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You can also implement a Sparcstation 5 on an FPGA (and not only in qemu) thanks to temlib: http://temlib.org/site/

> Operating range : (altitude < 18km) or (speed < 515m/sec), both not exceeded simultaneously

Is that a limitation so that you don't use it for missile guidance?

Yep. Same reason your phone's GPS won't work above a certain speed and/or altitude.