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- IBM_1620_Model_II abstract "The IBM 1620 Model II (commonly called simply the Model II) was a vastly improved implementation, compared to the original Model I, of the IBM 1620 scientific computer architecture.It had basic ALU hardware for addition and subtraction, but multiplication was still done by table lookup in core memory. Multiplication used a 200 digit table (@ address 00100..00299). Rather than being an available option, as in the Model I, the divide hardware using a repeated subtraction algorithm, was built in. Floating point arithmetic was an available option, as were octal input/output, logical operations, and base conversion to/from decimal instructions.The core memory (@ address 00300..00399) that was freed by the replacement of the addition table with hardware was used for storage of two selectable "bands" of seven 5-digit index registers.The console typewriter was replaced with a modified Selectric typewriter, which could type at 15.5 cps — a 55% improvement over the Model I.The entire core memory was in the IBM 1625 memory unit. Memory cycle time was halved compared to the Model I's (internal or 1623 memory unit), to 10 µs (i.e., the cycle speed was raised to 100 kHz) by using faster cores. A Memory Address Register Storage (MARS) core memory read, clear, or write operation took 1.5 µs and each write operation was automatically (but not necessarily immediately) preceded by a read or clear operation of the same "register(s)" during the 10 µs memory cycle.The processor clock speed was also doubled, to 2 MHz, which was still divided by 20 by a 10 position ring counter to provide the system timing/control signals.The fetch/execute mechanism was completely redesigned, optimizing the timing and allowing partial fetches when the P or Q fields were not needed. Instructions took either 1, 4, or 6 Memory cycles (10 µs, 40 µs, or 60 µs) to fetch and a variable number of memory cycles to execute. Indirect addressing added 3 memory cycles (30 µs) for each level of indirection. Indexed addressing added 5 memory cycles (50 µs) for each level of indexing. Indirect and indexed addressing could be combined at any level of indirection or indexing.".
- IBM_1620_Model_II wikiPageExternalLink A26-5781-2_1620mod2.pdf.
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- IBM_1620_Model_II wikiPageWikiLink Arithmetic_and_logical_unit.
- IBM_1620_Model_II wikiPageWikiLink Arithmetic_logic_unit.
- IBM_1620_Model_II wikiPageWikiLink Category:IBM_transistorized_computers.
- IBM_1620_Model_II wikiPageWikiLink Core_memory.
- IBM_1620_Model_II wikiPageWikiLink Floating_point.
- IBM_1620_Model_II wikiPageWikiLink Hertz.
- IBM_1620_Model_II wikiPageWikiLink IBM_1620.
- IBM_1620_Model_II wikiPageWikiLink IBM_1620_Model_I.
- IBM_1620_Model_II wikiPageWikiLink IBM_7090.
- IBM_1620_Model_II wikiPageWikiLink IBM_Selectric_typewriter.
- IBM_1620_Model_II wikiPageWikiLink Index_register.
- IBM_1620_Model_II wikiPageWikiLink Indirection.
- IBM_1620_Model_II wikiPageWikiLink Kilohertz.
- IBM_1620_Model_II wikiPageWikiLink Magnetic-core_memory.
- IBM_1620_Model_II wikiPageWikiLink Megahertz.
- IBM_1620_Model_II wikiPageWikiLink Microsecond.
- IBM_1620_Model_II wikiPageWikiLink Octal.
- IBM_1620_Model_II wikiPageWikiLink Ring_counter.
- IBM_1620_Model_II wikiPageWikiLinkText "1620 II".
- IBM_1620_Model_II wikiPageWikiLinkText "IBM 1620 II".
- IBM_1620_Model_II wikiPageWikiLinkText "IBM 1620 Model II".
- IBM_1620_Model_II wikiPageWikiLinkText "IBM 1620".
- IBM_1620_Model_II wikiPageWikiLinkText "IBM_1620_Model_II".
- IBM_1620_Model_II wikiPageWikiLinkText "Model II".
- IBM_1620_Model_II hasPhotoCollection IBM_1620_Model_II.
- IBM_1620_Model_II wikiPageUsesTemplate Template:Empty_section.
- IBM_1620_Model_II subject Category:IBM_transistorized_computers.
- IBM_1620_Model_II type Article.
- IBM_1620_Model_II type Article.
- IBM_1620_Model_II type Computer.
- IBM_1620_Model_II comment "The IBM 1620 Model II (commonly called simply the Model II) was a vastly improved implementation, compared to the original Model I, of the IBM 1620 scientific computer architecture.It had basic ALU hardware for addition and subtraction, but multiplication was still done by table lookup in core memory. Multiplication used a 200 digit table (@ address 00100..00299). Rather than being an available option, as in the Model I, the divide hardware using a repeated subtraction algorithm, was built in.".
- IBM_1620_Model_II label "IBM 1620 Model II".
- IBM_1620_Model_II sameAs m.0m_nd.
- IBM_1620_Model_II sameAs Q5968583.
- IBM_1620_Model_II sameAs Q5968583.
- IBM_1620_Model_II wasDerivedFrom IBM_1620_Model_II?oldid=411551077.
- IBM_1620_Model_II isPrimaryTopicOf IBM_1620_Model_II.