8086 Emulator Download Ds
In 8086 assembly programming, we can only load a data into a segment register by, first loading it into a general purpose register and then we have to move it from this general register to the segment register.
8086 emulator download ds
In the case of 8086 assembly, I figure that the reason is simply that the engineers just didn't create an electric path that could feed a signal from the memory I/O data lines to the lines that write to the segment registers.
The most likely reason is simply one of simplifying the design: it takes extra wiring and gates to do that, and it's an uncommon enough operation (this is the 70's) that it's not worth the real estate in the chip. This is not surprising; the 8086 already went overboard allowing any of the normal registers to be connected to the ALU (arithmetic logic unit) which allows any register to be used as an accumulator. I'm sure that wasn't cheap to do. Most processors at the time only allowed one register (the accumulator) to be used for that purpose.
Supporting a mov Sreg, imm16 encoding would need a separate opcode. This would take extra transistors for 8086 to decode, and it would use up more opcode coding space leaving less room for future extensions. I'm not sure which of these was considered more important by the architect(s) of the 8086 ISA.
Notice that 8086 has special mov AL/AX, moffs opcodes which save 1 byte when loading the accumulator from an absolute address. But it couldn't spare an opcode for mov-immediate to Sreg? This design decision makes good sense. How often do you need to reload a segment register? Very infrequently, and in real large programs it often wouldn't be with a constant (I think). But in code using static data, you might be loading / storing the accumulator to a fixed address inside a loop. (8086 had very weak code-fetch, so code-size = speed most of the time).
Emu8086 is a Microprocessor Emulator with an integrated 8086 Assembler and Free Tutorial. Emulator runs programs on a Virtual Machine, it emulates real hardware, such as screen, memory and input/output devices.
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