The 22-bit addressing mode and extended branch mode introduced by the 1906 was extended to the 1902A and 1903A, but not the much smaller 1901A. ICL introduced a paging unit to the higher end machines (1904A, 1906A) and a new version of the GEORGE operating system, GEORGE 4, which was compatible with GEORGE 3 but used paged virtual memory in ...

ICL was determined to enter a rapidly growing new segment characterised by companies which were too small to have a DP department. Computing needed to be made simpler. The 2903 range and ME29 range were developed for this segment.

In ICT (and later ICL) it was used in the specification of product requirements, in the measurement of the performance of competitive systems and in the setting of system prices in the market (in general, 1900 prices were set at 5% below the IBM360 (later IBM370) price performance curve).

During the 10 years of market life of the 1900 Range, the specification and measurement of processor performance, initially expressed in individual instruction times, was increasingly specified by standardised “work loads”, instruction mixes that could be coded and measured on all models in the range and on competing systems (with different orde...

ICT (International Computers and Tabulators) on 28 September 1964 announced the 1900 Range of systems, giving great emphasis on program compatibility and portability between all models in the 1900 range (present and future) and modularity via the ICT Standard Interface (“Each 1900 system will grow with the customer’s needs by replacing individua...

• On 17 January 1968 the 1900A series was announced (1901A, 1902A, 1903A, 1904A, 1906A) replacing the whole range. • On 29 Jan.1968: 1000th order taken for 1900's

Pages in category "ICL mainframe computers" The following 62 pages are in this category, out of 62 total. This list may not reflect recent changes. ... ICL 1902S; ICL 1902T; ICT 1903; ICL 1903A; ICL 1903S; ICL 1903T; ICT 1904; ICL 1904A; ICL 1904E; ICL 1904S; ICL 1904T; ICT 1905; ICL 1905E; ICL 1905F; ICT 1906; ICL 1906A; ICL 1906S; ICT 1907 ...

ICT/ICL 1900 seminar in May 1996 (Science Museum – London). It maps the delivery period versus performance of each 1900 model in its successive manifestations (see Sect.1.4), the relative position of the successive enhancements and their relationship with their predecessors

ICL 1900: The new computer room at the Cooperative Wholesale Society (CWS) Menswear Factory in Holbeck, Leeds around 1965. Here the ICL / ICT 1903 system used four magnetic tape units as its sole data storage medium - with punched cards as the input source.

ICL - VME 2900 - Implementing a Transaction Processing System (TPMS 320) ICL 1900 Basic Peripherals. ICL 1900 Series 1900 Driver. ICL 1900 Series Analysis of Massive Survey Files. ICL 1900 Series Central Processors. ICL 1900 Series COBOL. ICL 1900 Series COBOL Compilers.