As can be seen, OpenBSD 4.3 does work on the Neostation 3000. In this case it has an additional Intel EtherExpress installed, only the standard RAM and is built using Flashdist - so there's a lot of functionality missing

OpenBSD 4.3 (GENERIC) #698: Wed Mar 12 11:07:05 MDT 2008
    deraadt@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC
cpu0: Cyrix MediaGXtm MMXtm Enhanced ("CyrixInstead" 586-class) 234 MHz
cpu0: FPU,TSC,MSR,CX8,CMOV,MMX
cpu0: TSC disabled
real mem  = 30478336 (29MB)
avail mem = 19828736 (18MB)
mainbus0 at root
bios0 at mainbus0: AT/286+ BIOS, date 01/28/00, BIOS32 rev. 0 @ 0xfb1b0, SMBIOS rev. 2.2 @ 0xf0800 (42 entries)
bios0: vendor Award Software International, Inc. version "4.51 PG" date 01/28/00
apm0 at bios0: Power Management spec V1.2
apm0: AC on, battery charge unknown
acpi at bios0 function 0x0 not configured
pcibios0 at bios0: rev 2.1 @ 0xf0000/0xb638
pcibios0: PCI IRQ Routing Table rev 1.0 @ 0xfdf60/80 (3 entries)
pcibios0: PCI Exclusive IRQs: 10 11 15
pcibios0: no compatible PCI ICU found: ICU vendor 0x1078 product 0x0100
pcibios0: Warning, unable to fix up PCI interrupt routing
pcibios0: PCI bus #0 is the last bus
bios0: ROM list: 0xc0000/0x8000 0xd8000/0x2000 0xda000/0x2000
cpu0 at mainbus0
pci0 at mainbus0 bus 0: configuration mode 1 (bios)
pchb0 at pci0 dev 0 function 0 "Cyrix GXm PCI" rev 0x00
fxp0 at pci0 dev 7 function 0 "Intel 8255x" rev 0x08, i82559: irq 11, address 00:d0:b7:6a:cb:89
inphy0 at fxp0 phy 1: i82555 10/100 PHY, rev. 4
rl0 at pci0 dev 15 function 0 "Realtek 8139" rev 0x10: irq 10, address 00:e0:c5:c9:6d:fd
rlphy0 at rl0 phy 0: RTL internal PHY
pcib0 at pci0 dev 18 function 0 "Cyrix Cx5530 South" rev 0x00
"Cyrix Cx5530 SMI" rev 0x00 at pci0 dev 18 function 1 not configured
pciide0 at pci0 dev 18 function 2 "Cyrix Cx5530 IDE" rev 0x00: no DMA, channel 0 wired to compatibility, channel 1 wired to compatibility
pciide0: channel 0 ignored (other hardware responding at addresses)
pciide0: channel 1 ignored (not responding; disabled or no drives?)
"Cyrix Cx5530 XpressAUDIO" rev 0x00 at pci0 dev 18 function 3 not configured
vga1 at pci0 dev 18 function 4 "Cyrix Cx5530 Video" rev 0x00
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
ohci0 at pci0 dev 19 function 0 "Compaq USB OpenHost" rev 0x06: irq 15, version 1.0, legacy support
isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
wdc0 at isa0 port 0x1f0/8 irq 14
wd0 at wdc0 channel 0 drive 0: <CF Card>
wd0: 1-sector PIO, LBA, 961MB, 1969632 sectors
wd0(wdc0:0:0): using BIOS timings
sb0 at isa0 port 0x220/24 irq 5 drq 1: dsp v4.12
midi0 at sb0: <SB MIDI UART>
audio0 at sb0
opl0 at sb0: model OPL3
midi1 at opl0: <SB Yamaha OPL3>
pcppi0 at isa0 port 0x61
midi2 at pcppi0: <PC speaker>
spkr0 at pcppi0
npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16
pccom0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
pccom0: console
pccom1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
usb0 at ohci0: USB revision 1.0
uhub0 at usb0 "Compaq OHCI root hub" rev 1.00/1.00 addr 1
biomask f3c5 netmask ffc5 ttymask ffc7
softraid0 at root
root on wd0a swap on wd0b dump on wd0b