As an electrical engineering student I designed and build my own processor (in VHDL), and wrote a simple assembler for it, it's not that difficult, just tedious

As an electrical engineering student I designed and build my own processor (in VHDL), and wrote a simple assembler for it, it's not that difficult, just tedious. Eventually I added a VGA frame buffer, PS/2 keyboard module and RS-232 support and made it work as a terminal. By connecting 2 of these 'computers' with a null-modem cable, we would have a little chat-box application to display during open days at my university. Ironically, I was once rejected for a programming job because I studied electronics, not computers. So clearly I didn't know how computers worked.