July 2004
Intermediate to advanced
1744 pages
35h 3m
English
Content preview from The Unabridged Pentium 4 IA32 Processor GenealogyBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Problem—Running Two (or more) DOS Programs
Application programs designed for the DOS environment are written using 8088 code and only access information in the first 1MB of memory space (i.e., from 00000000h through 000FFFFFh). Furthermore, each DOS application believes itself to be the only program executing and, as long as it doesn't mangle the OS (which also resides in the first 1MB area), it can access any location within the first 1MB of memory space.
If a multitasking OS were to load two or more DOS application programs into the first 1MB of memory, the second one loaded would almost certainly overwrite a portion of the first one (thereby rendering it useless). Even if they occupied mutually-exclusive areas of the first 1MB (highly unlikely), ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.