HP 50g Matrix Writer

Selecting option "8.Matrix Writer.." in the [APPS] menu launches the matrix writer or Press [Left_Shift] [MTRW]:

To exit and save Matrix, press [ENTER] to exit to the command prompt.  The press [ENTER] again, to put the matrix into a "stack".  Press [STO] and [ALPHA] [A], to store matrix into the A variable.

To retrieve the Matrix from the "A" variable, type RCL(A) and press [ENTER].  Press {EDIT} Soft Key to launch Matrix Writer.