Yeah, I remember typing that into a TRS-80 Color Computer at the local Radio Shack. The computer responded with 'OK', if I recall correctly. WAT! No ?SN ERROR? Well, okay, then! Nothing else, either, tho. Hrmmmm...
Imagine my mystification when I would RUN a program, only to watch the screen fill up with [10][20][30]...
Yeeeeaaaah, still pretty near the bottom of the learning curve...