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If the image you saw is like this one, D0-D7 imply bit positions in the status register, called F (for flags) when part of the AF register pair. The Ds are misleading because they imply some (nonexistent) relationship to the D register or the data pins (which are multiplexed with the address lines and are actually called AD0-AD7). Describing bit positions ...


In 8086 assembly that I learnt in Uni, D stood for data. There were four main register groups, AX, BX, CX, DX. Accumulator, Base, Count, and Data. And I suspect it didn't hurt that they were ABCD.


Yes there is difference d0-d7 are 8 bit data bus and D is one of the register in 8085


Robert Harvey is correct. However, you can create an assembly language at the same time you write an assembler. It's a cyclical process, where you add code to the assembler to process your assembly language into operation codes, or opcodes. Ideally, each assembly language instruction is represented by an opcode. Sometimes, one assembly instruction ...


Every microprocessor has an instruction set. Each instruction corresponds to a specific binary code. You can find out which binary code corresponds to which processor instruction by reading the specification sheet for the microprocessor. From there, it's simply a matter of specifying the binary codes in the right order to produce the desired result.

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