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  Computer Organization & Computer Organization &  Assembly Languages  Assembly Languages  Pu-Jen Cheng   MS-DOS & BIOS-level Programming   Adapted from the slides prepared by Kip Irvinefor the book,  Assembly Language for Intel-Based Computers, 5th Ed  Chapter Overview  MS-DOS and the IBM-PC  MS-DOS Function Calls (INT 21h)  -  MS-DOS and the IBM-PC  Real-Address Mode  MS-DOS Memory Organization  MS-DOS Memory Map  Redirecting Input-Output  Software Interrupts  INT Instruction  Interrupt Vectoring Process  Common Interrupts  Real-Address Mode  Real-address mode (16-bit mode) programs have the following characteristics:  Max 1 megabyte addressable RAM  Sinle taskin  No memory boundary protection  Offsets are 16 bits  IBM PC-DOS: first Real-address OS for IBM-PC  Has roots in Gary Kildall's highly successful Digital Research CP/M  Later renamed to MS-DOS, owned by Microsoft
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