Software Preservation

Time 2021-01-08 07:02:40

Web Name: Software Preservation

WebSite: http://sw.ccs.bcs.org

ID:160345

Keywords:

Software,Preservation,

Description:

KDF9 Algol, Usercode and KAL4Facilities for running the softare, and browsing the original source code.Leo IIIFacilities for running Leo III on your own computer.However, network restructuring at TNMoC is likely to have an adverse impact on the abovelinks, but the fall-back facilities below are independent of TNMoC and will continue to be operatonal.Fall-backIn the event that the updated facilities give you problems (e.g. broken links),you can access the older implementations:KDF9 Algol, Usercode and KAL4Facilities for running the softare, and browsing the original source code.Leo IIIFacilities for running Leo III on your own computer.If you find such problems, David Holdsworthwould like to know.RationaleSofware s original raison d tre is its execution.In preserving software the desire is to keep the source text so thatthe style of programming is visible, and to provide facilities for executionof the preserved software on widely available current platforms.Where source text is in a language unlikely to be widely known (often assembly language)the intention is to provide reference information to enable the source textto be understood by a reader with basic programming literacy,as described here.Software and emulation systems are held in normal files, and are independent of themedia upon which they originally lived.As such, the files can be preserved indefinitely merely by copying onto current media.We do not currently have a long-term respoitory for our material.Most of the activity at present concerns rescuing material into a form that can bepreserved long-term, i.e. media neutral and system-neutral,so that it can be copied to any medium, and accessed on any system.Considerable thought is given to future-proofing our material.There are no stipulations as to the acceptability of formats.There is a readiness to preserve significant software in whatever form it exists,even line-printer listings.The crudest preservation is by scanning listings, but we have had considerablesuccess in converting printer listings to executable code (see KDF9 and Leo III sections below).ICL 1900 George 3George 3 was the operating system for the larger ICL 1900 machines.We have preserved the system so that it can be run on PCs and elsewhere.Further information and download facilities are to foundhere.These systems have been built from machine-readable sources with the aid ofpeople from British Steel, Manchester Grammar School and Alexy in St Petersburg,to whom sincere thanks are offered.There is more material on the ICL 1900 maintained by Brian Spoor.A collection of software from KDF9 is gradually being accumulated, some of it rescued from line-printer listings,and some from paper tape.Click herefor more detail and dowloadable software including Algol60 mplementations and assembly languages.Leo IIIIn 2013 we embarked upon the resurrection of the Leo III Intercode system from an ancient lineprinter listing.This is now largely complete, andthere is a facility for excuting this translator on Intercode programs,which can be accessed (but perhaps not 24/7)here.We have still have some editing to do on our on-line manuals OCRedfrom the 1960s paper copies, which can be seenhere,There is much more on the Leo III software resurrectionhere.AtlasWork is in hand on an Atlas emulator, and there had been some successin resurrecting the Brooker-Morris compiler-compiler.Historically, the CCS kept a library of emulators (often called simulators)for running on one s own machine, some of whichalso contained significant software (e.g. Elliott Algol with the 903).Further information and download facilities are to foundhere.Among these emulators is one for the original Cambridge EDSAC,which we have available on-line.CCS presentation 18th October 2012If you were at the London seminar on 18 Oct, and wish to see the rationale for programming in a subset of C,and suggestions for that subset, please clickhere.If you weren t at the London seminar on 18 Oct, and wish to see the PowerPoint presentationit ishere.Instructions for running George3 on your own Raspberry Piare here.including this page.Although many have been updated, some will have slipped through the net.Information on how to convert a settle.dtdns.net link is availablehere.

TAGS:Software Preservation 

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