2.How is coded stored in ROM. Is it via magnetisation to give binary 0 and 1. Floppies and hardrives use magnetization. CD's use light. What do ROMs use. What is the material that supports the code made of?
thanks
s
None.
Why is only the latter considered to be
They both can be.
No, it depends on the technology but in general it is stored as charge.
Ian
I think the access time for the next memory location might just be a relevent factor (to OP, you need to find out about caching[1] techniques, sorry don't have time now to find a relevant reference)
[1]or is it cacheing?tim
Code commonly doesn't execure "on" a harddrive, it is loaded into RAM and executed there. Code stored in ROM is often copied to RAM for execution too, but it can be executed directly from ROM. When executing from ROM one would normally build the software differently than for RAM execution - i.e. you need to ensure it's built for the right location in memory [if the code is position dependent], and ensure the code is statically linked etc.
As to "Why is only the latter considered to be embedded?" - the answer is mu.
Depends on the ROM, but normally it's either a stored charge or masked into the semiconductor at fabrication time. Magnetisation is not normally involved.
Electronic switches.
Silicon.
Except the code 'executing' on a hard drive will need to be loaded into RAM before it can actually be executed. Once there, there is no real difference with code execution in ROM
Ian
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