This is "Jaws". That was the codename for the DEC J11, which is essentially a "PDP-11 on a chip". Jointly developed by DEC and Harris Semiconductor, it was the first PDP-11 CPU done in CMOS technology. The project aimed to pack the performance and features of the high-end PDP-11/70 into a compact chip set. It consisted of two separate dies: a data path chip and a control chip, mounted together on a single 60-pin ceramic hybrid DIP carrier. An optional floating-point accelerator (FPA) chip was also available. These are each entire hex BOARDS in my 11/44. Development began in the late 1970s/early 1980s (with Bob Supnik as early project leader), and the J-11 was introduced in late 1983 at 3.75 MHz. Speeds were later increased to around 4.5 MHz initially, with later variants and systems reaching up to 18–20 MHz by the early 1990s. I have an 18MHz on hand! The J-11 powered systems such as the PDP-11/73, PDP-11/83, PDP-11/93, and the Professional 380. It included advanced features like memory management, cache support, and most PDP-11/70 capabilities. As the last in DEC's line of PDP-11 microprocessors, it helped extend the long-lived 16-bit PDP-11 family into the mid-1980s and beyond, even as the company shifted focus to the VAX architecture. And its likely the prettiest chip I can think of!