OpenManage with SC1420 ???

I just inherited administration of an existing network that uses several SC1420 servers. I'm attempting to get OpenManage to work with them, but there appears to be no version of OpenManage Server Administrator that works with these servers. The Server Assistant CD that came with them has nothing to link into OpenManager, either. I've checked other postings, but the most recent time this appears to have come up is last year. I have an OpenManage subscription with one of my other servers (a 2850), but have yet to receive any updates, so I can't check that. Is there any way to manage the 1420 servers with OpenManage Server Administrator?