DARSIMCO was forgotten when the first FORTRAN compiler was installed on the machine in 1957. The arrival of FORTRAN instilled an important lesson. Kurtz, having been indoctrinated that FORTRAN was slow, spent several months writing a program in 704 assembler which had taken up about an hour of CPU time to debug and still wasn't running. Giving up, he rewrote it in FORTRAN and had it running in five minutes. The lesson was that high-level languages could save time, regardless of their measured performance.