Yeah, AMD was founded in 1969 and made some small scale processor chips around that time. It wasn't until 1975-76 that they wanted to go on par with Intel and they copied the 8080 chipset and then branched off into the RISC market as it was believed that was the future of processors. It was a shift that never really took off so they went back to PC market to follow Intel in the x86 market. Obviously as seen in this MAC, the AMD chip was simply an embedded CCU (maybe a microsequencer/Bit slice?) and not the primary processor (Motorola 68000 was).