Are there any computers that do let you put microcode
into RAM
now-days.
"Now-days"? There are some that do that, some of which are still in
operational shape. Some VAXen, in particular, have something called
"writable control store", which is essentially microcode RAM.
You have a lot of byte code virtual machines out
there.
Such as every x86 processor since, what, the Pentium? They're all RISC
cores (designed for and) running an x86 emulator.
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