On Oct 17, 2000; Neil Cherry <ncherry(a)home.net> wrote: And then after some list discussion, he wrote: You mention the number PM20A-AB. That is the model number for a DECstation 3100. Given the assumption that is what you actually have, here is some info. The DS3100 will take up to 24mb of RAM using 2mb SIMMS, model no MS01-AA, part number 50-19464-02. AKAIK, that is the only memory module you can put in it. Just behind the memory is the video frame buffer. It is either a VFB02 mono, or a VFB02 color (p/n 54-19469-01). There is a mounting plate over top of the motherboard where you can mount RZ2x drives and an RX23 floppy depending on which mounting plate you have. For some other info on the DS3100 see: http://www.netbsd.org/Ports/pmax/models.html An excerpt from that site: Maximum of 24 MB RAM in 2 MB pairs (memory part number MS01-AA) 1024x864 framebuffer option module, either mono (with memory part number VFB01) or 8-bit color (with memory part number VFB02). Both provides 16x16 hardware sprite cursor SII SCSI-I controller with obscure external connector (HONDA68 male; wide SCSI-3-like, but other gender) AMD LANCE 10 Mbit Ethernet interface with switchable AUI and BNC connectors DC7085 four-port serial chip (DZ-11 clone) Two MMJ-6 serial ports, with maximum speed of 9600 baud. One port has partial modem control, the other has none. DIN-7 connector for mouse and MMJ-5 connector for keyboard. (An adaption-connector can make these ports usable as RS-232 serial ports with no modem control.) This is a SCSI expansion box for mounting RZ5x drives and various tape drives (TZ30, etc.). This box is generic enough that is usable on other DEC machines, as well as other brands. Are there any drives in the BA42, which by the way is aka SZ12 I have never heard of any other OS other than Ultrix, and according to the above URL NetBSD has been ported to it. Mike