There is no ALU chip. Or rather, there is; it’s just that an entire RISC CPU is implemented in basic logic chips and a whole lot of microcode on the ROM. It’s weird, yes, but it is cool.

The FPS6 is a modern processor with a high throughput RISC core coupled with a floating point ALU to boost performance. It has a full Harvard architecture. The instructions are 16 bits in length, with ...