Because that's how Intel designed it.
They chose a 6 byte queue in the 8086 in order to optimize speed versus latency of the execution unit versus the bus interface unit. The decision for 6 bytes, as compared to 4 or 8 or some other number was a cost tradeoff and a recognition of the average mix of instruction execution cycle times in a typical processing thread.
In 8086 the instruction queue is 6 byte long. This is because even the longest 8086 instruction is 6 byte long. Thus it is possible to prefetch even the longest instruction in the instruction set.
in 8086, there is instruction queue of 6 byte. It is one of the reason behind giving name. 8086 was introducing pipeline architecture.
8086 is a small 4 or 6 byte instruction cache or queue that perfetched a few instructions before they were executed. In addition, the 8086 addressed 1M byte of memory, which is 16 times more than 8085. N.K.Jha narayankumarjha2010@gmail.com
In terms of computer language a pipeline is a set of data elements which are combined together and the yield or output of one element is taken as input for the other. In an 8086 microprocessor a bus used to execute data with help of 6-byte prefetch que.
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byte ptr is an assembler directive that says the following operand is an address of a byte.
8086 has 20 address lines. Therefore it can address 220 bits or 1,048,576 bits of memory, or roughly 1 MB (mega byte).
queue of 8086 microprocessor is 6 bits
Because the 8086 is a 16 bit processor. Memory is organized as 512 MW of memory, or 1024 MB of memory.
The BHE (Bus High Enable) pin on the 8086 is latched by the 8282 in order to indicate if a write cycle is a word (BHE=1) or byte (BHE=0) cycle.
In the 8086 microprocessor, memory is organized into segments and can be accessed in bytes or words. Even-addressed bytes are accessed directly using their address, while odd-addressed bytes are accessed through a combination of the even address and a specific instruction. For example, to access an odd byte, the CPU reads the word containing that byte, performing a mask operation to isolate the desired odd byte. Since the 8086 is a 16-bit architecture, it can handle both even and odd addresses efficiently, ensuring proper alignment for data retrieval.
BHE is used to enable the high order bus so as to differentiate between a word operation and a byte operation.