Table of Word Sizes
| key: b: bits, d: decimal digits, w: word size of architecture, n: variable size | |||||||
|---|---|---|---|---|---|---|---|
| Year | Computer Architecture |
Word Size w |
Integer Sizes |
Floating Point Sizes |
Instruction Sizes |
Unit of Address Resolution |
Char Size |
| 1837 | Babbage Analytical engine |
50 d | w | — | 5 different cards were used for different functions, exact size of cards not known | w | — |
| 1941 | Zuse Z3 | 22 b | — | w | 8 b | w | — |
| 1942 | ABC | 50 b | w | — | — | — | — |
| 1944 | Harvard Mark I | 23 d | w | — | 24 b | — | — |
| 1946 (1948) {1953} |
ENIAC (w/ Panel #16) {w/ Panel #26} |
10 d | w, 2w (w) {w} |
— | — (2d, 4d, 6d, 8d) {2d, 4d, 6d, 8d} |
— — {w} |
— |
| Year | Computer Architecture |
Word Size w |
Integer Sizes |
Floating Point Sizes |
Instruction Sizes |
Unit of Address Resolution |
Char Size |
| 1951 | UNIVAC I | 12 d | w | — | ½w | w | 1 d |
| 1952 | IAS machine | 40 b | w | — | ½w | w | 5 b |
| 1952 | Fast Universal Digital Computer M-2 | 34 b | w? | w | 34 b = 4 b opcode plus 3× 10b address | 10 b | — |
| 1952 | IBM 701 | 36 b | ½w, w | — | ½w | ½w, w | 6 b |
| 1952 | UNIVAC 60 | n d | 1d, ... 10d | — | — | — | 2d, 3d |
| 1953 | IBM 702 | n d | 0d, ... 511d | — | 5d | d | 1 d |
| 1953 | UNIVAC 120 | n d | 1d, ... 10d | — | — | — | 2d, 3d |
| 1954 (1955) |
IBM 650 (w/IBM 653) |
10 d | w | — (w) |
w | w | 2 d |
| 1954 | IBM 704 | 36 b | w | w | w | w | 6 b |
| 1954 | IBM 705 | n d | 0d, ... 255d | — | 5d | d | 1 d |
| 1954 | IBM NORC | 16 d | w | w, 2w | w | w | — |
| 1956 | IBM 305 | n d | 1d, ... 100d | — | 10d | d | 1 d |
| Year | Computer Architecture |
Word Size w |
Integer Sizes |
Floating Point Sizes |
Instruction Sizes |
Unit of Address Resolution |
Char Size |
| 1957 | Autonetics Recomp I | 40 b | w, 79 b, 8d, 15d | — | ½w | ½w, w | 5 b |
| 1958 | UNIVAC II | 12 d | w | — | ½w | w | 1 d |
| 1958 | SAGE | 32 b | ½w | — | w | w | 6 b |
| 1958 | Autonetics Recomp II | 40 b | w, 79 b, 8d, 15d | 2w | ½w | ½w, w | 5 b |
| 1959 | IBM 1401 | n d | 1d, ... | — | d, 2d, 4d, 5d, 7d, 8d | d | 1 d |
| 1959 (TBD) |
IBM 1620 | n d | 2d, ... | — (4d, ... 102d) |
12d | d | 2 d |
| 1960 | LARC | 12 d | w, 2w | w, 2w | w | w | 2 d |
| 1960 | CDC 1604 | 48 b | w | w | ½w | w | 6 b |
| 1960 | IBM 1410 | n d | 1d, ... | — | d, 2d, 6d, 7d, 11d, 12d | d | 1 d |
| 1960 | IBM 7070 | 10 d | w | w | w | w, d | 2 d |
| 1960 | PDP-1 | 18 b | w | — | w | w | 6 b |
| 1961 | IBM 7030 (Stretch) |
64 b | 1b, ... 64b, 1d, ... 16d |
w | ½w, w | b, ½w, w | 1 b, ... 8 b |
| 1961 | IBM 7080 | n d | 0d, ... 255d | — | 5d | d | 1 d |
| Year | Computer Architecture |
Word Size w |
Integer Sizes |
Floating Point Sizes |
Instruction Sizes |
Unit of Address Resolution |
Char Size |
| 1962 | UNIVAC III | 25 b, 6 d | w, 2w, 3w, 4w | — | w | w | 6 b |
| 1962 | Autonetics D-17B Minuteman I Guidance Computer |
27 b | 11 b, 24 b | — | 24 b | w | — |
| 1962 | UNIVAC 1107 | 36 b | 1/6w, ⅓w, ½w, w | w | w | w | 6 b |
| 1962 | IBM 7010 | n d | 1d, ... | — | d, 2d, 6d, 7d, 11d, 12d | d | 1 d |
| 1962 | IBM 7094 | 36 b | w | w, 2w | w | w | 6 b |
| 1963 | Gemini Guidance Computer | 39 b | 26 b | — | 13 b | 13 b, 26 b | — |
| 1963 (1966) |
Apollo Guidance Computer | 15 b | w | — | w, 2w | w | — |
| 1963 | Saturn Launch Vehicle Digital Computer | 26 b | w | — | 13 b | w | — |
| Year | Computer Architecture |
Word Size w |
Integer Sizes |
Floating Point Sizes |
Instruction Sizes |
Unit of Address Resolution |
Char Size |
| 1964 | CDC 6600 | 60 b | w | w | ¼w, ½w | w | 6 b |
| 1964 | Autonetics D-37C Minuteman II Guidance Computer |
27 b | 11 b, 24 b | — | 24 b | w | 4 b, 5 b |
| 1965 | IBM 360 | 32 b | ½w, w, 1d, ... 16d |
w, 2w | ½w, w, 1½w | 8 b | 8 b |
| 1965 | UNIVAC 1108 | 36 b | 1/6w, ¼w, ⅓w, ½w, w, 2w | w, 2w | w | w | 6 b, 9 b |
| 1965 | PDP-8 | 12 b | w | — | w | w | 8 b |
| 1970 | PDP-11 | 16 b | w | 2w, 4w | w, 2w, 3w | 8 b | 8 b |
| 1971 | Intel 4004 | 4 b | w, d | — | 2w, 4w | w | — |
| 1972 | Intel 8008 | 8 b | w, 2d | — | w, 2w, 3w | w | 8 b |
| 1972 | Calcomp 900 | 9 b | w | — | w, 2w | w | 8 b |
| 1974 | Intel 8080 | 8 b | w, 2w, 2d | — | w, 2w, 3w | w | 8 b |
| 1975 | ILLIAC IV | 64 b | w | w, ½w | w | w | — |
| 1975 | Motorola 6800 | 8 b | w, 2d | — | w, 2w, 3w | w | 8 b |
| 1975 | MOS Tech. 6501 MOS Tech. 6502 |
8 b | w, 2d | — | w, 2w, 3w | w | 8 b |
| 1976 | Cray-1 | 64 b | 24 b, w | w | ¼w, ½w | w | 8 b |
| 1976 | Zilog Z80 | 8 b | w, 2w, 2d | — | w, 2w, 3w, 4w, 5w | w | 8 b |
| Year | Computer Architecture |
Word Size w |
Integer Sizes |
Floating Point Sizes |
Instruction Sizes |
Unit of Address Resolution |
Char Size |
| 1978 (1980) |
Intel 8086 (w/Intel 8087) |
16 b | ½w, w, 2d (w, 2w, 4w) |
— (2w, 4w, 5w, 17d) |
½w, w, ... 7w | 8 b | 8 b |
| 1978 | VAX-11/780 | 32 b | ¼w, ½w, w, 1d, ... 31d, 1b, ... 32b | w, 2w | ¼w, ... 14¼w | 8 b | 8 b |
| 1979 | Motorola 68000 | 32 b | ¼w, ½w, w, 2d | — | ½w, w, ... 7½w | 8 b | 8 b |
| 1982 (1983) |
Motorola 68020 (w/Motorola 68881) |
32 b | ¼w, ½w, w, 2d | — (w, 2w, 2½w) |
½w, w, ... 7½w | 8 b | 8 b |
| 1985 | Intel 80386 | 32 b | ½w, w, 2d w, 2w, 4w |
2w, 4w, 5w, 17d | ½w, w, ... 7w | 8 b | 8 b |
| 1985 | ARM1 | 32 b | w | — | w | 8 b | 8 b |
| 1985 | MIPS | 32 b | ¼w, ½w, w | w, 2w | w | 8 b | 8 b |
| 1989 | Motorola 68040 | 32 b | ¼w, ½w, w, 2d | w, 2w, 2½w | ½w, w, ... 7½w | 8 b | 8 b |
| 1991 | Alpha | 64 b | ¼w, ½w, w | w, 2w | ½w | 8 b | 8 b |
| 1991 | Cray C90 | 64 b | 32 b, w | w | ¼w, ½w, 48b | w | 8 b |
| 1991 | PowerPC | 32–64 b | ¼w, ½w, w | w, 2w | w | 8 b | 8 b |
| 2000 | IA-64 | 64 b | 8 b, ¼w, ½w, w | ½w, w | 41 b | 8 b | 8 b |
| 2002 | XScale | 32 b | w | w, 2w | ½w, w | 8 b | 8 b |
| Year | Computer Architecture |
Word Size w |
Integer Sizes |
Floating Point Sizes |
Instruction Sizes |
Unit of Address Resolution |
Char Size |
| key: b: bits, d: decimal digits, w: word size of architecture, n: variable size | |||||||
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