Complex sentence: The TMS9900 processor's instruction set did not suffer from little endianness and was "clean", i.e. all illegal opcodes executed as a NOP, and did not produce spurious/unexpected execution results.
Split into simpler sentences: The TMS9900 processor's instruction set did not suffer from little endianness and was "clean". All illegal_opcodes executed as a NOP, and did not produce spurious/unexpected execution results.