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scmp

scmp


  2  definitions  found 
 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [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) 
 
 
 
  From  V.E.R.A.  --  Virtual  Entity  of  Relevant  Acronyms  13  March  2001  [vera]: 
 
  SCMP 
  Stream  Control  Message  Protocol  (ST2)