One of my stranger hobbies is collecting old, interesting computer hardware. Back during the dot-com bust, I decided to focus my attention on workstation in the older sense of the word (desktop & similar-sized machines running some version of Unix or another multiuser non-consumer OS).

I decided to set out to try to get at least one example of each major RISC processor architecture, plus a few notable extras. I have yet to succeed, but I'm working on it. Many of these machines were picked up very, very cheap on eBay (plus a few hand me downs) and I was only able to test a few of them for lack of drives or appropriate cabling and keyboards.

Maybe when I retire, I'll do a better job of cataloguing them along with photos and links to sites with useful information on each architecture. Until then, this is probably not going to be updated much if at all./p>

What I've got, by processor

Sparc:

• 32-bit Sparc: SparcStation 20 with SuperSparc dual processors (SM61/60mhz I think) 224mb of RAM, one 18gb hard drive.
  For a while I had 150mhz Ross Hypersparc (RT626) processors, but it ran too hot; I'm pretty sure I sold them.
  Unlike literally every other machine here, I actually used this for a while as my home server while in graduate school.
• 64-bit Sparc:
• Sun Ultra5 with a 270mhz UltraSparc (IIi?) procesor, 256mb of ram, and 4gb disk (annoyingly IDE though I believe that's standard for Ultra5s)
  This was an actual working system, but by the time I got it there wasn't much use for it.
• Sun Ultra60: this was a hand-me-down and I've never so much as tried to power it up. It's a cool big hunk of machine.
• I had a "lunchbox" SUN machine briefly; it was a cheap eBay find, but didn't work. I don't remember if it was an IPC or an IPX.

MIPS:

• Little-endian: Two DEC Decstation 5000/200 (33mhz R3000, IIRC) each with an unknown amount of memory, no hard drives, and no keyboard/mouse. One has two frambuffers, the other has one. Neither is tested yet; I wrote in 2009 "and probably won't be - I never got a 3W3-to-BNC cable" - I since got one, but never got around to testing these.
  
• Big-endian:
• SGI Indigo2 (175mhz R4400, IIRC) with an unknown amount of memory and two hard drives of unknown size (2gb and 1gb?). Uses standard PC keyboards and mice, and I have a matching SGI monitor (17" 13w3 cable, Sync-on-green so it won't work with SUNs) [still have the Indigo; no idea what happened to the monitor.].
• SGI O2: another hand-me-down. Doesn't power on, but like the Ultra 60, it's big (and cooler looking).

PA-RISC:

• HP 712/100 -- I'm not sure what's in this one, but it's got memory and a hard drive
• HP C110 -- 120mhz processor, 256mb RAM, not sure of the HD size.
  These use standard PC keyboars and mice; the 712 came with an HP Internet keyboard, clearly not the original (recycled from one of their consumer PCs, most likely) that for a while I used as my main keyboard.

VAX:
Vaxstation 4000/60 with 96mb of ram and a 245mb HD (which will likely get replaced with a 1gb or 2gb) [nope, it won't!]
OK, VAX isn't RISC but it's a significant architecture nonetheless, and they defintely were workstations with a choice of VMS or Ultrix.

POWER (IBM RS/6000):

• Powerstation 340 (model 7012) -- I'm pretty sure this is original POWER, not POWER2. It's got two big ram boards, and two very chunky-looking (and probably low-capacity) narrow SCSI hard drives [or maybe they're old enough to be ESDI?]
  
• I have a pair of ~2006-vintage Power p5 servers that a former employer was throwing out in 2014. I have no idea what's in them.

Dec Alpha(Late addition, around 2005)
- Alphastation 250 (PCI, 266mhz, I think)
- Alphastation 255 (PCI, 300mhz, I think)

Non-Unix Micros

• Amiga 2000 (recent-ish purchase, untested.)
• Commodore 128D
• 2 Commodore 64's
• Commodore VIC-20
• 2 Commodore 1541 disk drives
• 2 Commodore 1581 disk drives (yes, the 3.5" drive for the 64/128)
• TI-99/4a
• 2x Timex-Sinclair 1000 (I don't think either works)
• Epson PX-8 Geneva laptop
  Working, albeit missing a couple of keys; at some point I will do a better job of writing up the NiMH battery hack, but to sum up, it runs quite happily on 4x NiMH AAA batteries (or 8x with 4S2P) and the connector is a very standard one for old cordless telephones. You just have to charge the batteries externally.
• Macintosh LC II (unknown if working, no HD)
• PowerMac 7200 (unknown if working, no HD)
• PowerMac G5 M9748LL/A Dual CPU 512M (unknown if working; specs are from the ebay confirmation)
• iBook G4 (working when I got it ~2014ish, would need a new battery now)

Vintage PC hardware

• Leading Edge CPC-2308 (486DX2/66 - non-PCI - 8MB RAM - CF card as HDD, working)
• Gateway desktop 486DX2/66 (PCI, working; don't remember how much RAM)
• Compaq tower Pentium 3 500mhz I think (this is almost too new to be interesting)
• A bunch of old Toshiba laptops - 1910 [486SX], a Tecra 7xx Pentium, and at least one other. None work.
• Gateway 486SX laptop [amazingly, works. still has a hard drive and WP5 on it]
• Two early-2000s Shuttle XPC systems, one with a Pentium 4 and one with an AMD chip [don't remember if it's Athlon XP or 1st-gen Athlon 64] - neither works.

Gone but not forgotten

The following machines have graced my collection but have either disappeared, or were given away in verious rounds of coerced housecleaning:

• DEC Vaxstation 2000
• AT&T 3B2/300 (/310?)
• Sun 3 (of unknown vintage, it was quite dead.)
• Sequoia Chameleon (MSDOS, but not PC, compatible, with an additional 8085 to run CP/M)
• Commodore Amiga 500
• 1st-gen Atari ST (520ST? 1040ST? I can no longer recall)
• Apple II+ (hand me down all the way back in high school)
• Several other Macs at different times.
• IBM PS/2 Model 50

What I still want:
A 680x0 based workstation -- a Sun3, probably, though there were a fair number of other manufacturers making 68k based workstations as well
On the 8-bit side, given the wonderful emultators available for most 8-bit architectures, it just doesn't seem quite as interesting to collect anymore. I'd still love to have a working Apple II (perhaps a IIgs or a Laser 128) and some kind of Atari 8-bit machine