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I read that Zilog Z-80 is assembler compatible but not binary

At 11:05 PM 9/23/2007, big one wrote:
>I read that Zilog Z-80 is assembler compatible but not binary 
>compatible with Intel 8080. The new CPU have the same number and 
>type of registers and ALU.

In fact the Z80 was a superset of the 8080 instructions set and as 
such it was binary compatible. I have seen more than one instance 
where the same binary object code would run on both CPU's.

>Is there any core project on OpenCores with "Assembler Compatible, 
>but not binary compatible" with major CPU architectures, such as 
>x86, ARM, MIPS, etc?

There have been several MIPS devices in this class, but I have never 
seen an x86 or ARM compatible. When OpenRisc1000 was first announced 
back in 2000 ARM were very quick to warn that people should not try 
to clone its instruction set. MIPS has taken legal action against 
some commercial IP houses selling MIPS work-alikes. The x86 is the 
subject of many closely held patents and I am not sure what fate 
would await an open-IP version of it, but I don't think it would be pretty.

Regards,
John

>If not, is it possible to start a new project?
>Thank you.
>
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