I wrote a full VT/ANSI BBS client for the C64 using 6502 assembler and it was one of the fastest around. I never commercialised it, but it became something of a

I wrote a full VT/ANSI BBS client for the C64 using 6502 assembler and it was one of the fastest around. I never commercialised it, but it became something of an underground hit in the UK at the time. The software was noteworthy because it ran in graphics mode with its own set of fonts and also (just about) managed to juggle printing AND still handling the serial comms, which was made super-difficult by the way port interrupts and I/O were handled on the C64.