Have you ever heard of the Encore 91 computer system, developed and built by Encore Computer Corporation? An old website from what appears to be a reseller of the Encore 91 has a detailed description and sales pitch of the machine still online, and it’s a great read. The hardware architecture of the Encore 91 series is based on the Motorola high-performance 88100 25MHz RISC processor. ↫ Encore computing 91 systemThe Encore 91 ran a combination of AT&T’s system V.3.2 UNIX and Encore’s POSIX-compliant MicroMPX real-time kernel, and would be followed by machines with more powerful processors in the 88xxx series, as well as machines based on the Alpha architecture. The company also created and sold its own modified RISC architecture, RSX, for which there are still some details available online.