instruction: What are the stated main reasons the iAPX432 architecture failed?
output: The many features included resulted in a very complex processor that was difficult to manufacture. The complexity also resulted in a very slow and expensive processor which was not competitive in the market. The initial failure cast doubt on the entire approach taken to develop a new architecture, making further iterations to improve the processor more difficult.
input: Using the semiconductor technology of its day, Intel's engineers weren't able to translate the design into a very efficient first implementation. Along with the lack of optimization in a premature Ada compiler, this contributed to rather slow but expensive computer systems, performing typical benchmarks at roughly 1/4 the speed of the new 80286 chip at the same clock frequency (in early 1982). This initial performance gap to the rather low-profile and low-priced 8086 line was probably the main reason why Intel's plan to replace the latter (later known as x86) with the iAPX 432 failed. Although engineers saw ways to improve a next generation design, the iAPX 432 capability architecture had now started to be regarded more as an implementation overhead rather than as the simplifying support it was intended to be