Tops-20
So what is a TOPS-20? It's an OS that DEC (Digital Equipment Corporation) released in the mid-70s. My College had one around that time. The first real CS class at the time was in Pascal, which ran under TOPS-20. To be honest, I never saw the hardware it ran on, only the terminals we type code into.
One had to wait for their turn on a terminal, so it forced them to pre-write and prepare the code before entering it as a program. Sometimes I believe it helped to form good discipline and think of the problem before writing the program.
The image above is a DEC System20 that TOPS-20 could run on
About the author
Started in BASIC, went through Pascal, SQL , Assembly, C, C++, Objective C and C++. dbase, Foxpro, Clipper, JavaScript, TypeScript, Angular, React, AWS, NoSQL - and stuff, I didn't list , but the long and short is whatever it took to get the job done.
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