In computer architecture, 128-bit integers, memory addresses, or other data units are those that are 128 bits (16 octets) wide.
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.
However, these processors do not operate on individual numbers that are 128 binary digits in length; only their vector registers have the size of 128 bits.
The DEC VAX supported operations on 128-bit integer ('O' or octaword) and 128-bit floating-point ('H-float' or HFLOAT) datatypes.
The ICL 2900 Series provided a 128-bit accumulator, and its instruction set included 128-bit floating-point and packed decimal arithmetic.
[5] Among the sixth generation of video game consoles, the Dreamcast and the PlayStation 2 used the term 128-bit in their marketing to describe their capability.
The RISC-V ISA specification from 2016 includes a reservation for a 128-bit version of the architecture, but the details remain undefined intentionally, because there is yet so little practical experience with such large word size.
The Rust programming language has built-in support for 128-bit integers (originally via LLVM), which is implemented on all platforms.