The two big waferscale efforts of the 1980s were by Gene Amdahl and Clive Sinclair. Amdahl did run into technical problems connecting multiple wafers to build

The two big waferscale efforts of the 1980s were by Gene Amdahl and Clive Sinclair. Amdahl did run into technical problems connecting multiple wafers to build mainframes and using lasers to swap out bad subparts (both currently solved problems and normal industry practice). But in Sinclair's case investors pulled out despite technical success because hard disk prices started falling exponentially after having stayed stable for many years. The irony was that he had done the "silicon disk" waferscale RAM just to not scare of investors with his real goal of a manycore processor on a wafer.