David Youd
@c64cryptoboy.bsky.social
📤 250
📥 177
📝 190
Otrovert, 8-bit preservationist, and armchair ludomusicologist
https://www.youtube.com/@DavidYoud
10 days ago
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A cool project from
@mrdoornbos.bsky.social
imapenguin.com/2026/03/brea...
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Breaking Enigma with Index of Coincidence on a Commodore 64
Breaking Enigma without known plaintext using statistical analysis on the Commodore 64.
https://imapenguin.com/2026/03/breaking-enigma-with-index-of-coincidence-on-a-commodore-64/
28 days ago
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reposted by
David Youd
LaurieWired
about 1 month ago
How do you kill a Supercomputer?

 (Accidentally) using radioactive solder is a good way.

 IBM’s Blue Gene/L frequently crashed when running simulations at LLNL.

 Turned out that alpha particles from the lead solder in the board carrier were slamming the L1 cache with bit flips.
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My latest short:
youtube.com/shorts/kXzG7...
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What ears care about (it's not 256 Hz vs 261.63 Hz tuning)
YouTube video by David Youd
https://youtube.com/shorts/kXzG75KUXpo
2 months ago
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reposted by
David Youd
BastichB64K
2 months ago
Trying out this old keyboard peripheral on the
#C64ultimate
... Little bit of 'Sonic' from my daughter ❤️
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3 months ago
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www.dexerto.com/gta/this-sto...
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This store is giving away GTA 6 for free – if you have a baby on release day - Dexerto
A Norwegian electronics company is promising to give away free copies of GTA 6 to parents who manage to give birth on the day that the game releases.
https://www.dexerto.com/gta/this-store-is-giving-away-gta-6-for-free-if-you-have-a-baby-on-release-day-3317986/
3 months ago
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Some AI 8-bit reverse engineering
www.youtube.com/watch?v=sLWf...
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Can AI Find the RNG in Bard’s Tale (C64)?
YouTube video by David Youd
https://www.youtube.com/watch?v=sLWf4Xr3R-0
3 months ago
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Got a new toy today. :)
www.youtube.com/shorts/71jwc...
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Enigma machine replica reveals disappointing secret
YouTube video by David Youd
https://www.youtube.com/shorts/71jwcveC-8g
3 months ago
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reposted by
David Youd
Martin Piper
4 months ago
I look at
#Commodore64
demo "The Hat" by Fairlight and Genesis Project, specifically the part with the "14 balloon sprites" in a row and its "hires" scrolling border message.
youtu.be/DyteWLEPKzE
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C64 Demos peek - The Hat - Up, Up, and Away! - The balloons part
YouTube video by Martin Piper's mostly Commodore related memories
https://youtu.be/DyteWLEPKzE
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Online
#Zork
I through III, but with an
#LLM
that replaces the normal input parser:
infocom.tambo.co
For instance, I just typed a prompt, and it translated it into two zork commands:
4 months ago
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Remember having to swap disks all the time on 8-bit RPGs? Well, this 21-year-old beat the modern (2020) game Factorio, after converting the game to an unfathomable disk-swapping hell of over 1,000 floppies:
www.youtube.com/watch?v=cTPB...
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I beat Factorio on 1,000 Floppy disks.
YouTube video by DocJade
https://www.youtube.com/watch?v=cTPBGZcTRqo
4 months ago
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Of course, someone has already AI-
#MCP
-wrapped the new
#C64Ultimate
:
github.com/Martijn-DevR...
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GitHub - Martijn-DevRev/Ultimate64MCP: MCP server for the Ultimate 64 series mainboards and cartridges
MCP server for the Ultimate 64 series mainboards and cartridges - Martijn-DevRev/Ultimate64MCP
https://github.com/Martijn-DevRev/Ultimate64MCP
4 months ago
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A new 8K PET RPG:
youtu.be/dzSJlNHcFME
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Tower And Dragon 4.0 Trailer
YouTube video by Jason Cook
https://youtu.be/dzSJlNHcFME?si=JGy8g0UgbL9twojz
4 months ago
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An early
#Commdore
#PET
RPG worth exploring: Dragon’s Eye (
#EPYX
, 1981)
youtu.be/jJfGN4Zeb7M
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Dragon's Eye: Exploring an EPYX PET-Era RPG
YouTube video by David Youd
https://youtu.be/jJfGN4Zeb7M
5 months ago
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Another Christmas Gift, a new version of VICE just dropped:
vice-emu.sourceforge.io
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VICE - the Versatile Commodore Emulator
Homepage of VICE - the Versatile Commodore Emulator
https://vice-emu.sourceforge.io/
5 months ago
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New version of Retro Debugger just dropped today!
#c64
#reversing
github.com/slajerek/Ret...
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Release Retro Debugger v0.64.74 · slajerek/RetroDebugger
Retro Debugger v0.64.74 Bug fixed: VIC Display bitmap/text Y pixel line was off 1 pixel (thanks to Brush/Elysium for reporting) Bug fixed: VIC Editor screen may become blank when view is not displa...
https://github.com/slajerek/RetroDebugger/releases/tag/v0.64.74
5 months ago
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Just arrived!
5 months ago
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David Given uses
#ghidra
to explore a new 6502-based toy (bypassing some "security" in the process):
www.youtube.com/watch?v=jJ0X...
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Reverse engineering a 'tony' 6502-based game console
YouTube video by Poking Technology
https://www.youtube.com/watch?v=jJ0XmZvR4bU
6 months ago
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If you'd like to msg Becky Heineman, now is the time
add a skeleton here at some point
6 months ago
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It's
#CRX2025
(Commodore Retro eXpo) weekend! It's free to virtually attend. I'm unable to join this year, but they've got a great lineup:
#c64
www.crxevent.com/presenters.htm
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CRX EVENT
Website for Commodore Retro eXpo
https://www.crxevent.com/presenters.htm
6 months ago
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Michael Cranford's recent retrospective on developing The Bard's Tale (EA, 1985)
www.youtube.com/watch?v=oHc5...
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The History of “The Bard's Tale” by Michael Cranford - PRGE 2025 Portland Retro Gaming Expo
YouTube video by Portland Retro Gaming Expo
https://www.youtube.com/watch?v=oHc5NX5qNk0
6 months ago
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reposted by
David Youd
SmilaIcon64
7 months ago
VALE OF THE LOST GODDESS. Right that's all the location bitmaps done and first pass on all the sprites done too. Stu wrote me a quick editor so i could link up all the rooms and add little descriptions of what you see.
#c64
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Looked at that
#BardsTale
"IRKM DESMET DAEM" red herring again... Tried a running key cipher of two plain texts. C=(P1+P2)mod26 where "A"=0 to "Z"=25, so "Z"+"B"="A". Nothing plausible, but found fun nonsense: "IF GAZE PIECHART" + "A MEME A DEAR WANT" = "IRKM DESMET DAEM"
7 months ago
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Did a
#Halloween
3D-print last night (hollow-face
#illusion
)
www.youtube.com/shorts/uKcgI...
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Hollow-face illusion: "turns" to face you (ABS 3D-print)
YouTube video by David Youd
https://www.youtube.com/shorts/uKcgIdg9GbQ
7 months ago
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7 months ago
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www.scientificamerican.com/article/a-so...
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After 35 Years, a Solution to the CIA’s Kryptos Puzzle Has Been Found
After decades of speculation, two writers uncovered the answer to the Kryptos code’s final cipher
https://www.scientificamerican.com/article/a-solution-to-the-cias-kryptos-code-is-found-after-35-years/
7 months ago
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Visited both C.S. Lewis and J.R.R. Tolkien (in Oxford) today
7 months ago
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Planning my pilgrimage to The Cave (
@visitthecave.bsky.social
) and the Arcade Archive (
@arcadearchive.co.uk
) on the 18th. :)
7 months ago
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My laptop died prematurely. Time to say goodbye to all these awesome stickers:
8 months ago
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reposted by
David Youd
Rebecca Heineman
8 months ago
I’ve started a GoFundMe to help with my cancer battle
gofund.me/6850175a3
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Donate to Help Rebecca Ann Heineman Fight Aggressive Cancer, organized by Rebecca Heineman
I’m Rebecca Ann Heineman. The very first video game champion, creat… Rebecca Heineman needs your support for Help Rebecca Ann Heineman Fight Aggressive Cancer
https://gofund.me/6850175a3
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My buddy Jim Happel's latest gadget, the
#C64
#meshtastic
:
www.youtube.com/watch?v=7gDm...
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Meshtastic 64 Demo - meshtastic for the commodore 64
YouTube video by jim_64's 8-Bit Projects
https://www.youtube.com/watch?v=7gDmBlTKk90
8 months ago
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"Imaginary evil is romantic and varied; real evil is gloomy, monotonous, barren, boring. Imaginary good is boring; real good is always new, marvelous, intoxicating." -- Simone Weil
8 months ago
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Fun with my
#3dprinter
:
www.youtube.com/shorts/pLhZk...
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2-octave diatonic tapophone
YouTube video by David Youd
https://www.youtube.com/shorts/pLhZk9Y2nrM
9 months ago
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#LLMs
that play
#Infocom
games:
huggingface.co/blog/textque...
arxiv.org/pdf/2507.23701
github.com/centerforais...
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TextQuests: How Good are LLMs at Text-Based Video Games?
We’re on a journey to advance and democratize artificial intelligence through open source and open science.
https://huggingface.co/blog/textquests
9 months ago
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A new
#willywonka
DIY music box arrangement:
www.youtube.com/shorts/veMXU...
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Pure Imagination (Willy Wonka) music box
YouTube video by David Youd
https://www.youtube.com/shorts/veMXUNGMOjc
10 months ago
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Mail call:
10 months ago
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Got a new piece of art, a slow motion frame:
www.youtube.com/shorts/9m44t...
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Slow motion frame (#stroboscopic illusion)
YouTube video by David Youd
https://www.youtube.com/shorts/9m44tKfNucM
about 1 year ago
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A coder at microsoft made an AI app that provides real-time sports announcer commentary on pong games:
www.youtube.com/watch?v=i21w...
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I taught an AI to commentate Pong in Real Time
YouTube video by Parth Parikh
https://www.youtube.com/watch?v=i21wN6CDsE0&t=155s
about 1 year ago
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kudos
@burgerbecky.bsky.social
www.pcgamer.com/games/rpg/fa...
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Fallout 1 and 2's source code isn't lost after all, thanks to one hero programmer: 'I made it a quest to snapshot everything'
Rebecca Heineman, one of Interplay's founders, kept the receipts.
https://www.pcgamer.com/games/rpg/fallout-1-and-2s-source-code-isnt-lost-after-all-thanks-to-one-hero-programmer-i-made-it-a-quest-to-snapshot-everything/
about 1 year ago
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apologies to
#judyblume
about 1 year ago
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This guy sat with me for a while in my backyard while I was doing remote laptop work. Cooper’s hawk? Peregrine falcon? (
#BirdIdentification
in California East Bay area)
about 1 year ago
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Cleaning the house and found
#DisneyLand
blueprints (copies) I haven't seen in >20 years:
#HauntedMansion
and
#PiratesOfTheCaribbean
about 1 year ago
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Mail call:
#C64
#KungFuFlash
#Barbie
about 1 year ago
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Does anyone else get reviews left in their
#LittleFreeLibrary
? :D
@littlefreelibrary.bsky.social
about 1 year ago
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Saffron's
#mainecoon
ears
about 1 year ago
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reposted by
David Youd
Dan Luu
over 1 year ago
A version of Missile Command for the Commodore 64 where the bottom of your screen is the game state in memory and missiles cause memory corruption:
csdb.dk/release/?id=...
. In the video below, a missile broke my controls and caused my cursor to get stuck moving down and to the left.
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Remember when the
#Commodore
#PET
tried to hide code from you? Let's circumvent that PEEK restriction using only BASIC...
www.youtube.com/shorts/Ufj4N...
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Defeating Commodore's PET BASIC v1 PEEK protection, using BASIC
YouTube video by David Youd
https://www.youtube.com/shorts/Ufj4NxMP7t4
about 1 year ago
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The best portion of a good man's life is his little, nameless, unremembered acts of kindness and of love. -- William Wordsworth (1770-1850)
about 1 year ago
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Coding in the redwoods <3
about 1 year ago
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