Linux USB Computer
author Neil Franklin, last modification 2006.03.09

PC/x386 compatible or ARM based computer designed around USB peripherals
the ultimate legacy free pc


Main device only CPU + RAM + direct connected many-port USB adaptor
  either PCI Bridge with 2 external 5-port EHCI Chips
  or even direct 8|10-port USB bridge on North-South bridge connection
    in later case possbily abandon EHCI and go for full DMA ability

All other stuff added per USB adaptors:

- Keyboard, Mouse, Joystick, etc
  -> no PS/2 or DB15 ports
- video (like usb2vga) and sound output, mike, etc
  -> no PCI/AGP or even ISA slots
- all Disks (HD, Flash, Floppy, CD/DVD, camera)
  -> no floppy or IDE/SATA or SCSI connectors, nor internal drive space
- printers (or parallel or serial converter)
  -> no LPT/parallel or COM/RS232 ports
- Ethernet (or direct cable/ADSL modem)
  -> no Ethernet connector

-> no Slots, no drives -> small case and small power supply
   and no ports -> no ATX form factor, just small box
   cables only power in and many USB ports, some on front, some at back

BIOS Flash only knows about USB, sets up adaptor, uses USB keyboard and USB
video for console and USB storage for boot disks, rest via (few) drivers


Possibly extension for this also explicit USB "terminal"/console:

Is a monitor with speakers, with built in USB video and sound
  and monitor control, and an internal 8-port USB hub for above
  and ports for users key/mouse/joy/camera/USB-stick/removable-disk-drives

Only few cables: power in and single USB cable to system, and USB ports

In this case system box only needs 5|6 insted of 8|10 USB ports
  as only 1 port used for entire terminal, rest only for disks/printers/comms