I have made available an up-to-date version of ee9, my GNU Ada emulator of the historic English Electric KDF9, including a 32-bit binary compiled and tested on an RPi 400.
You can find it here:
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The package includes copies of the pioneering Whetstone and Kidsgrove ALGOL 60 compilers, as well as a couple of original application programs dating from the 1960s.