We attempt to compile and run a simple FORTRAN program on our vintage 1959 IBM mainframe computer at the Computer History Museum. FORTRAN is a big stretch for this business oriented machine, with 16k memory and a CPU not meant at all for scientific applications. Even integer multiply and divide instructions are an optional feature on the base machine! Success not guaranteed. Come see the IBM 1401 computer at the Computer History Museum in Mountain View, California, USA: https://computerhistory.org/exhibits/ibm1401/ Simulation and programming environment available here: https://github.com/lucaseverini/ROPE. Mike Albaugh has made a page that explains how to run the same demonstration in the SIMH simulation: http://nulli.us/f1401/package.html Some pointers on how to start programming the IBM 1401 on my website (work in progress): https://www.curiousmarc.com/computing/ibm-1401-mainframe/ibm-1401-programming Details on this implementation of FORTRAN: http://ibm-1401.info/1401-IBM-Systems-Journal-FORTRAN.html IBM 1401 FORTRAN compiler source code: http://ibm-1401.info/1401-FORTRAN-Illustrated.html E-mail exchanges with the original developers of the IBM 1401 FORTRAN: http://ibm-1401.info/FORTRAN-e-mails.html Official CHM IBM 1401 Video: https://www.youtube.com/watch?v=ZPpV8X91neQ More CuriousMarc IBM 1401 videos: https://www.youtube.com/watch?v=7Lh4CMz_Z6M Our sponsor for PCBs: https://www.pcbway.com/ Support the team on Patreon: https://www.patreon.com/curiousmarc Merch on Teespring: https://teespring.com/stores/curiousmarcs-store Learn more on companion site: https://www.curiousmarc.com/ Contact info: null