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- IBM_1620_Model_I abstract "The IBM 1620 Model I was the original implementation of the IBM 1620 scientific computer, introduced in 1959.This unit (commonly called "1620" until the Model II was introduced) was produced as inexpensively as IBM could make it, in order to keep the price low. One industry magazine (Datamation) mentioned that the 1620 was the first IBM computer for which the basic system could be leased for a monthly rate that was numerically smaller than its model number.It did not even have conventional ALU hardware: all arithmetic was done by table lookup in core memory. Addition and Subtraction used a 100-digit table (@ address 00300..00399). Multiplication used a 200-digit table (@ address 00100..00299). In the basic machine division used software subroutines, but optional divide hardware could be installed using a repeated subtraction algorithm. Floating point arithmetic instructions were an available option (if the divide option was installed).The console typewriter was a modified Model B1, which typed at only 10 characters per second. (This typewriter had a very 'nasty' habit of breaking off its "0" hammer and throwing it across the room in the middle of a long core dump. )The first 20,000 decimal digits of core memory were internal to the CPU itself (which reduced the floor space requirements of the basic system). Expansion to either 40,000 or 60,000 decimal digits required the addition of an IBM 1623 Memory unit. The memory cycle time was 20μs ( that is, the memory speed was 50kHz = 1/20th of a MHz). A Memory Address Register Storage (MARS) Core memory read, clear, or write operation took 2 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 20 μs memory cycle.The central processor clock speed was 1 MHz, which was divided by 20 by a 10 position ring counter to provide the system timing/control signals.Instructions took 8 memory cycles (160 μs) to fetch and a variable number of memory cycles to execute. Indirect addressing added 4 memory cycles (80 μs) for each level of indirection.".
- IBM_1620_Model_I thumbnail IBM_1620_Model_1.jpg?width=300.
- IBM_1620_Model_I wikiPageExternalLink A26-5706-3_1620model1cpu.pdf.
- IBM_1620_Model_I wikiPageID "92584".
- IBM_1620_Model_I wikiPageLength "4396".
- IBM_1620_Model_I wikiPageOutDegree "19".
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- IBM_1620_Model_I wikiPageWikiLink Arithmetic_and_logical_unit.
- IBM_1620_Model_I wikiPageWikiLink Arithmetic_logic_unit.
- IBM_1620_Model_I wikiPageWikiLink Category:IBM_transistorized_computers.
- IBM_1620_Model_I wikiPageWikiLink Central_Processing_Unit.
- IBM_1620_Model_I wikiPageWikiLink Central_processing_unit.
- IBM_1620_Model_I wikiPageWikiLink Core_dump.
- IBM_1620_Model_I wikiPageWikiLink Core_memory.
- IBM_1620_Model_I wikiPageWikiLink Datamation.
- IBM_1620_Model_I wikiPageWikiLink Hertz.
- IBM_1620_Model_I wikiPageWikiLink IBM.
- IBM_1620_Model_I wikiPageWikiLink IBM_1620.
- IBM_1620_Model_I wikiPageWikiLink IBM_1620_Model_II.
- IBM_1620_Model_I wikiPageWikiLink IBM_Electric_typewriter.
- IBM_1620_Model_I wikiPageWikiLink International_Business_Machines.
- IBM_1620_Model_I wikiPageWikiLink Kilohertz.
- IBM_1620_Model_I wikiPageWikiLink Magnetic-core_memory.
- IBM_1620_Model_I wikiPageWikiLink Megahertz.
- IBM_1620_Model_I wikiPageWikiLink Method_of_complements.
- IBM_1620_Model_I wikiPageWikiLink Microsecond.
- IBM_1620_Model_I wikiPageWikiLink Ring_counter.
- IBM_1620_Model_I wikiPageWikiLink Sense_switch.
- IBM_1620_Model_I wikiPageWikiLink Tens_complement.
- IBM_1620_Model_I wikiPageWikiLink File:1620_Model_I_Layout.png.
- IBM_1620_Model_I wikiPageWikiLink File:IBM_1620_Model_1.jpg.
- IBM_1620_Model_I wikiPageWikiLinkText "1620 I".
- IBM_1620_Model_I wikiPageWikiLinkText "IBM 1620 I".
- IBM_1620_Model_I wikiPageWikiLinkText "IBM 1620 Model I".
- IBM_1620_Model_I wikiPageWikiLinkText "IBM_1620_Model_I".
- IBM_1620_Model_I wikiPageWikiLinkText "Model I".
- IBM_1620_Model_I hasPhotoCollection IBM_1620_Model_I.
- IBM_1620_Model_I wikiPageUsesTemplate Template:Empty_section.
- IBM_1620_Model_I wikiPageUsesTemplate Template:Refimprove.
- IBM_1620_Model_I subject Category:IBM_transistorized_computers.
- IBM_1620_Model_I hypernym Implementation.
- IBM_1620_Model_I type Article.
- IBM_1620_Model_I type Software.
- IBM_1620_Model_I type Article.
- IBM_1620_Model_I type Computer.
- IBM_1620_Model_I comment "The IBM 1620 Model I was the original implementation of the IBM 1620 scientific computer, introduced in 1959.This unit (commonly called "1620" until the Model II was introduced) was produced as inexpensively as IBM could make it, in order to keep the price low.".
- IBM_1620_Model_I label "IBM 1620 Model I".
- IBM_1620_Model_I sameAs m.0m_n1.
- IBM_1620_Model_I sameAs Q5968581.
- IBM_1620_Model_I sameAs Q5968581.
- IBM_1620_Model_I wasDerivedFrom IBM_1620_Model_I?oldid=652185983.
- IBM_1620_Model_I depiction IBM_1620_Model_1.jpg.
- IBM_1620_Model_I isPrimaryTopicOf IBM_1620_Model_I.