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Outport 0x20 - PowerPoint PPT Presentation

40:17H

#include <dos.h> void interrupt(*old)(); void interrupt newint9(); void main() { old = getvect(0x09); setvect(0x09,newint9); keep(0,1000); } void interrupt newint9() { if (inportb(0x60)==0x1F) { outportb(0x20,0x20); return; } (*old)(); }.

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439 views • 28 slides

System Programming

NFC-IET-2011. System Programming. Lecture-08 Interrupt Mechanism-Microprocessor Signals Dated: April 11, 2011 By Somia Razzaq Note: Some slides and images of following lecture are taken from VU. Keyboard Buffer. Keyboard Buffer is located in BIOS Data Area. Starts at 40: IEH

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369 views • 25 slides

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Outport 0x20 - PowerPoint PPT Presentation

40:17H

System Programming