Time for an update of my area, as I've at last finished re-wiring stuff to get the most out of it all:

Top row from left to right:
- Sun LSA800 18" 1280x1024 TFT
- Iiyama HM704UTC 17" Diamondtron CRT
- SGI 1600SW 18.1" 1600x1024 TFT with SGI Multilink adapter
Middle row (racks):
- Yamaha MU50EX GM/XG MIDI module
- Roland MT-32 (rev0) MIDI module
- Sun SPARCstation 20 (connected to LSA800)
- Edirol UM-550 MIDI patchbay
- Behringer Eurorack Pro 8 channel stereo mixer (connected to Microlab speakers)
- Aten CS-88A 8-port PS/2 KVM (connected to Iiyama HM704UTC)
- Microlab B73 stereo speakers
Front row (input devices):
- Sun Type 5 keyboard
- Sun Type 5 mouse
- Gravis GamePad Pro
- Gravis PC GamePad
- SGI Granite 'bigfoot' PS/2 keyboard (connected to KVM)
- IBM 13H6690 (late PS/2) mouse (connected to KVM)
- IBM Model M PS/2 keyboard
- Microsoft Trackball Explorer
Under the table:
- my son's K6-2 retro game box (connected to KVM, mixer and those Gravis GamePads)
- my 'service module' Phenom 2 X4 system connected to the SGI mulilink, IBM Model M, Trackball Explorer and second input on the Microlab speakers
The cables snaking behind the keyboards are a complete set of KVM, audio and MIDI for workbench use.
The rest of the room is a complete mess, but working on it 😉
Final goal is to have a set of drawers under the desk with six systems hooked up to the KVM. Possibly I'll reduce that to four to allow for a few separate cases. But for now, bedtime...
Edit: and in case you're wondering why I use the SGI keyboard with the Iiyama monitor (and IBM mouse) and the IBM keyboard with the SGI monitor. It's all about typing vs gaming. The Model M is still (one of) the best keyboard(s) ever for typing. However it has very limited 2KRO, which mean's it's useless for keyboard gaming. The Trackball Explorer and 1600SW are best in class peripherals to go with it. The SGI Granite Bigfoot doesn't come close to the Model M in terms of typing, but it's good enough, and though I doubt it has NKRO, it's certainly better in that sense than the Model M. And that IBM mouse? Er, I gave away my last decent PS/2 mouse and basically only do DOS gaming here, so this was good enough for now... crap though indeed.