In case it helps all of the following are based on the SOC chip:
	MicroVAX 3100-30/40 (KA45)
	VAX 4000 Model 200 (KA660)
	VAXstation 4000 VLC (KA48)

You probably cannot tell them apart by looking at the SID since that is
implemented on-chip; you will need to look at SYS_TYPE (aka XSID)

Antonio