Table of Word Size Architecture
| Year | Computer Architecture | Word Size | Integer Sizes | Floating-point Sizes | Instruction Sizes | Unit of Address Resolution | Character Size |
| 1837 | Babbage Analytical engine | 50 d | w | — | Five cards were used for different functions, but the exact size of the cards is unknown. | w | — |
| 1941 | Zuse Z3 | 22 bit | — | w | 8 bit | w | — |
| 1942 | ABC | 50 bit | w | — | — | — | — |
| 1944 | Harvard Mark I | 23 d | w | — | 24 bit | — | — |
| 1946 (1948) {1953} | ENIAC (w/Panel #16) {w/Panel #26} | 10 d | w, 2w (w) {w} | — | — (2 d, 4 d, 6 d, 8 d) {2 d, 4 d, 6 d, 8 d} | — — {w} | — |
| 1948 | Manchester Baby | 32 bit | w | — | w | w | — |
| 1951 | UNIVAC I | 12 d | w | — | 1⁄2w | w | 1 d |
| 1952 | IAS machine | 40 bit | w | — | 1⁄2w | w | 5 bit |
| 1952 | Fast Universal Digital Computer M-2 | 34 bit | w? | w | 34 bit = 4-bit opcode plus 3×10 bit address | 10 bit | — |
| 1952 | IBM 701 | 36 bit | 1⁄2w, w | — | 1⁄2w | 1⁄2w, w | 6 bit |
| 1952 | UNIVAC 60 | n d | 1 d, … 10 d | — | — | — | 2 d, 3 d |
| 1952 | ARRA I | 30 bit | w | — | w | w | 5 bit |
| 1953 | IBM 702 | n c | 0 c, … 511 c | — | 5 c | c | 6 bit |
| 1953 | UNIVAC 120 | n d | 1 d, … 10 d | — | — | — | 2 d, 3 d |
| 1953 | ARRA II | 30 bit | w | 2w | 1⁄2w | w | 5 bit |
| 1954 (1955) | IBM 650 (w/IBM 653) | 10 d | w | — (w) | w | w | 2 d |
| 1954 | IBM 704 | 36 bit | w | w | w | w | 6 bit |
| 1954 | IBM 705 | n c | 0 c, … 255 c | — | 5 c | c | 6 bit |
| 1954 | IBM NORC | 16 d | w | w, 2w | w | w | — |
| 1956 | IBM 305 | n d | 1 d, … 100 d | — | 10 d | d | 1 d |
| 1956 | ARMAC | 34 bit | w | w | 1⁄2w | w | 5-bit, 6 bit |
| 1956 | LGP-30 | 31 bit | w | — | 16 bit | w | 6 bit |
| 1957 | Autonetics Recomp I | 40 bit | w, 79 bit, 8 d, 15 d | — | 1⁄2w | 1⁄2w, w | 5 bit |
| 1958 | UNIVAC II | 12 d | w | — | 1⁄2w | w | 1 d |
| 1958 | SAGE | 32 bit | 1⁄2w | — | w | w | 6 bit |
| 1958 | Autonetics Recomp II | 40 bit | w, 79 bit, 8 d, 15 d | 2w | 1⁄2w | 1⁄2w, w | 5 bit |
| 1958 | Setun | 6 trit (~9.5 bits)[b] | up to 6 tryte | up to 3 trytes | 4 trit? | ||
| 1958 | Electrologica X1 | 27 bit | w | 2w | w | w | 5-bit, 6 bit |
| 1959 | IBM 1401 | n c | 1 c, … | — | 1 c, 2 c, 4 c, 5 c, 7 c, 8 c | c | 6 bit + wm |
| 1959 (TBD) | IBM 1620 | n d | 2 d, … | — (4 d, … 102 d) | 12 d | d | 2 d |
| 1960 | LARC | 12 d | w, 2w | w, 2w | w | w | 2 d |
| 1960 | CDC 1604 | 48 bit | w | w | 1⁄2w | w | 6 bit |
| 1960 | IBM 1410 | n c | 1 c, … | — | 1 c, 2 c, 6 c, 7 c, 11 c, 12 c | c | 6 bit + wm |
| 1960 | IBM 7070 | 10 d[c] | w, 1-9 d | w | w | w, d | 2 d |
| 1960 | PDP-1 | 18 bit | w | — | w | w | 6 bit |
| 1960 | Elliott 803 | 39 bit | |||||
| 1961 | IBM 7030 (Stretch) | 64 bit | 1-bit, … 64-bit, 1 d, … 16 d | w | 1⁄2w, w | bit (integer), 1⁄2w (branch), w (float) | 1 bit, … 8 bit |
| 1961 | IBM 7080 | n c | 0 c, … 255 c | — | 5 c | c | 6 bit |
| 1962 | GE-6xx | 36 bit | w, 2 w | w, 2 w, 80 bit | w | w | 6-bit, 9 bit |
| 1962 | UNIVAC III | 25 bit | w, 2w, 3w, 4w, 6 d, 12 d | — | w | w | 6 bit |
| 1962 | Autonetics D-17B Minuteman I Guidance Computer | 27 bit | 11-bit, 24 bit | — | 24 bit | w | — |
| 1962 | UNIVAC 1107 | 36 bit | 1⁄6w, 1⁄3w, 1⁄2w, w | w | w | w | 6 bit |
| 1962 | IBM 7010 | n c | 1 c, … | — | 1 c, 2 c, 6 c, 7 c, 11 c, 12 c | c | 6 b + wm |
| 1962 | IBM 7094 | 36 bit | w | w, 2w | w | w | 6 bit |
| 1962 | SDS 9 Series | 24 bit | w | 2w | w | w | |
| 1963 (1966) | Apollo Guidance Computer | 15 bit | w | — | w, 2w | w | — |
| 1963 | Saturn Launch Vehicle Digital Computer | 26 bit | w | — | 13 bit | w | — |
| 1964/1966 | PDP-6/PDP-10 | 36 bit | w | w, 2 w | w | w | 6 bit 7-bit (typical) 9 bit |
| 1964 | Titan | 48 bit | w | w | w | w | w |
| 1964 | CDC 6600 | 60 bit | w | w | 1⁄4w, 1⁄2w | w | 6 bit |
| 1964 | Autonetics D-37C Minuteman II Guidance Computer | 27 bit | 11-bit, 24 bit | — | 24 bit | w | 4-bit, 5 bit |
| 1965 | Gemini Guidance Computer | 39 bit | 26 bit | — | 13 bit | 13-bit, 26 | —bit |
| 1965 | IBM 1130 | 16 bit | w, 2w | 2w, 3w | w, 2w | w | 8 bit |
| 1965 | IBM System/360 | 32 bit | 1⁄2w, w, 1 d, … 16 d | w, 2w | 1⁄2w, w, 11⁄2w | 8 bit | 8 bit |
| 1965 | UNIVAC 1108 | 36 bit | 1⁄6w, 1⁄4w, 1⁄3w, 1⁄2w, w, 2w | w, 2w | w | w | 6-bit, 9 bit |
| 1965 | PDP-8 | 12 bit | w | — | w | w | 8 bit |
| 1965 | Electrologica X8 | 27 bit | w | 2w | w | w | 6-bit, 7 bit |
| 1966 | SDS Sigma 7 | 32 bit | 1⁄2w, w | w, 2w | w | 8 bit | 8 bit |
| 1969 | Four-Phase Systems AL1 | 8 bit | w | — | |||
| 1970 | MP944 | 20 bit | w | — | |||
| 1970 | PDP-11 | 16 bit | w | 2w, 4w | w, 2w, 3w | 8 bit | 8 bit |
| 1971 | CDC STAR-100 | 64 bit | 1⁄2w, w | 1⁄2w, w | 1⁄2w, w | bit | 8 bit |
| 1971 | TMS1802NC | 4 bit | w | — | — | ||
| 1971 | Intel 4004 | 4 bit | w, d | — | 2w, 4w | w | — |
| 1972 | Intel 8008 | 8 bit | w, 2 d | — | w, 2w, 3w | w | 8 bit |
| 1972 | Calcomp 900 | 9 bit | w | — | w, 2w | w | 8 bit |
| 1974 | Intel 8080 | 8 bit | w, 2w, 2 d | — | w, 2w, 3w | w | 8 bit |
| 1975 | ILLIAC IV | 64 bit | w | w, 1⁄2w | w | w | — |
| 1975 | Motorola 6800 | 8 bit | w, 2 d | — | w, 2w, 3w | w | 8 bit |
| 1975 | MOS Tech. 6501 MOS Tech. 6502 | 8 bit | w, 2 d | — | w, 2w, 3w | w | 8 bit |
| 1976 | Cray-1 | 64 bit | 24-bit, w | w | 1⁄4w, 1⁄2w | w | 8 bit |
| 1976 | Zilog Z80 | 8 bit | w, 2w, 2 d | — | w, 2w, 3w, 4w, 5w | w | 8 bit |
| 1978 (1980) | 16-bit x86 (Intel 8086) (w/floating point: Intel 8087) | 16 bit | 1⁄2w, w, 2 d | — (2w, 4w, 5w, 17 d) | 1⁄2w, w, … 7w | 8 bit | 8 bit |
| 1978 | VAX | 32 bit | 1⁄4w, 1⁄2w, w, 1 d, … 31 d, 1 bit, … 32 bit | w, 2w | 1⁄4w, … 141⁄4w | 8 bit | 8 bit |
| 1979 (1984) | Motorola 68000 series (w/floating point) | 32 bit | 1⁄4w, 1⁄2w, w, 2 d | — (w, 2w, 21⁄2w) | 1⁄2w, w, … 71⁄2w | 8 bit | 8 bit |
| 1985 | IA-32 (Intel 80386) (w/floating point) | 32 bit | 1⁄4w, 1⁄2w, w | — (w, 2w, 80 bit) | 8 bit, … 120 bit 1⁄4w … 33⁄4w | 8 bit | 8 bit |
| 1985 | ARMv1 | 32 bit | 1⁄4w, w | — | w | 8 bit | 8 bit |
| 1985 | MIPS I | 32 bit | 1⁄4w, 1⁄2w, w | w, 2w | w | 8 bit | 8 bit |
| 1991 | Cray C90 | 64 bit | 32-bit, w | w | 1⁄4w, 1⁄2w, 48 bit | w | 8 bit |
| 1992 | Alpha | 64 bit | 8 bit, 1⁄4w, 1⁄2w, w | 1⁄2w, w | 1⁄2w | 8 bit | 8 bit |
| 1992 | PowerPC | 32 bit | 1⁄4w, 1⁄2w, w | w, 2w | w | 8 bit | 8 bit |
| 1996 | ARMv4 (w/Thumb) | 32 bit | 1⁄4w, 1⁄2w, w | — | w (1⁄2w, w) | 8 bit | 8 bit |
| 2000 | IBM z/Architecture (w/vector facility) | 64 bit | 1⁄4w, 1⁄2w, w 1 d, … 31 d | 1⁄2w, w, 2w | 1⁄4w, 1⁄2w, 3⁄4w | 8 bit | 8 bit, UTF-16, UTF-32 |
| 2001 | IA-64 | 64 bit | 8 bit, 1⁄4w, 1⁄2w, w | 1⁄2w, w | 41-bit (in 128-bit bundles) | 8 bit | 8 bit |
| 2001 | ARMv6 (w/VFP) | 32 bit | 8-bit, 1⁄2w, w | — (w, 2w) | 1⁄2w, w | 8 bit | 8 bit |
| 2003 | x86-64 | 64 bit | 8 bit, 1⁄4w, 1⁄2w, w | 1⁄2w, w, 80 bit | 8 bit, … 120 bit | 8 bit | 8 bit |
| 2013 | ARMv8-A and ARMv9-A | 64 bit | 8 bit, 1⁄4w, 1⁄2w, w | 1⁄2w, w | 1⁄2w | 8 bit | 8 bit |
[b] The bit equivalent is computed by taking the amount of information entropy provided by the trit, which is log2(3). This gives an equivalent of about 9.51 bits for 6 trits.
[c] Three-state sign
key: bit: bits, d: decimal digits, w: word size of architecture, n: variable size
Word (computer architecture). (2022, November 22). In Wikipedia. https://en.wikipedia.org/wiki/Word_(computer_architecture)