alt.sys.perq has been known to
yield results...
You probably also want to take a look at R.D.Davis' PERQ page - the mirrored spheres image is impressive.
There are a number of FAQs on PERQ computers. These tend to concentrate on the PERQ-1 and 2, but they make interesting reading nonetheless:
Here's my own attempt to answer some questions about the (rare) PERQ 3: PERQ 3 Trivial FAQ.
You might want to learn the arcane ritual required to park the heads on the awe-inspiring 14" Shugart hard disk fitted to the PERQ 1...
The PERQ is soft-microcodable, so anybody can redefine or extend its instruction set if they wish. It supported bytecode interpretation in hardware long before Sun thought of Java... ARD12 (Tony Duell) wrote a three part "Introduction to Microcoding" which makes very interesting reading: here are parts one, two and three. You can also have a look at a piece of microcode I wrote, to implement a ROT13 opcode...
I have both a PERQ 1 and a PERQ 3. Both are described on my collection page. I've actually (15 years on!) updated the photographs I've taken of the PERQ 1, so they're much better quality.
The image at the top of this page is of a PERQ 1, from an advert in the July 1981 issue of Datamation; you can look at the advert in a big 1MB version, a medium 328K version or a smaller 90K version. The text is readable in all versions; you should note that it has at least one technical error, though [the writable control store is decidedly not optional...]
