Int 19h

Toshiba / 1905-s301
March 27, 2010 at 10:47:56
Specs: Windows XP Home
I have a dead laptop...I have replaced everything: motherboard, CPU, Hard drive...I bought a PC Diag. board to put into the PCI slot and the code I got is OO which translates to "Going to give control to INT 19H Boot Loader". What is this and how can I fix it? There is nothing on the screen...I have stripped it down to bare keyboard no monitor...and always the same result...fires up for a few turns on...then shuts down...leaving the lights on and I have to kill it by holding the power key down...Throwing this damn thing in the garbage is not an option...I have other computers...I'm am going to fix this thing or go postal doing it!

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March 27, 2010 at 11:45:58
Int 19H is the last action performed by the BIOS before handing control over to the Operating System.

INt19H is a software interrupt that putss address 0019H onto the address bus and starts executing code found there. The code will have been put there by the BIOS. This code usually is just a jump instruction which jumps to a place in the BIOS where the code is.

Int19H loads the data found a Head 0, Track 0, Sector 1 which is at the very beginning of the disk. On a hard disk this will be the Master Boot Record. This loads the bit of code found there and executes it which then proceeds to load the lest of the Operating System. If Int19 executes correctly but cannot find find a hard or floppy disk to load from it comes beack with No Operating system Error.

As you are not getting such an error it suggests to me that Int 19 is not getting executed which means it is either a motherboard failure or a memory failure.


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March 27, 2010 at 14:10:35
Thank you stuart! As I have already replaced the motherboard, i will try getting new memory...I have already tried removing the two banks of memory individually and swapping them from bank to bank with no luck. What are the odds that both memory banks would fail at the same time or individually and not be noticed?

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