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24-bit, five-digit decimal Memory Address (no 8 - Ten Thousand bit stored) 1 plane 384 cores; The address decoding logic of the Main memory also used two planes of 100 pulse transformer cores per module to generate the X-Y Line half-current pulses. There were two models of the 1620, each having totally different hardware implementations: IBM 1620 I
Some older computers (decimal computers) are decimal digit-addressable. For example, each address in the IBM 1620's magnetic-core memory identified a single six bit binary-coded decimal digit, consisting of a parity bit, flag bit and four numerical bits. [2] The 1620 used 5-digit decimal addresses, so in theory the highest possible address was ...
Printable version; In other projects ... Some [b] decimal computers, e.g., IBM 1620, used binary-coded decimal for memory addresses.
IBM 1620 (decimal architecture, engineering, scientific, and education) IBM had difficulty getting customers to upgrade from the smaller machines to the mainframes because so much software had to be rewritten. The 7010 was introduced in 1962 as a mainframe-sized 1410. The later Systems 360 and 370 could emulate the 1400 machines.
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An early widespread implementation was available via the IBM 1620 of 1959–1970. The 1620 was a decimal-digit machine which used discrete transistors, yet it had hardware (that used lookup tables) to perform integer arithmetic on digit strings of a length that could be from two to whatever memory was available. For floating-point arithmetic ...
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In computer architecture, 12-bit integers, memory addresses, or other data units are those that are 12 bits (1.5 octets) wide. Also, 12-bit central processing unit (CPU) and arithmetic logic unit (ALU) architectures are those that are based on registers, address buses, or data buses of that size.