What are the really unusual or weird computers?

Billy Pettit wrote: Nanodata machines had some instructions on the fly in the hardware similar to the "microcoding" of the PDP8 but on a microcode level, and a lot more complicated. Microdata's microcoded machines had a 200ns micromachine running from prom and reading a core memory which could contain any macro machines data and instructions and only required changing out of the prom firmware to change the machine entirely. But on the hardware level it didnt really do much to modify instruction behaviour, other than a register that ored over some fields. not really as powerful as what nanodata did. I know bitsaves has the nanodata manuals and the microdata manuals. I hope to get a microdata microcode emulator completed and released someday, however firmware will be a problem finding and getting out. I haven't heard of anything available for the Nanodata machines in the way of software. I heard that the Alto systems had the capability to run both pdp11 and Nova code, but discussions I have heard since seeing one during an interview at XDS back in the 70's leads me to believe that was not the case. Jim