The clarification about this not being the Matrix protocol really deserves to be at the top of the article, not a footnote.
Posts by Rob Kendrick
18 publicly visible posts • joined 23 Jan 2009
Eurocops take down 'secure' criminal chat system known as Matrix
Banks don’t give a 2FA
The Lloyds system is better
I have the 2FA device I have to use with HSBC/FirstDirect: it's a huge keyring thing that I never have near me when I use it.
The Lloyds system is far superior: doing anything that might cost you money makes a robot ring you on your mobile, which you're much more likely to have on you. You then type the number on-screen into your mobile, and you're done.
A much better balance of convenience vs. security.
SHA3-256 is quantum-proof, should last billions of years
Google's Page, LG boss's SECRET confab sparks Nexus 5 rumour
Revealed: The Brit-built GRAVITY-powered light that costs $5
Google puts Nexus 4 back on sale, sells out pronto
RISC OS comes to Raspberry Pi

MODE 7 is teletext mode, and I believe it works as it is a software emulation (and always has been in RISC OS; the BBC Micro had a hardware teletext chip.)
As for all your old games, they probably won't work: the ARM11 in the Raspberry Pi lacks the old 26 bit code addressing mode used by original Acorn systems and so only software patched or recompiled etc will function.
(Stuff in pure BBC Basic with no assembler will probably still work.)
Codethink jumps into the ARM server fray with Baserock Slab

If you're building software for ARM and you want to do it natively (lots of software can't be cross-built without significant misery), one of these things is going to be a hell of a lot quicker than using QEMU on an x86 box, not to mention smaller, less cabling, etc, and most likely cheaper, too.
It's ARM, so PXE doesn't make sense. But from the docs on on the Baserock website suggests you can "netboot" them from the management node: "The system management node manages the compute nodes, e.g. power up/down, reset, overall system monitoring and provisioning of images to the compute nodes"
El Reg in email address blunder
Which actor should play Steve in upcoming biopic?
Arcam Solo rDac wireless digital-to-analogue converter
Nvidia forges ARM chip for PCs and servers
Cambridge chap's todger topiary gets the chop
Waterfall Niagara speakers

25 grand, and no amplifcation? Pah.
You want a pair of Meridian DSP8000 loud speakers. Commonly considered to be the best on earth, they're around 30k per pair, but that includes DACs and amplification (they take digital in). All the magic's done in the digital domain for no loss. And they're made from cabinets that don't look like they'll vibrate, like glass.