This is crazy. Someone managed to run #Linux (v4.4) on an #Intel 4004 #CPU from 1971, one of the first commercially available microprocessors ever.
The craziest part: It became possible by writing a #MIPS #R3000 #emulator in 4004 #assembler that fits into the 4096 bytes of addressable memory. The emulator then runs the kernel. My mind is blown.
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data0
in reply to data0 • • •It's not exactly fast though
> … the virtual CPU thinks it is running at 1.05MHz. My testing shows that the actual emulated speed of the MIPS guest is around 70Hz at 740KHz. I run the 4004 at 790KHz, so the emulated guest is thus operating at about 74.73Hz. So time for the guest is dilated by 14,030x. This means that **a virtual second is, in real life, around 3h54**. Four hours per virtual second, basically!
StarkRG
in reply to data0 • • •Naked me think of the XKCD "A Bunch Of Rocks" which uses an infinite supply of rocks in an infinite desert to very, very slowly, simulate an entire universe.
xkcd.com/505/