Is this - Im pretty sure its a DEC (says digital equipment corporation on the front in the picture,) does anyone happen to have one of these beauties? Know the specs, how you work with it? etc...
It's an original model PDP-8, also called a "Straight-8" (as opposed to an -8/S, -8/i, -8/L...)
Without any expansion, it's a 4Kword machine with, IIRC, a TTY interface, and that's it. There were a number of peripherals for it including fixed-head disks (the platter rotates just like a modern hard disk, but there are several dozen read/write heads that are bolted to the undercarriage) and random access tape (imagine a floppy disk with all the sectors lined up one after the other). You work with it the same way you work with later models - toggle in whole programs, or, when that gets tiring, a bootstrap to read in paper tapes or an operating system if you have disk or tape.
I happen to have two of these, but rack-mount, not the sexy desktop model in the picture. I also have some DF32 disk drives (the type mentioned above). Unfortunately, mine were used in a print shop and are covered with printers ink, so I have yet to power either of them up. I also have several examples of more modern PDP-8s that do work just fine.
The PDP-8 processor was sold, in one form or another, from the transistor era up through VLSI microprocessors (Intersil/Harris IM-6120), spanning about 30 years from about 1964 to 1994 (Straight-8 through DECmate III+). There was even a PDP-8 clone sold for a few years recently called the SBC-6120 (single-board computer w/IM-6120) with an optional front panel and rare FPGA-based I/O expansion board (IOB6120). The primary OS for machines with at least 8K and a random-access device is OS/8. AFAIK, as long as you have the required memory and disk/tape, OS/8 will run on all models of PDP-8 (the minor exception being console I/O differences with DECmates, requiring a slightly modified version called OS/78 or OS/278). I've never tried running OS/8 on anything older than a PDP-8/e, but only because none of my older machines have enough memory or have a disk.
There's something striking about the old modular CPUs, though. I first ran across one at age 16, a PDP-8/L, which I still have and still works. It's about the same speed and capacity of the Straight-8, but since it's TTL-based, not transistor-based, is about 1/4 the volume (and a lot fewer amps to run).