The Sun SPARCstation 2. More info about the SS2 from Obsolyte.com.
Mine is actually labeled Alfaskop S30 from Nokia Data.
type:
cpu: cpu0 at mainbus0: cache chip bug; trap page uncached: CY7C601 @ 40 MHz, TMS390C602A FPU
cpu0: 64K byte write-through, 32 bytes/line, hw flush: cache enabled
memory: 64 MB - all slots on mainboard filled
disk drive: sd0 at scsibus0 target 3 lun 0: <SEAGATE, ST1480, 5232> SCSI2 0/direct fixed
sd0: 411 MB, 1476 cyl, 9 head, 63 sec, 512 bytes/sect x 843284 sectors
optical drive: external scsi CD-ROM drive (the case has model 411 on the bottom), needs caddy - not tested
other drive: floppy - fdc0 at mainbus0 ioaddr 0xf7200000 ipl 11 softpri 4: chip 82072
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec
graphics: cgsix0 at sbus0 slot 2 offset 0x0 level 7: SUNW,501-1481, 1152 x 900, rev 1 (console)
cgsix0: attached to /dev/fb
sound: audioamd0 at mainbus0 ioaddr 0xf7201000 ipl 13 softpri 4
audio0 at audioamd0: full duplex
network: le0 at sbus0 slot 0 offset 0xc00000 level 5: address 08:00:20:0e:c1:62
le0: 8 receive buffers, 2 transmit buffers

More info: FreeBSD, NetBSD, OpenBSD,

Work log:
2009-06-16: the machine only have an AUI connector, and needs a transceiver. Luckily I had one. Media support looks like this:
root@sparc2# ifconfig -m le0
le0: flags=8863<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        address: 08:00:20:0e:c1:62
        media: Ethernet 10base5
        status: active
        supported Ethernet media:
                media 10base5
2009-06-16: I booted this old workstation.OpenBoot says:
SPARCstation 2, Type 4 Keyboard
ROM Rev. 2.2, 64 MB memory installed, Serial #967010.
Ethernet address 08:00:20:0e:c1:62, Host ID 550ec162.
Note: this is after fixing the NVRAM / IDPROM, the battery is probably dead.