Yep, I know the unofficial intructions as 'illegal opcodes'. They even may vary inside the processor series, so it <could> be possible that programs using them run one one computer but not on another. But C64 software is very good programmed, there are nearly no compatibility problems although there were at least 5 board revisions and 2 revisions of the C128 (which had an inbuilt C64-mode).

Don't know about the CD-I... I think it came st the same time as Commodore's CD32 which already had a 32bit-68EC020 and the Amiga AGA chipset. But it wasn't able to play video CDs like the CD-I, only with an external module. It was the first 32bit video game console on the market (the most people don't know this) and was fully upgradeable to a real Amiga, that was the main advantage. I still preferred the CDTV, it was fantastic... I still have two, with SCSI-controller, black keyboard and infrared mouse. But the CDTV came too early - the people had no idea what do with a remote-controlled computer containing a CD-ROM which should be placed into the living-room... nowadays everyone wants to do this. But the hardware was really criminal. The single-speed caddy CD-ROM was a complete CD-Player, with components from Technics on it. You could play CDs with it even when the 68000 was removed, crazy. A friend developed hardware for the CDTV, I often heard his curses about that thing

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2 Opteron systems: OSx86 10.5.8, Andy's 9.8.0 kernel, Asus A8N-SLI Premium, Opteron 185 o'clocked @ 2 x 2,95 GHz (2nd system 2.6 GHz), ATI Radeon HD2600XT 256MB Dual-Monitor 2x HP L2035, 4 GB RAM, Griffin FireWave as main audio device, Marvell + nForce LAN, Asus U3S6 USB3/SATA6 card, 5,5 TB harddisk, Firewire 800 card, Apple Remote + eHome IR receiver, 2x Wacom serial graphics tablet, Canon Pixma iP4700, Logitech Internet Navigator wireless keyboard/mouse combination.

My Audio stuff: M-Audio Transit USB (default audio), M-Audio ProFire 610, M-Audio ProFire Lightbridge (34 channels) using Creamware A16 ADAT converter • MIDI: M-Audio Midiman 4x MIDI interface • Behringer Audio Mixers: Xenyx 1002, Xenyx 1002FX, Xenyx 1202FX, Eurorack UB1002FX, Eurorack MX1804FX, Eurorack MX262A • FX devices: Lexicon MPX100 DSP, Behringer DSP-1000 Virtualizer, Behringer MiniFEX 800 DSP, Behringer Multicom Pro MDX4400 compressor • RETRO: MSSIAH midi/sequencer/synthesizer cardridge for the C64 (Dual-SID), Steinberg M.S.I. MIDI Interface for C64