ICT 1900 series

ICT 1900 was a family of mainframe computers released by International Computers and Tabulators (ICT) and later International Computers Limited (ICL) during the 1960s and 1970s. The 1900 series was notable for being one of the few non-American competitors to the IBM System/360, enjoying significant success in the European and British Commonwealth markets.

ICT 1900
DesignerFerranti-Packard/ICT/ICL
Bits24-bit
Introduced1964
DesignCISC
TypeRegister–Register
Register–Memory
Memory–Memory (move)
EncodingFixed
BranchingComparison, carry, overflow, indexing, counting
Page size1024 words (1904A/S, 1906A/S, 1903T)
Extensionsextended floating point in 1906/7
Registers
General-purpose8 24-bit (3 usable for indexing)
Floating point1 48-bit (96-bit if the extended floating point is present)