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### EDVAC (1944-49) John Mauchly/J.P Eckert/ John von Neumann Built at the Moore School for the BRL as a successor to ENIAC by Mauchly and -Eckert whilst ENIAC was still operational. It arose out of #vonNeumann -discussions with Mauchly and Eckert and was necessitated by the need to -calculate the behaviour of the fissile materials in the atomic bomb. +Eckert whilst ENIAC was still operational. It's architecture arose out of +discussions between #vonNeumann and Mauchly and Eckert and was necessitated by +the need to calculate the behaviour of the fissile materials in the atomic bomb. -It resulted in the famous _First Draft of a Report on the Edvac_ by #vonNeumann +It resulted in the famous _First Draft of a Report on the EDVAC_ by #vonNeumann which is seen as the definitive statement of the modern **digital programmable general-purpose computer**. @@ -331,4 +331,11 @@ the ABC to make ENIAC. // Add more on the hardware. +### Concept of the _internal stored program_ + +- Key innovation of the EDVAC was the _internal stored program_. +- Solution to the problem of preceding computers requiring down-time when + switching between applications and problem sets. + - Circuitry would need to be reconfigured before the c + ## Machines diff --git a/zk/Turing_completeness.md b/zk/Turing_completeness.md index 6179cec..e3b3b33 100644 --- a/zk/Turing_completeness.md +++ b/zk/Turing_completeness.md @@ -27,6 +27,11 @@ however the inverse doesn't hold: a non-TC system cannot emulate a TS system. For instance a calculator cannot do what a TC smart phone can do. But a smart phone can act as a calculator. +This concept of completeness is also expressed in terms of a Universal Turing +Machine - a TM capable of simulating any other Turing machine. Given that the +ability of a TM to simulate another TM is the condition for completeness, a TC +system is also a UTM. + Completeness applies to the hardware of computers as well as their software. Turing Completeness is the theoretical basis of the practical concept of a @@ -35,5 +40,3 @@ TC - it can in theory compute anything that is computable. Most modern programming languages are Turing Complete in that they can, in theory, be used to compute anything that is computable. - -What about Universal Turing Machines eh?