MicroVAX 3100 Questions.

Today at auction I acquired a MicroVAX 3100 system. It's my first VAX hardware. I don't know a lot about it and thought I would ask here for help. I put up a picture of the system on some personal webspace. The page is: http://sasteven.multics.org/MicroVAX/MicroVAX3100.html The system is a low-profile box, with one opening in the front face with a 5-1/4" form factor tape drive presently installed. There are free connectors and space inside for a single narrow SCSI drive. The system has two mezzazine-mounted memory cards inside and appears to have 16 megs of RAM on the cards. The model plate on back (one of the pictures on the page I put up) reads: Model- DV031DTA-A - A01 S/N- KA324TJ182 Some questions: 1. I notice on the Web that there is quite a bit of info about MicroVAX 3100 systems. I also see that there are a variety of models. Is there an easy way to figure out which one I have? 2. Would it be possible and/or work to replace the tape drive with a SCSI CD-ROM reader? I don't have a source for tapes. 3. Is it worth putting VMS on this box? It looks like it could run NetBSD as well. I also have McKusik's BSD archive CD set that he sells. Is there a flavor of vintage UNIX that I could put on the system? 4. What is the console on this hardware? It has the three serial ports on RJ-type connectors, and from what I gather this is a TTY-only machine, no framebuffer, etc. 5. Is there a thorough hardware reference for this machine out there on the net that I should get? I looked on the HP/Compaq site, and it appears that they pay a small amount of homage to the system, but without much substancial info. A hardware reference manual in PDF would be great. Any and all info would be appreciated. If there's a good site that I should be pointed to (there seems to be tons and tons of info out there, which results in Google pulling up a huge mass of stuff to weed through) instead of answering these specific questions, a pointer to it would be appreciated. Thanks, Scott.