The easiest way to get space for what you want to do is something like this
type
   PMatrixCol = ^TMatrixCol;
   TMatrixCol = array[1..100] of double;

   TMatrixRow = array[1..100] of PMatrixCol;

var Matrix: TMatrixRow;

{Picture Matrix as a vertical array of pointers with TMatrixCols extending
 to the right of the pointers...}

   {Allocate mem for the columns...}
   For i := 1 do 100 do Matrix[i] := new(PMatrixCol);

   {do something with element(Row,Col)..}
   Matrix[Row]^[Col] := SomeValue;

                I'm using an older version of Turbo Pascal compiler (V. 5.5)
and I'm running into some problems because I want to implement a very large
matrix of double precision floating reals.  And I need enough other stack
space to do all the other computations.  The first problem is that I cannot
create a large enough matrix (~100X100).  Anyone sucessfully solved this
problem?  Second, even if I could make this big a matrix, I'd probably run out
of space to do all the other things.  Would it be possible to put the routines
associated with this big matrix into a subprogram (i.e. separately compiled
unit) and call it from the main program?  Would this allow me to have the
storage I need in the main program while keeping a large matrix on the side?
Thanks in advance for your help.