Scmp definition

Scmp





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2 definitions found

From Virtual Entity of Relevant Acronyms (Version 1.9, June 2002) [vera]:

  SCMP
       Stream Control Message Protocol (ST2)
       
       

From The Free On-line Dictionary of Computing (27 SEP 03) [foldoc]:



  SC/MP
       
          (Nicknamed "Scamp") A typical 8-bit {microprocessor} from
          {National Semiconductor} released in April 1976.  It was
          intended for control applications (a simple {BASIC} in a 2.5K
          {ROM} was added to one version).  It featured 16 bit
          addressing, with 12 address lines and 4 lines borrowed from
          the data bus (it was common to borrow lines from the data bus
          for addressing).  Internally, it included three {index
          register}s (P1 to P3) and two 8-bit general-purpose
          {register}s.  It had a {PC}, but no {stack pointer} or
          {subroutine} instructions (though they could be emulated with
          index registers).  During {interrupt}s, the {PC} was saved in
          P3.  It was meant for embedded control, and these features
          were omitted for cost reasons.  It was also {bit serial}
          internally to keep it cheap.
       
          The unique feature was the ability to completely share a
          system bus with other processors.  Most processors of the time
          assumed they were the only ones accessing memory or I/O
          devices.  Multiple SC/MPs could be hooked up to the bus, as
          well as other intelligent devices, such as {DMA controller}s.
          A control line (ENOUT (Enable Out) to ENIN) could be chained
          along the processors to allow cooperative processing.  This
          was very advanced for the time, compared to other {CPU}s.
       
          In addition to I/O ports like the {Intel 8080}, the SC/MP also
          had instructions and one pin for serial input and one for
          output.
       
          (1994-11-16)
       
       

















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