I've had an IBM 9404 B-10 for some time and I'm curious about its assembly language. I'm fully aware the AS lines were designed with portability in mind as much IBM didn't seem to provide assembly language references as they did with the S/36 and S/38. I've searched for some time but couldn't find it even in archive.org.
Therefore, I would like to ask if someone had some sort of reference about its opcodes and mnemonics, as well as basic program structure.