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The word size (8 bits,16 bits, or 32 bits) of a microprocessor is the size of the data path in the execution unit. Typically, this is the size of the accumulator.Note: This is the execution unit size, not the bus interface unit size. An example where this matters is the 8088, which is a 16 bit computer running on an 8 bit bus.The 8085 is 8 bits. The 8086/8088 is 16 bits. The 80386 is 32 bits. Modern Intel processors are 64 bits.
word size
The word size of a computer is generally determined by the size of its accumulator. The 8085 was 8 bits. The 8086/8088 was 16 bits. Later incarnations of the Intel x-86 line were 32 bits. Current incarnations of the Intel X-64 line are 64 bits.
An instruction is a command to the microprocessor to perform a given task on specified data. Each instruction has two parts: One is task to be performed,called the operation code (opcode). Second is the data to be operated on, called the operand. It can be specified in various ways,it may include 8bit/16bit data, an internal register, a memory location , or 8bit/16bit address. In some instructions, the operand is implicit. The 8085 instruction set is classified into three groups according to Word size. They are- 1. One word / 1 byte instructions 2. Ttwo word / 2byte instructions 3. Three word / 3byte instructions
Data alignment pertains to the starting address of some block of memory being a multiple of the basic data size, such as a 16 or 32 bit word, or being related to the block size of an IO device, such as a disc drive with a sector size of 512 bytes. The 8085 microprocessor, itself, does not care about alignment, as it is an 8 bit computer running on an 8 bit bus. (The 8086 microprocessor does care, because misalignment can cause performance penalties or corruption, but this article deals with the 8085, not the 8086.) External devices, however, such as the 8237 DMA Controller, may well impose limitations on the starting address of a block transfer, because of their internal design. Each case is specific, so you need to consult the documentation of your specific device.
The 8085 instruction set is classified into three groups according to its Word size. They are 1. One word /1 byte instructions 2. Two word / 2 byte instructions 3. Three word / 3 byte instructions
As quoted from Google Books, "Word size refers to the number of bits that a microprocessor can manipulate at one time."
The 8085 instruction set is classified into the following three groups according to word size: 1. One-word or 1-byte instructions 2. Two-word or 2-byte instructions 3. Three-word or 3-byte instructions
The 8085 is an 8 bit processor, so its word length is 8 bits.
It depends on a type of microprocessor. The simplest microprocessors had memory word only four bits wide and they could have 15 bites of memory. I suppose that it was enough for some simple calculators.