Correct, although I can't be sure I'm remembering the names of the parts correctly. Soltis's book Inside the AS/400 https://archive.org/details/insideas4000000

Correct, although I can't be sure I'm remembering the names of the parts correctly. Soltis's book Inside the AS/400 https://archive.org/details/insideas4000000solt https://archive.org/details/insideas4000000solt is fascinating reading, but the title overpromises rather badly; there is no list of opcodes, for example.