Technical Reference

Appendix F

F.1   SIRIUS 1 TECHNICAL SPECIFICATION

Processor
  • Intel 8088 16-bit microprocessor
  • 128k or 256k bytes standard (depending on model)
  • 335ns cycle time, 64k Dynamic RAM
  • 4 internal expansion slots for plug-in card options
  • 2 x RS232C serial communications ports. standard DB25-type connectors
  • 1 x Parallel (Centronics) or IEEE-488 port. 36 way amphenol connector
  • 2 x Parallel user port (50-way KK Connector on CPU board)
  • Expandable to 896K
  • 8k bytes of ROM (boot and diagnostic)
  • 4k bytes of screen RAM
Display System
  • 25 line x 80 column screen; 8 x 12 characters in a 10 x 16 cell
  • 50 line x 132 column screen
  • 300mm CRT, Green p39 phosphor
  • Adjustable horizontal viewing angle (+_ 45 degree swivel)
  • Adjustable vertical viewing angle (0 deg to +11 deg tilt)
Disc Drives
  • Standard 130cm, single-sided 96 TPI dual disc drives, with a maximum capacity of 600k bytes per drive.
  • Optional 130cm, double-sided 96 TPI dual disc drives, with a maximum capacity of 1200k bytes per drive.
  • Optional single 10,000k byte Hard Disc - non-removable; with single 130cm, double sided 96 TPI disc drive with a maximum capacity of 1200k bytes.

Single-sided floppy drive offers 80 tracks at 96 TPI
Double-sided floppy drive offers 160 tracks at 96 TPI Floppy drives have 512 byte sectors; utilising a GCR, 10-bit recording technique.

  • Floppy disc access times:
    • 2 micro-second per bit data transfer rate
    • Interleave factor of 3
    • Average seek time approx 94 milli-seconds
    • Track-to-track step time 3ms: Latency 100ms
  • Hard drive access times
    • 0.2 micro-second per bit data transfer rate
    • Interleave factor of 5
    • Average seek time approx 85 mili-seconds
    • Head settling time 15 ms: Latency 8.33ms
Keyboard
  • Separate Intel 8048 microprocessor
  • Fully software definable with 10 soft function keys
  • Full IBM Selectric II (56 key) keyboard layout
  • Type ahead buffering to 32 levels and full n-key rollover
  • Capacitive keyswitches rated for 100 million operations
  • Keyboard contains PCB with on-board drivers
Electrical
  • Input voltage 90-137 VAC or 190-270 VAC (internal jumper)
  • Input frequency 47-63 Hz
Environment
  • Operating temperature 0oC to 40oC
  • Operating humidity 20% to 80% (non-condensing)
  • Storage temperature -20oC to 70oC
  • Storage humidity 5% to 95% (non-condensing)

F.2 Sirius 1 Physical Specifications 
Mainframe Assembly

     Height         Width          Depth          Weight (approx)
     178 mm         422 mm         356 mm         12.6 kg

Display Assembly

     Height         Width          Depth          Weight (approx)
     264 mm         326 mm         339 mm         8.1 kg

Keyboard Assembly

     Height         Width          Depth          Weight (approx)
     45 mm          483 mm         203 mm         1.5 kg

System Assembly

     Height         Width          Depth          Weight (approx)
     457 mm         483 mm         559 mm         22.2 kg

Width without the keyboard module is 396mm.
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Last revision 22/01/2003