                            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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