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1 bit – 0 or 1, false or true, Low or High (a.k.a. unibit) 1.442695 bits (log 2 e) – approximate size of a nat (a unit of information based on natural logarithms) 1.5849625 bits (log 2 3) – approximate size of a trit (a base-3 digit) 2 1: 2 bits – a crumb (a.k.a. dibit) enough to uniquely identify one base pair of DNA
1×10 6: computing power of the Motorola 68000 commercial computer introduced in 1979. [citation needed] 1.2×10 6: IBM 7030 "Stretch" transistorized supercomputer, 1961; 5×10 6: CDC 6600, first commercially successful supercomputer, 1964 [2] 11×10 6: Intel i386 microprocessor at 33 MHz, 1985; 14×10 6: CDC 7600 supercomputer, 1967 [2]
Historical lowest retail price of computer memory and storage Electromechanical memory used in the IBM 602, an early punch multiplying calculator Detail of the back of a section of ENIAC, showing vacuum tubes Williams tube used as memory in the IAS computer c. 1951 8 GB microSDHC card on top of 8 bytes of magnetic-core memory (1 core is 1 bit.)
The Intel 8008 ("eight-thousand-eight" or "eighty-oh-eight") is an early 8-bit microprocessor capable of addressing 16 KB of memory, introduced in April 1972. The 8008 architecture was designed by Computer Terminal Corporation (CTC) and was implemented and manufactured by Intel.
The Cray-1S, announced in 1979, was an improved Cray-1 that supported a larger main memory of 1, 2 or 4 million words. The larger main memory was made possible through the use of 4,096 x 1-bit bipolar RAM ICs with a 25 ns access time. [15]
It worked with floating-point numbers (7-bit exponent, 16-bit mantissa, and sign bit). The memory used sliding metal parts to store 16 such numbers, and worked well; but the arithmetic unit was less successful, occasionally suffering from certain mechanical engineering problems. The program was read from holes punched in discarded 35 mm movie film.
General home computing and gaming utility emerged at 8-bit word sizes, as 2 8 =256 words, a natural unit of data, became possible. Early 8-bit CPUs (such as the Zilog Z80 and MOS Technology 6502, used in the 1977 PET, TRS-80, and Apple II) inaugurated the era of personal computing. Many 16-bit CPUs already existed in the mid-1970s.
The only widely-used computers with 60-bit words were produced by Control Data Corporation (CDC), [2] including the CDC 6000 series, [3] the CDC 7600, and the CDC Cyber 70 and 170 series. [4] Though the addressable unit was the 60-bit word, instructions were either 15 or 30 bits.