TECH.MOF contains 96 characters, the ASCII codes 33 (21h) to 128 (80h). These character have a constant height of 16 and are 0 to 16 pixels wide. Each character is encoded as 16 WORDs, from top to bottom. Each of those has one bit set if the corresponding pixel is set. The least significant bit corresponds to the left-most pixel. The width of each character is defined by the right-most pixel. That's why the space character can't be encoded in this format and is handled separately.

The characters 64 and 125 to 128 differ from Standard ASCII:

                  Code  | ASCII | TECH.MOF
                 =======|=======|===================
                   64   | @     | not displayable
                  125   | }     | Left arrow
                  126   | ~     | Up arrow
                  127   | DEL   | Right arrow
                  128   | C,    | Down arrow