Download e-book for iPad: DOS Beyond 640K by Jim Forney

By Jim Forney

Holiday in the course of the 640K reminiscence barrier with inexpensive and software program improvements! How do you want with a view to hold better facts documents, create extra versatile paintings environments, and run extra robust courses in your workstation? good, you could! Now thoroughly revised to incorporate in-depth info at the newest choices and techniques on hand to RAM-restricted DOS clients, this 3rd version of DOS past 640K is the right consultant to breaking during the 640K reminiscence barrier. within, you can find info on a number of start-up configurations for well known working platforms, new prolonged and extended reminiscence ideas, enhanced reminiscence managers, DOS-extended purposes, genuine vs. secure mode reminiscence administration schemes and reminiscence necessities for significant software program applications.

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The bottom line is that, even if you're doing spread­ sheets, for instance, it is quite likely you will see no improvement at all. You will certainly see nothing to justify the investment that, in the case of something like one of the Weitek coprocessors for 386s, can run to $1000 or more. Not that there are not many applications that will benefit from the use of a coprocessor. Many will. There are even software packages, such as some releases of AutoCAD, that 30 At the heart ofthings will not even run unless you have one.

Dollar for dollar, a 386SX is, without a doubt, the best buy on the market today for most user applications and should continue to be for some time to come. 28 At the heart ofthings Power to go: the 386SL It is anticipated that by 1994 as much as 37 percent of a projected 40 million-unit PC market will be for laptops or the smaller notebook sizes. In the same time­ frame, 32-bit systems could account for more than half of all the portable machines. Looking to that market, Intel now has added the SL to its 386 line.

Unlike the 386, the address registers of the 286 cannot be remapped to allow tucking bits and bigger chunks of usable RAM into unused and otherwise unoccupied address spaces between 640K and DOS's 1 Mb top. The 286 also does not have the virtual machine multitasking capability inherent in the 386. Some users even go so far as to call the 286 a "brain dead" chip because of all the things it can't do. There is, however, a large installed user base of 286 machines out there that is getting bigger every day.

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DOS Beyond 640K by Jim Forney

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