@gloriouscow.bsky.social
Developer of MartyPC - a cycle-accurate IBM PC/XT Emulator
https://github.com/dbalsom/martypc
and fluxfox - a PC floppy disk image library
https://github.com/dbalsom/fluxfox
Retro enthusiast and shameless computer geek
https://github.com/dbalsom/martypc
and fluxfox - a PC floppy disk image library
https://github.com/dbalsom/fluxfox
Retro enthusiast and shameless computer geek
November 10, 2025 at 10:08 PM
November 10, 2025 at 6:41 PM
From Infoworld, July 1983.
My guy generated SIX FEET of code. How many feet of code did you write today?
#retrocomputing
My guy generated SIX FEET of code. How many feet of code did you write today?
#retrocomputing
November 5, 2025 at 3:19 AM
From Infoworld, July 1983.
My guy generated SIX FEET of code. How many feet of code did you write today?
#retrocomputing
My guy generated SIX FEET of code. How many feet of code did you write today?
#retrocomputing
I've officially released my real-mode emulator CPU test suite for the Intel 80386.
github.com/singlestepte...
#retrocomputing #emulation
github.com/singlestepte...
#retrocomputing #emulation
November 4, 2025 at 8:16 PM
I've officially released my real-mode emulator CPU test suite for the Intel 80386.
github.com/singlestepte...
#retrocomputing #emulation
github.com/singlestepte...
#retrocomputing #emulation
Reposted
Disassembly (+ comments) of tape protection of Repton (Acorn Electron). Interesting protection measures. Hidden data in tape block headers is my favourite trick github.com/0xC0DE6502/t...
November 2, 2025 at 4:36 PM
Disassembly (+ comments) of tape protection of Repton (Acorn Electron). Interesting protection measures. Hidden data in tape block headers is my favourite trick github.com/0xC0DE6502/t...
A rare example of Vault Corporation's "PROLOK" copy protection scheme on a 3.5" floppy disk.
Vault used some method - probably a laser - to remove the oxide coating from one side of the mylar disk, making it impossible to write to.
#retrocomputing
Vault used some method - probably a laser - to remove the oxide coating from one side of the mylar disk, making it impossible to write to.
#retrocomputing
November 1, 2025 at 8:29 PM
A rare example of Vault Corporation's "PROLOK" copy protection scheme on a 3.5" floppy disk.
Vault used some method - probably a laser - to remove the oxide coating from one side of the mylar disk, making it impossible to write to.
#retrocomputing
Vault used some method - probably a laser - to remove the oxide coating from one side of the mylar disk, making it impossible to write to.
#retrocomputing
Reposted
I used to watch/research up to 10 hours of video on YouTube every single day -- but I spent less than 10 hours doing it. I just released a video where I document all of my YouTube viewing speedhacks I've figured out over the years: youtu.be/B1yHK_nEKaM
How to Watch YouTube Smarter, Not Harder
YouTube video by Jim Leonard
youtu.be
October 25, 2025 at 6:06 PM
I used to watch/research up to 10 hours of video on YouTube every single day -- but I spent less than 10 hours doing it. I just released a video where I document all of my YouTube viewing speedhacks I've figured out over the years: youtu.be/B1yHK_nEKaM
Before I got deep into the retro computing hobby, I dabbled in watercolors.
My art desk is now an electronics workstation cluttered with equipment and various Arduino projects.
I kinda miss painting though. I wish I had the space to have both hobbies.
#watercolor
My art desk is now an electronics workstation cluttered with equipment and various Arduino projects.
I kinda miss painting though. I wish I had the space to have both hobbies.
#watercolor
October 27, 2025 at 4:34 PM
Before I got deep into the retro computing hobby, I dabbled in watercolors.
My art desk is now an electronics workstation cluttered with equipment and various Arduino projects.
I kinda miss painting though. I wish I had the space to have both hobbies.
#watercolor
My art desk is now an electronics workstation cluttered with equipment and various Arduino projects.
I kinda miss painting though. I wish I had the space to have both hobbies.
#watercolor
made a lil mascot for my MOO-format for emulator CPU tests
i've always done pixel art in photoshop but maybe i should try aseprite someday
i've always done pixel art in photoshop but maybe i should try aseprite someday
October 25, 2025 at 4:38 PM
made a lil mascot for my MOO-format for emulator CPU tests
i've always done pixel art in photoshop but maybe i should try aseprite someday
i've always done pixel art in photoshop but maybe i should try aseprite someday
Reposted
I recently did an interview for EX! Magazine, published by Adventurous Music. I talk about art, music, tech, and privacy/security in the age of authoritarianism. It's packaged with some great music by great artists too!
📖 PRE-ORDER → adventurousmusic.bandcamp.com/album/ex-zin...
📖 PRE-ORDER → adventurousmusic.bandcamp.com/album/ex-zin...
October 23, 2025 at 3:44 PM
I recently did an interview for EX! Magazine, published by Adventurous Music. I talk about art, music, tech, and privacy/security in the age of authoritarianism. It's packaged with some great music by great artists too!
📖 PRE-ORDER → adventurousmusic.bandcamp.com/album/ex-zin...
📖 PRE-ORDER → adventurousmusic.bandcamp.com/album/ex-zin...
@davidxnewton.bsky.social
i recently found some assets from a DOOM TC I started (and never had a hope of finishing) sometime in 1995
LION KING DOOM
i recently found some assets from a DOOM TC I started (and never had a hope of finishing) sometime in 1995
LION KING DOOM
October 23, 2025 at 3:22 AM
@davidxnewton.bsky.social
i recently found some assets from a DOOM TC I started (and never had a hope of finishing) sometime in 1995
LION KING DOOM
i recently found some assets from a DOOM TC I started (and never had a hope of finishing) sometime in 1995
LION KING DOOM
thank you cyberpower for logging UPS stats every 3 seconds since the dawn of time
October 23, 2025 at 12:54 AM
thank you cyberpower for logging UPS stats every 3 seconds since the dawn of time
Reposted
This CrowdSupply item - the ESP32JTAG - just went live, and it has a lot more functionality than I thought it would when I first heard about it.
Impressive.
Also, 40% of the way to its target, and it only started a few hours ago.
www.crowdsupply.com/ez32/esp32jtag
Impressive.
Also, 40% of the way to its target, and it only started a few hours ago.
www.crowdsupply.com/ez32/esp32jtag
ESP32JTAG
A multifunction, wireless JTAG tool powered by an ESP32 and an FPGA
www.crowdsupply.com
October 21, 2025 at 10:01 PM
This CrowdSupply item - the ESP32JTAG - just went live, and it has a lot more functionality than I thought it would when I first heard about it.
Impressive.
Also, 40% of the way to its target, and it only started a few hours ago.
www.crowdsupply.com/ez32/esp32jtag
Impressive.
Also, 40% of the way to its target, and it only started a few hours ago.
www.crowdsupply.com/ez32/esp32jtag
Reposted
I take no credit.
Amazed someone took the time to do this.
October 21, 2025 at 6:25 PM
I take no credit.
Reposted
I've now submitted my entry for the #DOSember Game Jam 2025. I've ported my Psion & ZX Spectrum game #Barbarians to #dos, as usual aimed at the original #ibmpc with #cga graphics. Download it from cyningstan.itch.io/barbarians-dos
Barbarians (DOS) by Cyningstan
A strategy game for MS-DOS
cyningstan.itch.io
October 18, 2025 at 7:30 PM
I've now submitted my entry for the #DOSember Game Jam 2025. I've ported my Psion & ZX Spectrum game #Barbarians to #dos, as usual aimed at the original #ibmpc with #cga graphics. Download it from cyningstan.itch.io/barbarians-dos
Calling for help from the #retrocomputing community!
Help us verify extraction of the Intel 8087 Microcode ROM!
8087.martypc.net
Help us verify extraction of the Intel 8087 Microcode ROM!
8087.martypc.net
Microcode Deep-Zoom Viewer
8087.martypc.net
October 18, 2025 at 9:24 PM
Calling for help from the #retrocomputing community!
Help us verify extraction of the Intel 8087 Microcode ROM!
8087.martypc.net
Help us verify extraction of the Intel 8087 Microcode ROM!
8087.martypc.net
Reposted
Added a bunch of my old vic-20 demoscene sourcecode onto itch. 4mat.itch.io/music-drivers
vic-20 demo showreel
YouTube video by 4mat
www.youtube.com
October 17, 2025 at 3:28 PM
Added a bunch of my old vic-20 demoscene sourcecode onto itch. 4mat.itch.io/music-drivers
Reposted
I’ll be here talking about making games for retro machines alongside other better game developers www.computinghistory.org.uk/det/74558/Re...
Also lots of very cool #RetroComputing and #RetroGaming collections
Also lots of very cool #RetroComputing and #RetroGaming collections
Retro Computer Festival 2025 (Gaming Edition) - Saturday 15th November - Event Ticket - Computing History
Click here for information on Sunday Were very happy to announce our 2025 Retro Computer Festival and this time with a twist.Click here for information on Sunday We're very happy to announce our 20...
www.computinghistory.org.uk
October 16, 2025 at 4:59 PM
I’ll be here talking about making games for retro machines alongside other better game developers www.computinghistory.org.uk/det/74558/Re...
Also lots of very cool #RetroComputing and #RetroGaming collections
Also lots of very cool #RetroComputing and #RetroGaming collections
Reposted
I Have No Mouth, and I Must Scream has been updated on Steam and GOG for PC, Mac, and Linux with added achievements, soundtrack, cloud saves, and more! 😱
📜 Patch Notes: nightdivestudios.com/i-have-no-mo...
📜 Patch Notes: nightdivestudios.com/i-have-no-mo...
October 16, 2025 at 5:22 PM
I Have No Mouth, and I Must Scream has been updated on Steam and GOG for PC, Mac, and Linux with added achievements, soundtrack, cloud saves, and more! 😱
📜 Patch Notes: nightdivestudios.com/i-have-no-mo...
📜 Patch Notes: nightdivestudios.com/i-have-no-mo...
Reposted
My humble (if cluttered) workbench. This is my cozy place!
October 14, 2025 at 8:11 PM
My humble (if cluttered) workbench. This is my cozy place!
Take a deep dive into the NEC V20 CPU die at 5 gigapixel resolution, thanks to oldbytes.space/@infosecdj@i...
siliconprawn.org/map/sharp/lh...
#retrocomputing
siliconprawn.org/map/sharp/lh...
#retrocomputing
October 14, 2025 at 4:48 PM
Take a deep dive into the NEC V20 CPU die at 5 gigapixel resolution, thanks to oldbytes.space/@infosecdj@i...
siliconprawn.org/map/sharp/lh...
#retrocomputing
siliconprawn.org/map/sharp/lh...
#retrocomputing
I've decoded the NEC V20's group decode PLA.
This PLA takes an 8-bit opcode (and two mode signals) as inputs and produces 14 status outputs that control operation of the CPU.
These status signals will hopefully explain some gaps in functionality that the microcode doesn't cover.
#retrocomputing
This PLA takes an 8-bit opcode (and two mode signals) as inputs and produces 14 status outputs that control operation of the CPU.
These status signals will hopefully explain some gaps in functionality that the microcode doesn't cover.
#retrocomputing
October 13, 2025 at 3:43 PM
I've decoded the NEC V20's group decode PLA.
This PLA takes an 8-bit opcode (and two mode signals) as inputs and produces 14 status outputs that control operation of the CPU.
These status signals will hopefully explain some gaps in functionality that the microcode doesn't cover.
#retrocomputing
This PLA takes an 8-bit opcode (and two mode signals) as inputs and produces 14 status outputs that control operation of the CPU.
These status signals will hopefully explain some gaps in functionality that the microcode doesn't cover.
#retrocomputing
Reposted
The latest version of the Taito F2 core fixes the shadows in PuLiRuLa so they "shimmer" like you see in the video. The shadows are just the character sprites drawn with a black color palette and scaled down vertically. So what makes them shimmer?
October 12, 2025 at 3:31 PM
The latest version of the Taito F2 core fixes the shadows in PuLiRuLa so they "shimmer" like you see in the video. The shadows are just the character sprites drawn with a black color palette and scaled down vertically. So what makes them shimmer?
Here's a visualization of the NEC V20 microcode showing how the microcode is organized into logical sections. Over half of it implements the 8088 ISA, with many of the internal functions implementing common routines for division, multiplication and string operations.
#retrocomputing
#retrocomputing
October 11, 2025 at 1:06 AM
Here's a visualization of the NEC V20 microcode showing how the microcode is organized into logical sections. Over half of it implements the 8088 ISA, with many of the internal functions implementing common routines for division, multiplication and string operations.
#retrocomputing
#retrocomputing
I've made some progress decoding the NEC V20 microcode.
I'll be updating this thread on VCF:
forum.vcfed.org/index.php?th...
If you feel like helping out, check out the attached spreadsheet and see if you can identify any of the unidentified source/destination addresses. #retrocomputing #emulation
I'll be updating this thread on VCF:
forum.vcfed.org/index.php?th...
If you feel like helping out, check out the attached spreadsheet and see if you can identify any of the unidentified source/destination addresses. #retrocomputing #emulation
The NEC V20 Microcode ROM
I commissioned a decap and imaging of the NEC V20 at a sufficient resolution to extract the microcode ROM contents.
This was performed by InfoSecDJ
A convolutional neural network was used to extrac...
forum.vcfed.org
October 7, 2025 at 11:36 PM
I've made some progress decoding the NEC V20 microcode.
I'll be updating this thread on VCF:
forum.vcfed.org/index.php?th...
If you feel like helping out, check out the attached spreadsheet and see if you can identify any of the unidentified source/destination addresses. #retrocomputing #emulation
I'll be updating this thread on VCF:
forum.vcfed.org/index.php?th...
If you feel like helping out, check out the attached spreadsheet and see if you can identify any of the unidentified source/destination addresses. #retrocomputing #emulation