C Dos Run Sweatshirt Vintage 1980s Embroidery

C DOS Run Sweatshirt Vintage 1980s Embroidery Computer Geek Programmer Developer.  When I got this unique shirt at an estate clear out, it had no signs of use, but lots of stains where something had been splattered, as it had been poorly stored in a garage.  I was able to clean it up quite well, but two very faint stains remain on the outside of one sleeve, as shown in the last two pictures. There is some pilling of the fabric on those same two spots where I rubbed a lot.  Haven't found any other actual vintage shirts with this saying or with it embroidered. Please click through to zoomable images for details and measurements.