Mark Moxon
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markmoxon.bsky.social
Mark Moxon
@markmoxon.bsky.social
Writer, walker, software archaeologist. Back in the day: Editor of Acorn User, Editor of h2g2.

I love analysing old code, and my aim is to create the best code disassemblies you have ever seen.

Purveyor of Elite/Lander/Revs hacks.

www.markmoxon.com
You didn't know you needed this in your life, but you do.

Marine Beaufils is a French artist who creates beautiful embroideries of... The Sentinel (amongst others).

It's inspired and quite beautiful. Enjoy!

www.marine.st/en/pages/sen...

#bbcmicro #zxspectrum #c64 #retrogaming #retrocomputing
January 13, 2026 at 11:42 AM
Have you ever wondered how big the full landscape is in The Sentinel?

It's 1856 pixels high and 2048 pixels wide.

Here's the first level. The initial 192x160 screen is in red. Panning jumps the view to different grid points.

It's a big old world!

#retrocomputing #retrogaming #bbcmicro #c64 #8bit
January 10, 2026 at 5:10 PM
I've just released fully documented source code for The Sentinel as an easy-to-browse website.

It's a lot more fun to explore than the GitHub repository, with cross-references, popups, indexes, statistics and more.

Enjoy!

thesentinel.bbcelite.com

#retrocomputing #retrogaming #bbcmicro #c64 #8bit
Fully documented source code for The Sentinel on the BBC Micro
Fully documented source code disassembly for The Sentinel on the BBC Micro, with lots of deep dive articles explaining how every aspect of the game works.
thesentinel.bbcelite.com
January 7, 2026 at 3:58 PM
I am delighted to announce the release of my latest project:

Fully documented source code for The Sentinel, Geoff Crammond’s 1986 masterpiece.

Here’s the repository; deep dives coming soon.

See thread for details.

1/9

github.com/markmoxon/th...

#retrocomputing #retrogaming #bbcmicro #c64 #8bit
GitHub - markmoxon/the-sentinel-source-code-bbc-micro: Fully documented and annotated source code for The Sentinel on the BBC Micro
Fully documented and annotated source code for The Sentinel on the BBC Micro - markmoxon/the-sentinel-source-code-bbc-micro
github.com
January 2, 2026 at 4:29 PM
I'm hoping to release my latest ultra-comprehensive gold-standard 6502 disassembly in the next few days.

It's been four months in the making and is almost complete.

Elite, Aviator, Revs, Lander… and now this.

Let the countdown begin: 🤖🪨🌲

#retrocomputing #retrogaming #bbcmicro #commodore64 #8bit
December 29, 2025 at 7:08 PM
Oh wow! Well that’s made my day. 😀

Thanks for letting me know. And thanks to @frontierastro.bsky.social for catching Mr Braben’s eye. It’s nice to be noticed! 🫡

More about flicker-free #Elite on my site:

elite.bbcelite.com/hacks/flicke...

#commodore64 #retrogaming #retrocomputing #bbcmicro #8bit
David tweeted about your work :)
November 21, 2025 at 9:41 AM
Some projects just take a long time to work through. I mean, I’ve got to make sure it can stand alongside the others.

It should be worth the wait, though.

#8bit #bbcmicro #disassembly
November 19, 2025 at 7:26 PM
I've finally finished pimping my David Braben-signed BBC Micro B+, and it can now run more variants of Bell & Braben Elite than any other contemporary machine ever.

The #BBCMicro B+ is officially the Commander-in-Chief of #8bit #Elite. 🫡

See thread for details.

(1/8)

#retrogaming #retrocomputing
November 5, 2025 at 7:42 PM
I've just released the Elite Compendium Addendum for the BBC Micro B+.

It contains two bonus versions of Elite for lucky owners of the B+, including musical BBC Master Elite for the B+128.

See elite.bbcelite.com/hacks/elite_... for details.

#retrogaming #retrocomputing #bbcmicro #8bit #elite
Elite Compendium - Elite on the 6502
Details of the Elite Compendium, which brings all the best Elite hacks together in one feature-packed disc
elite.bbcelite.com
August 31, 2025 at 6:16 PM
I'm pleased to announce the #Elite Compendium for the #Acorn #Electron, containing three amazing hacked versions of Elite on one disc.

It includes a brand new version: musical Elite. On the Electron!

Lots of details here: elite.bbcelite.com/hacks/elite_...

#retrogaming #retrocomputing #bbcmicro
August 20, 2025 at 12:26 PM
The incomparable @negativecharge.bsky.social recently converted the Commodore 64 Elite music to the Electron.

I've finally found time to add it to Electron Elite.

Here's the docking computer in all its one-channel glory.

Turn your sound on!

#retrocomputing #retrogaming #electron #bbcmicro #8bit
August 13, 2025 at 1:08 PM
Look at this little beauty! It's my new BBC Micro B+, signed by David Braben himself, and it’s the inspiration for my latest project:

"BBC Master Elite, backported to run on the unexpanded B+, and with lots of extra features"

Links in thread.

#retrocomputing #retrogaming #bbcmicro #8bit #elite
August 6, 2025 at 12:12 PM
My new project is a version of BBC Master Elite, but with a twist.

Sure, it’s pretty niche, but this has never been done before, which is always fun.

Can you tell what it is yet? The clue's in the clip...

#retrocomputing #retrogaming #bbcmicro #8bit #elite
July 25, 2025 at 1:34 PM
It's done! I have just released the Compendium version of #Elite for the #Acorn #Electron.

This massively enhanced version of the original game contains pretty much every feature of #BBCMicro Elite, but on the Electron. Just add 16K of sideways RAM.

Links in thread.

#retrocomputing #retrogaming
July 10, 2025 at 3:58 PM
Today's addition to #Acorn #Electron #Elite is the energy bomb animation from the Apple II, BBC Master and NES.

In the original Electron version, the energy bomb did little more than beep gently. Now it rages with lightning bolts! That's much better.

#retrogaming #retrocomputing #8bit #bbcmicro
July 6, 2025 at 1:01 PM
The Compendium version of #Acorn #Electron #Elite now has missions - three of them, in fact.

Here's the briefing for the Constrictor mission, backported from the #BBCMicro; I've also ported the Thargoid plans mission, and the Trumbles from the #C64 and #NES. 🫡

#retrocomputing #retrogaming #8bit
July 5, 2025 at 12:26 PM
My new version of #Acorn #Electron #Elite is feature-complete! Now for some testing.

Here's the feature list. It’s big! Big enough that this is effectively a Compendium version of Electron Elite; to sit proudly alongside the #BBCMicro Compendia. 🫡

Not long now!

#retrogaming #retrocomputing #8bit
July 4, 2025 at 6:55 PM
The enhanced version of #Acorn #Electron #Elite continues to grow. I've now added the ship hangar, which gets shown when you dock.

This feature was only in the BBC and NES versions, and not the Commodore 64 or Apple II, so that's a one-up for the Elk. 🫡

#retrogaming #retrocomputing #8bit
July 4, 2025 at 2:06 PM
It's #Thargoids Thursday in the enhanced version of #Acorn #Electron #Elite.

Here's me misjumping into witchspace and being ambushed by Thargoid motherships and their Thargon drones.

Electron commanders can now join in the bug-hunt - at last!

#retrogaming #retrocomputing #bbcmicro #8bit
July 3, 2025 at 11:10 AM
Enhanced #Elite on the #Acorn #Electron now has 31 different ship types (compared to just 11 in the original).

Here's a little clip showing an encounter with a Krait and a Mamba on the way to the sun.

Coming soon... Thargoids!

#retrogaming #retrocomputing #bbcmicro #8bit
July 2, 2025 at 1:56 PM
Enhanced #Elite on the #Acorn #Electron now has proper docking computers.

Good to see they're as nail-bitingly dodgy as all the other versions!

Next on the list is to add 21 additional ship designs with spawning and tactic logic. That might take a while...

#retrogaming #retrocomputing #bbcmicro
June 11, 2025 at 2:48 PM
Goodness gracious, great balls of fire!

(In enhanced #Acorn #Electron #Elite, that is.)

The speed isn't bad, considering the sun is probably the most screen-memory-intensive (i.e. slow) feature of #BBCMicro Elite.

More clips in thread. (1/3)

#retrocomputing #retrogaming #8bit
June 6, 2025 at 3:04 PM
On the left: original #Acorn #Electron #Elite.

On the right: Electron Elite using the #BBCMicro sun code to show variable sized stars on the system chart.

Now I just have to hook this up to the solar system, so Electron Elite can finally have suns and fuel scooping...

#retrogaming #retrocomputing
June 5, 2025 at 1:06 PM
#Elite on the #Acorn #Electron is slow - way slower than on the #Commodore64, for example.

But how does the enhanced 16K SRAM version cope?

Turns out enhanced Electron Elite is faster than the #C64! Sure, it can't compare on colour or music. But... result! 🚀

#retrogaming #retrocomputing #bbcelite
June 4, 2025 at 11:42 AM
Latest features in enhanced #Acorn #Electron #Elite:

* Proper disk access menu
* Military lasers
* Extended system descriptions (edible poets!)
* System search
* Planetary details (meridians/equators and craters)
* Fast, flicker-free graphics

Looking good!

#retrogaming #retrocomputing #bbcmicro
June 3, 2025 at 2:55 PM