before I-cache

By: rwessel (robertwessel.delete@this.yahoo.com), February 22, 2020 12:13 pm
Room: Moderated Discussions
Mark Roulo (nothanks.delete@this.xxx.com) on February 21, 2020 4:03 pm wrote:
> Moritz (better.delete@this.not.tell) on February 21, 2020 3:46 pm wrote:
> > Mark Roulo (nothanks.delete@this.xxx.com) on February 21, 2020 11:57 am wrote:
> > > This sounds like you are asking when on-die I-caches appeared?
> >
> > This would have been a stepping stone to automatic I-caches while at the same time being similar to uCode.
> >
>
> There have been computers with writeable microcode.


Slightly on topic, a number of the heavily microcoded IBM mainframes of the 1970s, 80s and 90s, which all had rewritable control storage (microcode RAM), could also overflow microcode in a partitioned-off section of main memory. Thus little used microcode functions could be punted to much the much cheaper (and larger), if slower, main memory.
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TopicPosted ByDate
Has there ever been a CPU with ...Moritz2020/02/21 07:11 AM
  Has there ever been a CPU with ...hobold2020/02/21 07:33 AM
    Has there ever been a CPU with ...Adrian2020/02/21 09:10 AM
      Has there ever been a CPU with ...Lyra Heartstrings2020/02/21 01:45 PM
    locked i-cacheMoritz2020/02/21 09:32 AM
      locked i-cacheWilco2020/02/21 10:33 AM
    Has there ever been a CPU with ...blaine2020/02/21 12:39 PM
  Has there ever been a CPU with ...Gabriele Svelto2020/02/21 10:11 AM
    Atari Jaguarincorrector2020/02/22 05:40 AM
    Super-FX & THX, allMoritz2020/02/22 10:40 AM
  Has there ever been a CPU with ...Tim McCaffrey2020/02/21 10:41 AM
    Instruction BuffersRob Thorpe2020/02/22 07:37 PM
      Instruction BuffersMarcus2020/02/23 02:50 AM
        Instruction Buffers - Cray 1Björn R. Björnsson2020/02/23 09:40 AM
          Instruction Buffers - Cray 1Marcus2020/02/23 10:24 AM
            Instruction Buffers - Cray 1Björn R. Björnsson2020/02/23 11:25 AM
  Has there ever been a CPU with ...Mark Roulo2020/02/21 11:57 AM
    before I-cacheMoritz2020/02/21 03:46 PM
      before I-cacheMark Roulo2020/02/21 04:03 PM
        before I-cacherwessel2020/02/22 12:13 PM
          before I-cacheanonymou52020/02/22 02:49 PM
            microcode RAM capacity (before I-cache)hobold2020/02/23 02:33 AM
  Has there ever been a CPU with ...anonymous22020/02/21 12:21 PM
  Has there ever been a CPU with ...Jose2020/02/21 02:43 PM
  Has there ever been a CPU with ...Peter Greenhalgh2020/02/23 03:20 AM
  Has there ever been a CPU with ...gallier22020/02/24 12:28 AM
  Has there ever been a CPU with ...Etienne2020/02/24 05:25 AM
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