旧機種のN0503も入手しました。「3.5インチのディスクが3台」または「2.5インチのディスクが5台」も内蔵できます。
これも、CPUがAtomとのことなので普通のPCかと思いきや、VGA出力がない。
PCIスロット（Expressではない）が1つあるので、そこにビデオカードを挿して（あとはUSBキーボード等を繋いで）やると、普通のPCになるようです。手元になぜか未開封（1996年モノ）のMatrox Mystique (PCI) があったので、開封して挿してみたところ動きました。
N0503のマニュアル類に、PCIスロットについての説明がほとんどないですが、背面のフタ（ネジ4本）を外し、その中の外周のネジ8本を外し、前面フタを開けた中の黒いネジ4本（2.5インチ用のケージは外さないと見えない）を外せば、中身が背面から引き抜けます。
N2800と比べた場合、前述の通りディスクが多く積めて良い面もあるものの、旧機種なのでCPUが旧型だったりメモリや内蔵フラッシュが小さいです。CPUはAtom N270なので、64bit非対応。メモリ1GBでフラッシュは128MB。測ってないですが、省電力仕様ではあるかもしれません。
OSを入れ替えたりする用途にはオススメしませんが、一応やればできるということで。
wd1はそのへんにあったSSDです。
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
2006, 2007, 2008, 2009, 2010, 2011, 2012
The NetBSD Foundation, Inc. All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
The Regents of the University of California. All rights reserved.
NetBSD 6.0_RC2 (GENERIC)
total memory = 1014 MB
avail memory = 984 MB
timecounter: Timecounters tick every 10.000 msec
timecounter: Timecounter "i8254" frequency 1193182 Hz quality 100
PhoenixAward 945GSE (6.0)
mainbus0 (root)
cpu0 at mainbus0 apid 0: Intel(R) Atom(TM) CPU N270 @ 1.60GHz, id 0x106c2
cpu1 at mainbus0 apid 1: Intel(R) Atom(TM) CPU N270 @ 1.60GHz, id 0x106c2
ioapic0 at mainbus0 apid 2: pa 0xfec00000, version 20, 24 pins
acpi0 at mainbus0: Intel ACPICA 20110623
acpi0: X/RSDT: OemId <IntelR,AWRDACPI,42302e31>, AslId <AWRD,00000000>
acpi0: SCI interrupting at int 9
timecounter: Timecounter "ACPI-Fast" frequency 3579545 Hz quality 1000
acpibut0 at acpi0 (PWRB, PNP0C0C): ACPI Power Button
SYSR (PNP0C02) at acpi0 not configured
attimer1 at acpi0 (TMR, PNP0100): io 0x40-0x43 irq 0
pcppi1 at acpi0 (SPKR, PNP0800): io 0x61
midi0 at pcppi1: PC speaker
sysbeep0 at pcppi1
npx1 at acpi0 (COPR, PNP0C04): io 0xf0-0xff irq 13
npx1: reported by CPUID; using exception 16
UAR1 (PNP0501) at acpi0 not configured
UAR2 (PNP0501) at acpi0 not configured
LPT1 (PNP0400) at acpi0 not configured
PMIO (PNP0C02) at acpi0 not configured
FWH (INT0800) at acpi0 not configured
EXPL (PNP0C02) at acpi0 not configured
MEM (PNP0C01) at acpi0 not configured
acpifan0 at acpi0 (FAN, PNP0C0B): ACPI Fan
acpitz0 at acpi0 (THRM): cpu0
acpitz0: active cooling level 0: 70.0C
acpitz0: levels: critical 70.0 C, passive 70.0 C
apm0 at acpi0: Power Management spec V1.2
attimer1: attached to pcppi1
pci0 at mainbus0 bus 0: configuration mode 1
pci0: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
pchb0 at pci0 dev 0 function 0: vendor 0x8086 product 0x27ac (rev. 0x03)
agp0 at pchb0: can't find internal VGA device config space
vendor 0x8086 product 0x27ae (miscellaneous display, revision 0x03) at pci0 dev 2 function 0 not configured
vendor 0x8086 product 0x27a6 (miscellaneous display, revision 0x03) at pci0 dev 2 function 1 not configured
ppb0 at pci0 dev 28 function 0: vendor 0x8086 product 0x27d0 (rev. 0x02)
ppb0: PCI Express 1.0 <Root Port of PCI-E Root Complex>
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled, rd/line, wr/inv ok
siisata0 at pci1 dev 0 function 0: vendor 0x1095 product 0x3132 (rev. 0x01)
siisata0: interrupting at ioapic0 pin 16
siisata0: SiI3132, 3.0Gb/s
atabus0 at siisata0 channel 0
atabus1 at siisata0 channel 1
ppb1 at pci0 dev 28 function 1: vendor 0x8086 product 0x27d2 (rev. 0x02)
ppb1: PCI Express 1.0 <Root Port of PCI-E Root Complex>
pci2 at ppb1 bus 2
pci2: i/o space, memory space enabled, rd/line, wr/inv ok
siisata1 at pci2 dev 0 function 0: vendor 0x1095 product 0x3132 (rev. 0x01)
siisata1: interrupting at ioapic0 pin 17
siisata1: SiI3132, 3.0Gb/s
atabus2 at siisata1 channel 0
atabus3 at siisata1 channel 1
ppb2 at pci0 dev 28 function 2: vendor 0x8086 product 0x27d4 (rev. 0x02)
ppb2: PCI Express 1.0 <Root Port of PCI-E Root Complex>
pci3 at ppb2 bus 3
pci3: i/o space, memory space enabled, rd/line, wr/inv ok
wm0 at pci3 dev 0 function 0: Intel i82574L (rev. 0x00)
wm0: interrupting at ioapic0 pin 18
wm0: PCI-Express bus
wm0: 256 word (8 address bits) SPI EEPROM
wm0: Ethernet address 00:14:fd:14:96:10
ukphy0 at wm0 phy 1: OUI 0x000ac2, model 0x000b, rev. 1
ukphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto
ppb3 at pci0 dev 28 function 3: vendor 0x8086 product 0x27d6 (rev. 0x02)
ppb3: PCI Express 1.0 <Root Port of PCI-E Root Complex>
pci4 at ppb3 bus 4
pci4: i/o space, memory space enabled, rd/line, wr/inv ok
wm1 at pci4 dev 0 function 0: Intel i82574L (rev. 0x00)
wm1: interrupting at ioapic0 pin 19
wm1: PCI-Express bus
wm1: 256 word (8 address bits) SPI EEPROM
wm1: Ethernet address 00:14:fd:14:96:11
ukphy1 at wm1 phy 1: OUI 0x000ac2, model 0x000b, rev. 1
ukphy1: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto
uhci0 at pci0 dev 29 function 0: vendor 0x8086 product 0x27c8 (rev. 0x02)
uhci0: interrupting at ioapic0 pin 23
usb0 at uhci0: USB revision 1.0
uhci1 at pci0 dev 29 function 1: vendor 0x8086 product 0x27c9 (rev. 0x02)
uhci1: interrupting at ioapic0 pin 19
usb1 at uhci1: USB revision 1.0
uhci2 at pci0 dev 29 function 2: vendor 0x8086 product 0x27ca (rev. 0x02)
uhci2: interrupting at ioapic0 pin 18
usb2 at uhci2: USB revision 1.0
uhci3 at pci0 dev 29 function 3: vendor 0x8086 product 0x27cb (rev. 0x02)
uhci3: interrupting at ioapic0 pin 16
usb3 at uhci3: USB revision 1.0
ehci0 at pci0 dev 29 function 7: vendor 0x8086 product 0x27cc (rev. 0x02)
ehci0: interrupting at ioapic0 pin 23
ehci0: EHCI version 1.0
ehci0: companion controllers, 2 ports each: uhci0 uhci1 uhci2 uhci3
usb4 at ehci0: USB revision 2.0
ppb4 at pci0 dev 30 function 0: vendor 0x8086 product 0x2448 (rev. 0xe2)
pci5 at ppb4 bus 5
pci5: i/o space, memory space enabled
vga1 at pci5 dev 12 function 0: vendor 0x102b product 0x051a (rev. 0x02)
wsdisplay0 at vga1 kbdmux 1: console (80x25, vt100 emulation)
wsmux1: connecting to wsdisplay0
drm at vga1 not configured
ichlpcib0 at pci0 dev 31 function 0: vendor 0x8086 product 0x27b9 (rev. 0x02)
timecounter: Timecounter "ichlpcib0" frequency 3579545 Hz quality 1000
ichlpcib0: 24-bit timer
ichlpcib0: TCO (watchdog) timer configured.
gpio0 at ichlpcib0: 64 pins
piixide0 at pci0 dev 31 function 1: Intel 82801GB/GR IDE Controller (ICH7) (rev. 0x02)
piixide0: bus-master DMA support present
piixide0: primary channel configured to compatibility mode
piixide0: primary channel interrupting at ioapic0 pin 14
atabus4 at piixide0 channel 0
piixide0: secondary channel configured to compatibility mode
piixide0: secondary channel ignored (disabled)
ahcisata0 at pci0 dev 31 function 2: vendor 0x8086 product 0x27c5 (rev. 0x02)
ahcisata0: interrupting at ioapic0 pin 19
ahcisata0: AHCI revision 1.10, 4 ports, 32 slots, CAP 0xc310ff03<PSC,SSC,PMD,ISS=0x1=Gen1,SCLO,SAL,SNCQ,S64A>
atabus5 at ahcisata0 channel 0
atabus6 at ahcisata0 channel 2
ichsmb0 at pci0 dev 31 function 3: vendor 0x8086 product 0x27da (rev. 0x02)
ichsmb0: interrupting at ioapic0 pin 19
iic0 at ichsmb0: I2C bus
isa0 at ichlpcib0
lpt0 at isa0 port 0x378-0x37b irq 7
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
pckbc0 at isa0 port 0x60-0x64
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
acpicpu0 at cpu0: ACPI CPU
acpicpu0: C1: HLT, lat 0 us, pow 0 mW
coretemp0 at cpu0: thermal sensor, 1 C resolution
acpicpu1 at cpu1: ACPI CPU
timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
uhub0 at usb0: vendor 0x8086 UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhub1 at usb1: vendor 0x8086 UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
uhub2 at usb2: vendor 0x8086 UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
uhub3 at usb3: vendor 0x8086 UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub3: 2 ports with 2 removable, self powered
uhub4 at usb4: vendor 0x8086 EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub4: 8 ports with 8 removable, self powered
ahcisata0 port 0: device present, speed: 1.5Gb/s
wd0 at atabus4 drive 0
wd0: <AFAYA MDM 128M>
wd0: drive supports 1-sector PIO transfers, LBA addressing
wd0: 122 MB, 978 cyl, 8 head, 32 sec, 512 bytes/sect x 250368 sectors
wd0: 32-bit data port
wd0: drive supports PIO mode 4
wd0(piixide0:0:0): using PIO mode 4
wd1 at atabus5 drive 0
wd1: <INTEL SSDSA2M080G2GC>
wd1: drive supports 16-sector PIO transfers, LBA48 addressing
wd1: 76319 MB, 155061 cyl, 16 head, 63 sec, 512 bytes/sect x 156301488 sectors
wd1: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
wd1(ahcisata0:0:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133) (using DMA)
umass0 at uhub4 port 7 configuration 1 interface 0
umass0: BUFFALO BUFFALO Optical, rev 2.00/1.08, addr 2
umass0: using ATAPI over Bulk-Only
atapibus0 at umass0: 2 targets
cd0 at atapibus0 drive 0: <PLDS, DVD A DH24AYS, BB2Y> cdrom removable
Kernelized RAIDframe activated
boot device: wd1
root on wd1a dumps on wd1b
root file system type: ffs
uhidev0 at uhub1 port 1 configuration 1 interface 0
uhidev0: Dell Dell USB Entry Keyboard, rev 2.00/5.02, addr 2, iclass 3/1
ukbd0 at uhidev0
wskbd1 at ukbd0 mux 1
wskbd1: connecting to wsdisplay0
wsdisplay0: screen 1 added (80x25, vt100 emulation)
wsdisplay0: screen 2 added (80x25, vt100 emulation)
wsdisplay0: screen 3 added (80x25, vt100 emulation)
wsdisplay0: screen 4 added (80x25, vt100 emulation)