If Carlsberg made operating systems.... https://www.george3.co.uk/ 2026-04-06T22:42:20+00:00 https://www.george3.co.uk/ https://www.george3.co.uk/_media/wiki/dokuwiki.svg text/html 2025-10-04T05:37:33+00:00 Adrian Cunnelly (adrian.cunnelly@undisclosed.example.com) https://www.george3.co.uk/start?rev=1759556253&do=diff ICL GEORGE 3 Wiki Manuals GIN * Gin Reference Manual (GRM) GEORGE Operating System Source Code * GIN Macros * Universal Identifiers * GEORGE Source * GEORGE Overlays * Overlay Segments * GEORGE Chapters Programming * [Replica of a PLAN Coding Sheet] * PLAN programs * Display first 20 prime numbers Documents * [ICT Marketing spoof - Galactic Storage Device] Useful Links * ICL 1900 site maintained by Brian Spoor: <http://www.icl1900.co.uk> * Computer conser… text/html 2025-10-03T20:18:28+00:00 Adrian Cunnelly (adrian.cunnelly@undisclosed.example.com) https://www.george3.co.uk/gin/chapter1?rev=1759522708&do=diff 1. INTRODUCTION TO GIN 1.0 The Purpose and Nature of GIN GIN is a language for compiling assembly-level programs for the ICL 1900 Series. It shares its instruction set to a large extent with PLAN, but the various directives which control its operation have only enough in common with those of PLAN to make disaster almost certain if they are confused. text/html 2024-01-17T13:35:25+00:00 Adrian Cunnelly (adrian.cunnelly@undisclosed.example.com) https://www.george3.co.uk/george/table-uid?rev=1705498525&do=diff Universal Identifiers A universal identifier is a string of up to 11 alphanumeric characters of which the first letter is in the range A to L. A universal identifier may be defined at any point in the program after #CORE and must be unique. However, the exception to this are universals whose names begin with D and L, these cannot be defined as the compiler will itself assign values to such identifiers as follows: text/html 2017-09-22T15:46:59+00:00 acunnelly (acunnelly@undisclosed.example.com) https://www.george3.co.uk/gin/chapter3?rev=1506095219&do=diff 3 THE SOURCE PROGRAM 3.0 Source formats This section of the manual describes in greater detail the source which GIN will accept. The compiler is regulated by directives and thereby obtains the definitions of a number of identifiers and macros. The identifiers can be combined with other numerical terms to form text/html 2017-07-15T19:54:34+00:00 acunnelly (acunnelly@undisclosed.example.com) https://www.george3.co.uk/source/plan-primes?rev=1500148474&do=diff Display first 20 prime numbers Small PLAN program to display the first 20 prime numbers. #PROGRAM PRIM40/PRIM #DEFINE NUMPRIMES=20 #LOWER PRIMES(NUMPRIMES) [ STORAGE AREA FOR FOUND PRIMES MESS 8H [ OUTPUT BUFFER FOR PRIME NUMBER HTHOU 100000 #PRO #ENT 0 LDN 0 2 [ SAVE 2 AS FIRST PRIME STO 0 PRIMES LDN 1 1 LDN 0 3 [ START AT 3 LDN 4 NUMPRI… text/html 2016-12-08T11:47:58+00:00 acunnelly (acunnelly@undisclosed.example.com) https://www.george3.co.uk/?image=wiki%3Aicl1900.png&ns=wiki&rev=1481197678&tab_details=history&media_do=diff&do=media <img src="https://www.george3.co.uk/_media/wiki/icl1900.png?w=500&amp;h=500&amp;tok=1069f8" alt="icl1900.png" loading="lazy" width="500" height="500" /> text/html 2016-07-07T16:05:30+00:00 acunnelly (acunnelly@undisclosed.example.com) https://www.george3.co.uk/?image=galacticstoragedevice.pdf&ns=0&rev=1467907530&tab_details=history&media_do=diff&do=media <img src="https://www.george3.co.uk/lib/images/fileicons/svg/pdf.svg" alt="galacticstoragedevice.pdf" loading="lazy" width="500" height="500" /> text/html 2016-06-10T23:35:08+00:00 acunnelly (acunnelly@undisclosed.example.com) https://www.george3.co.uk/?image=plancodingsheet-a3.pdf&ns=0&rev=1465601708&tab_details=history&media_do=diff&do=media <img src="https://www.george3.co.uk/lib/images/fileicons/svg/pdf.svg" alt="plancodingsheet-a3.pdf" loading="lazy" width="500" height="500" /> text/html 2016-06-06T08:11:25+00:00 acunnelly (acunnelly@undisclosed.example.com) https://www.george3.co.uk/?image=gin%3Agrm7.3_1.png&ns=gin&rev=1465200685&tab_details=history&media_do=diff&do=media <img src="https://www.george3.co.uk/_media/gin/grm7.3_1.png?w=500&amp;h=500&amp;tok=50be07" alt="grm7.3_1.png" loading="lazy" width="500" height="500" />