Assembly Language Programming Organization of the IBM PC by Ytha Yu, Charles Marut

By Ytha Yu, Charles Marut

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Extra resources for Assembly Language Programming Organization of the IBM PC

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Cll memory word. gcts around this problem by partitioning its memory· in' to segments. · Memory Segment ·. kmcmory sagmcnt is a block of 2 16 (or 64 l

COM. -and reading user commands. •eommands; .. internal and external... · Infernal commands are performed by DOS routines that have been . loaded into'memory, external commands may rder to DOS routines that have not been loaded or {O application programs. In normal operations, many DOS routines are not loaded into memory so as to ~ave memory space. lecause DOS routines reside on disk, a program mu~l ue operating when the computer is powered up to read the disk. In Chapter 1 we mentioned that there are system routines stored in HOM that are not destroyed when the power ls off.

Each memory byte has an address, starting with 0. The 8086 processor assigns a 20-bit physical address to its memory locations. Thus it ls possible to address 220 .. 1,048,576 bytes (one megabyte) of memory. The first five bytes in memory have the following addresses: , . , 1 r1,rl•1l 1 ll1lfr1 0000000000000000 00000000000000001 00000000000000000010 00000000000000000011 00000000000000000100 Because addresses arc so cumbersome to write in binary, we usually express them as five hex digit~. thus 00000 00001 00002 00009 ·- OOOOA · OOOOB and so on.

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