asked
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Medium Priority
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Last Modified: 2012-06-27
Cold boot initializes everything because power is off. While warm boot does not check RAM. But, does it reset any content of RAM? Does it reset the vector tables? If so, is it reseted by BIOS or DOS or both?

In addition, I was told that INT 19h can do warm boot as well. If it is true, does it reset any content in RAM?

By the way, I've tried to write a reboot program (assembly) by using INT19h. But it did not work. The PC hung up. Any trick for using INT19h?
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Top Expert 2007
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Top Expert 2007

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Here is INT 18H for your reference:

INT 18h (24)             BASIC Loader Service

    Activates Cassette BASIC.
_______________________________________________________________

       Notes:      This service transfers control to F600:0, which is
                      the location in ROM of the standard BASIC
                      interpreter. This interrupt works only on IBM
                      computers. Compatibles do not have BASIC in ROM but
                      must instead run a disk-based version of BASIC,
                      usually known as GW-BASIC.

                      This interrupt is executed if the Power-On Self Test
                      (POST) is unable to read the operating system off a
                      floppy or fixed disk.
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Top Expert 2007

Commented:
All three of us, myself, gtkfreak, dimitry, have provided information that answered the question. I believe that the points should be split three ways. Thanks :)
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