What is an ISA and why is it important?
What will be an ideal response?
The ISA (Instruction Set Architecture) serves as a kind of contractual document which allows all parties concerned with the design, implementation and use of a given processor to know what is expected of them and what resources will be afforded by that processor.
As soon as an ISA is finalized:
Implementation engineers can design the detail that will allow the processor to meet the ISA specification
Assembler and compiler writers can create assemblers and compiler for use with the processor long before a working model even exists.
Operating system designers/maintainers can determine what needs to be done to allow their operating system to run on this processor.
I/O Device engineers can design controllers and driver software that will be used with the processor.
Box (or equivalent) engineers can determine how to use the processor in their designs
etc.
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