TFW you want to work on SGI emulation in MAME, but you feel like you're letting down some folks by not working on emulating the Quantel Paintbox, and other folks by not working on emulating the copy-protection MCU on a series of Austrian quiz games that ran on the Philips CD-i...
Even better, I just forgot to back up error.log before restarting MAME. That log file may have contained important info as to why the VINO (Video In, No Out) chip isn't being properly detected. Time to spend another hour and a half installing IRIX 5.3!