IRC is short for Internet Relay Chat. To access it you'd need a client to use it. mIRC could be an oppertunity. I use vIRC.
Emuchina is apparently another emulation site but very large. www.emuchina.net
has a lot for download, but have an IRC channel as well it seems.
TOSEC...well I can't quite remember, but I know my Amiga has problems with the way too long filenames when extracting zip files in the format there. http://tosec.retrogames.com
should give you some insight.