COMPUTATIONAL NODE SPECIFICATION SHEET                     

DESCRIPTION

The APOLLO DOMAIN is a high performance local area network
of dedicated computers operating a distributed environment.
Computational Nodes are connected together using a convent-
ional high bandwidth coaxial cable organized in a ring
topology.  The network is the mechanism that allows system
level hardware and software resources to be shared throughout
the DOMAIN system.

Each DOMAIN (Distributed Operating Multi-Access Interactive
Network) Computational Node, as it is sometimes called, has
its own dedicated 32-bit central processor, memory system,
high resolution bit-mapped display, winchester dispaly, and
network interface.  In addition, each node contains a floppy
disk, three asynchronous serial I/O ports, virtual memory
management hardware and a "soft" (i.e., programmable) key-
board with more than 200 user-definable keycode combinations.

FEATURES

o Dedicated 32 bit VLSI CPU in each DOMAIN Node
o Virtual memory management hardware to support a network-
  wide demand paging environment 
o High resolution (100 dot/inch) bit map raster display
o Separate and autonomous 1.0 megabit dual ported memory
  for display subsystem
o Ring network topology with dual address packet and single
  token arbitration
o Integral baseband network with a 12 megabit per second
  data rate
o Error checking and correcting MOS memory expandable to 3.5
  megabytes
o Mass storage options - 33, 66, and 300 megabyte disks

The above hardware block diagram illustrates the internal
organization of a Computational Node.

NETWORK INTERFACE

o 12 megabit per second data rate
o Continuously synchronizing ring topology
o Token passing-based arbitration mechanism
o Two address packet network with broadcast capability
o Self-synchronizable serial bit stream
o Conventional bit stuffing technique
o 1000 meters between active nodes
o Inactive nodes bypassed to maintain network continuity
o Network cable - standard 75 OHM coaxial (CATV)RG6/U (e.g.
  Belden 9248)

CPU/MEMORY MANAGEMENT UNIT

o Dual 32 bit VLSI processors
o 16 megabyte virtual process address space
o Multiple processes per workstation
o Converts 24 bit process virtual address to 22 bit physical
  address
o Maintains protection and statistical information on a per
  page basis
o Hardware to support a network-wide demand paging environment
o Page size is 1024 bytes

DISPLAY

o Raster scan, bit-mapped graphics display
o High resolution _ 10,000 (100 x 100) pixels per square inch
  (approx.)
o Autonomous 1 megabit dual ported display memory - separate
  from main memory
o Standard -  Portrait orientation, 1024 x 800 pixels (10.5"
  x 8.3"), black & white (P104) phosphor
o 60 Hz (interlaced) or 30 Hz (non-interfaced) refresh rate
o 32 megabit transfer rate within display memory using hard-
  ware bit block transfer
o 64 megabit transfer rate when doing rectangular fill
o Bit block transfer in parallel with screen refresh
o Bit block transfer between display and main memories

WINCHESTER DISK

o 33 or 66 megabyte capacity
o 1.0 megabyte per second DMA transfer rate
o Highly reliable 14" winchester disk technology
o 3000 RPM, non-removable media device
o Average latency 9.7 milliseconds
o Average seek 50 milliseconds
o 32 bit error correcting code with 1056 byte sectors

FLOPPY DISK

o 1.2 megabyte capacity
o 8 inch double-sided, double-density removable media
o 625 kilobyte per second DMA transfer rate
o Average latency 83 milliseconds
o Average seek 149 milliseconds

MEMORY

o 0.5 megabytes expandable to 3.5 megabytes
o Six bit error correcting code will detect and correct 100%
  of all single bit failures and detect 100% of all double
  bit failures
o Modular field upgradable increments of 0.5 and 1.0 megabytes
o Automatic error reporting of faulty memory

SERIAL I/O PORTS

o Three separate RS-232C ports
o Interfacing speed ranges from 50. through 19.2K baud
o Software support for X-ON/X-OFF
o Optional 60 character per second letter quality printer

KEYBOARD

o Microprocessor controlled with Hall effect keyboard
o Full ASCII compatibility
o Eight programmable function keys for each active process
o Optional touchpad locating device for fast and easy cursor
  positioning
o Selective repeat and auto repeat keys
o "N" key rollover with sculpted key caps
o Operates at 1200 baud
o Keyboard attached to display with 3 foot (1 meter) coiled
  cable

PHYSICAL DIMENSIONS

              Electronic     
              Enclosure      Display        Keyboard

Height        29.0(74)       17.2(44)        2.5 (6.3)
Width         23.2(59)       13.0(33)       21.5(54.6)
Depth         31.5(80)       14.0(35.5)      8.5(21.6)

*All Dimensions in inches(cm)

ENVIRONMENTAL SPECIFICATIONS

o Each node dissipates approximately 850 watts with a maximum
  of 1450 watts at start up
o The ambient temperature should remain within the range of
  60o F (15o C) to 90o F (32o C), with the optimal temperature
  being 68o F (20o C)
o The altitude of the installation site must be within the
  range of 0 to 7000 ft. (2.1 Km)
o Electrical requirements on a per node basis is 120 Vac+-
  10%, 15 Amps