My first computer was a BBC Model B (32K RAM, BASIC with an in-line assembler) ... this is in the UK, I doubt it was marketed much in other countries. I got an 'acoustic coupler' for it and signed up to a service called Micronet 800.

An acoustic coupler, for those too young to remember :P was the forerunner to a modem, basically a cradle in which you placed your telephone handset.

The coupler was 1200/75, i.e. 1200 baud downstream, 75!! baud upstream I think, and I also used it to play MUD at Essex University in the UK (written by Richard Bartle) via a hacked PSS (UK X25 network) account ... as far as I know, this was the first ever multi-user adventure game in the world.

Ahh, well, I am rambling .... good memories though

Edit: Graduated from the BBC to an ATARI 520STFM, then to an Amiga 500, and then sold-out to Intel with my first PC, a 486DX-33