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The applets in this chapter demonstrate a simple 8-bit microprocessor, called PRIMA, built from the Hades register-transfer-level simulation components. The processor is used as a first example of the von-Neumann architecture in our introductory lectures on computer architecture.

As its name implies, the primitive machine is a minimal accumulator machine with just four registers (accumulator, program counter, instruction register, address register) and a main-memory of 256x8 bits. The instruction set and encoding is so simple that the control unit (stw for "steuerwerk" in German) consists of just four flipflops and a few gates.

 spacer  PRIMA processor (primitive machine) applet  webstart  print 
 spacer  PRIMA sequencer applet  webstart  print 
 spacer  PRIMA Steuerwerk (control unit) applet  webstart  print 
 spacer  PRIMA processor (increment/decrement loop) applet  webstart  print 
 spacer  PRIMA processor (factorial calculation) applet  webstart  print 
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Impressum http://tams-www.informatik.uni-hamburg.de/applets/hades/webdemos/50-rtlib/90-prima/prima.html