I'm the first, I'm the first

Anyway, hello everyone,
I have about 20 Alteon 2424 application switches, but am trying tio find out what the latest code is for them. Currently the majority I have are running 23.0.3.4.
Am I right that Nortel don't do these anymore. I can't find anything on their site. Any advice would be greatly appreciated.
Regards
Stu