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 ...

The 1902A used cheaper timing circuits and ran at a slower clock rate. The 1901A used a new compact design incorporating a printer in the same housing as the processor. It had a new, low cost Twin Exchangeable Disc system.

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...

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 1901S; ICL 1901T; ICT 1902; ICL 1902A; 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 ...

• 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

2010年3月7日 · After ICL had introduced the "New Range" (NR) series of computers during the 70s, marketed as the 2900 series, the 1900 series actually lived on as there was such a wealth of software written for it: The ICL 2903/2904, designed and built in Stevenage, which were really successors to the 1902A/3A machines as they had the same target instruction ...

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...

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

Around 1963 Ferranti were looking for a system below the speed of Orion and Atlas to replace Pegasus, Mercury and Sirius. Their Canadian subsidiary, Ferranti Packard had recently visited the UK, and based on their knowledge of the Ferranti they designed the FP6000.

ICL's replacement for its earlier 1900 Series and System 4 computers. Specifically, the 2903 and 2904 fit into the group spanned by the low-cost 190IA and the disc-based 190 I S systems through the more costly 1902A. The ICL 2903 and 2904 can be characterized as a family of small to medium-scale business computer systems that