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MEMORY
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1993-09-02
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MEMORY
Memory is not a straightforward computer feature. Normal memory, where
computer programs run, where the OS (operating system) and (many) device
drivers reside, is limited to 640K. The extra 2meg or 4 meg is used BY
certain programs, which are running in conventional (640K) memory. They
have special features which can load large blocks of data into that HI
(extended/expanded) memory. Then as the program works on the data, it
switches 'pages' of memory (16K blocks) from HI memory into conventional
memory while it works on that section of data. When that section isn't
needed it swaps that back into HI, and gets another peice to work on. This
lets you have HUGE spreadsheets or databases running yet only have 640K to
run the program(s).
The more programs (& TSRs and device drivers) you load, the less room
there is in conventional memory to operate. Somewhere along the line the
system will lock or crash if you keep adding TSRs & programs into 640K.
Don Hinds - Zoom Tech
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