Integrid is similiar to a "Works" program for the Grid 15xx and
includes a spead-sheet, word processor, disk manager, etc. I don't
know if it will work without the Grid version of  DOS 3.2.1

 Unzip the programs.zip to disk and place the unzipped files in a
"programs" folder. Then unzip the grid.zip to the same disk. The
grid.exe installation file will find the necessary files in the "programs"
folder to install Integrid.