Your bike is a Shogun CrMo 500. I know because I have one!

It's all original from what I can see (aside from the ugly red bar tape and the ridiculous Haro stickers plastered on it). The stickers cover the name of the bike (Shogun CrMo 500). It's got nice, lugged Tange Champion chromoly steel tubing and solid mid-range touring drivetrain (Deore before it became mountain bike gear). Mine rides great and looks retro-cool. It's my only road bike. I picked it up for peanuts thinking I would get a "real bike" later on, but damm, I really fell in love with the thing and saw no need to replace it. The triple is a godsend on the absurd hills we have here in the Finger Lakes region of upstate NY. It's reasonably light (maybe 25 pounds or so), has strong high-spoke-count wheels, comfortable touring geometry, and solid components. The friction shifting never needs to be adjusted or tuned - this simplicity is wonderful once you get used downtube shifters.

Here's my own Shogun (pic below). I replaced the stem with a much longer one (it was an absurdly short 60mm or so) and put some wider bars on it (44 cm to replace the really narrow 39 cm bars on it originally). I also put a "new" road bike seat on it (was originally from a friend's Trek 1200). Everything else, even the gumwall tires, are original. Don't worry, I replaced the tires soon after this pic, more out of caution than anything. About $50 total for all upgrades, including the new tires, and I had a fine road bike for myself.

As with my bike, the drivetrain of yours looks to be in great shape. Those cranks are made of tough-wearing steel, not aluminum (it's a sport tourer meant for durability). I'm certain that I've put more miles on my bike in the 6 months that I've owned it (about 1000 miles ) than the previous owner did in the 20 years he had it. I figure I'll get at least another 10,000 miles out of it before I have to replace anything aside from chains and tires. We will see...

I hope that helps!