Thanks to Mike Kölling, LAN is supported with this Laptop as well!
Regarding your questions:
- with USB: in the Lenovo BIOS one have to Disable USB 3.0 support, then those are used as 2.0 Ports (but, as noticed, this is for Lenovo only available upt to the ..50 series (X250,T450,W550) but not for the brand new ..60 series!! (Same as with the possibilitiy to disable UEFI!!)
- I have 1536 MB as virtual Memory in config.sys. In fact I am using the QSINIT Loader to build a 8GB RAM DISK with the unused RAM above 4 GB