light pen! light pen!

Update for “Opcodes” app is out! I fixed some missing 68000 instructions, improved the view on the iPad, and now you can paste in a string of hex digits to disassemble them in the scratchpad. apps.apple.com/us/app/opcod...

this was well timed

What's the worst time to post something gaming history related? A few days before GDC. Well, GDC is over, so I'll try again: Here's what I learned (as an archivist, for archivists) after listening to 150 episodes of the @gamehistoryorg.bsky.social podcast: trixter.oldskool.org/2026/03/05/s...

Check out my video on the FTG High Resolution Light Pen Interface Card, the PXL-380. Can it make the PC Light Pen ... not terrible? #retrocomputing www.youtube.com/watch?v=CnUJ...

Family portrait. #retrocomputing

This is a complete high-resolution light pen interface for the original IBM PC. #retrocomputing

Ok, this one was tougher than I expected. This week I worked on implementing the spear throw in-game. It turns out that doing it in 2.5d so that it looks decent is not that easy :D Also, you can have a peak of my first corporial enemy - the spider. #indiedev #gamedev #indiegame #survival #goth #hunt

Check out this rather colorful ad for some light pen software for the IBM PC from 1984 that was advertised as basically doing everything. #retrocomputing

Let's explore some software for the IBM PC Light Pen! youtu.be/iEIDSnuSWVM #retrocomputing

On April 1, 1963, Charles Tandy met Radio Shack's employees at the Ritz-Carlton in Boston. "I'm Charles Tandy from Fort Worth, Texas," he said to the group. "I now own Radio Shack." He paid $300,000. #retrocomputing #vintagecomputing dfarq.homeip.net/how-tandy-bo...

Using a Warp Speed light pen in "PC Illustrator 3" by Computer Graphics Group, Inc, on a Tandy 1000, with a CM-II monitor (in 2026) #retrocomputing #tandy1000 #lightpen

I have a cool perk dropping on April 1st (not a joke) via by Bandcamp Subscription... Now is a good time to subscribe 😎 yannnovak.bandcamp.com/subscription

A somewhat uncommon example of a light pen for the IBM CGA's light pen header. #retrocomputing

For those interested in preservation - Krugman here has been tirelessly dumping games basically nobody knows about, especially previously undumped eroge and adjacent games on PC98. He buys and repairs moldy discs to make it financially viable. It's a lot of work, so check out his stuff!

My hand-illustrated designs are #maker focused, including popular #retrocomputing boards or chips. Today I share the venerable #Z80. I made a few variations, too. What do you think? (hm, all three together looks cool, too)

I’m really enjoying Ars Technica’s “War Stories” from classic game developers. Here’s Jordan Mechner explaining how the game design of “Prince of Persia” was influenced by the Apple II’s memory limitations.

Comparing a cheap Commodore 64 light pen to my new, fancy Warp Speed Light Pen for the IBM PC. #retrocomputing youtube.com/watch?v=ojzv...

My hobbyist analog computer project coming along… The "strip chart" displays two voltages from the computer: an implementation of the Lotka–Volterra equation depicting prey population (red) & predator population (orange). (Red LED indicates overload.) #analogcomputing #analogcomputers #electronics

I don't follow the furry fandom that closely but apparently there is some controvery about knees

do you like chiptunes? do you like kraftwerk? 8bitoperators.bandcamp.com/album/the-mu...

The number of people laughing about 'helicopters on mars' when we have literally already flown a helicopter on mars is a bit concerning

Behold: The Tandy 1000 20MB Hard Disk System. #retrocomputing #tandy1000

Successfully updated my Tandy 1000 (the OG, not even A) to BIOS v1.01 with a OneROM Fire 28. #onerom #retrocomputing #tandy1000

I've updated my CGA digital logic simulation to v0.2 Graphics modes are now supported, and the CGA's hsync and vsync retiming circuits have been implementd. If you're on Windows you can download a portable distribution that you can just unzip and run. github.com/dbalsom/cga_... #retrocomputing

Commodore 64-versjon av The Secret of Monkey Island? Ja, takk!

Some unexpected finds at indyclassic.org today: an analog computer, and some NA demosceners.

Stranger things.

Reading some of the comments on @adriansdigitalbasement.com 's YouTube videos is maddening. The absolute, casual confidence people have posting 'corrections' while being completely wrong... It was half a century ago. You don't remember shit. I don't even remember what I had for lunch last week

Have a pixel art 8-bit CPU! #pixelart #z80 #retrocomputing

if you scan a 2 layer PCB on a flatbed scanner with a bright light source above it, it kinda looks like an X-ray. #retrocomputing

Any idea how the bus is managed between the 2 CPUs to avoid contention?

What do you do when you want to emulate a computer system that has no schematics and very little documentation? You just reverse-engineer the entire motherboard with KiCad, of course. This is the Seequa Chameleon, a dual-CPU IBM PC clone luggable machine from 1983. #retrocomputing #emulation

PALchemy: a new PAL dumping and chip analysis utility I'm working on. Interactively poke chip pins! All you need is a T48 USB programmer. #retrocomputing

Has @mcjonestech.com discovered a prototype motherboard for the unreleased Seequa Cobra computer? #retrocomputing oldbytes.space/@gloriouscow...

Well this is a nice surprise. A desktop Seequa board popped up on eBay this evening! It’s rough, and appears to have had chips blundered and of course no labeling to what was there originally. However, this is now definitive proof the XT and PC sold! #seequa #vintagecomputing

In 1980, Intel released the 8087 floating-point chip, making math much faster. I'm reverse-engineering this chip, 46 years later. Most of its instructions are implemented in microcode, but some are implemented in hardware. Let's look at the circuitry that decodes instructions and decides what to do.

New PicoIDE update is up! In which I enlist the help of @gloriouscow.bsky.social to understand the IBM PC/AT’s 16-bit bus when PicoIDE was acting strangely on mine www.crowdsupply.com/polpotronics...

Working on reproducing the schematics for the Seequa Chameleon - a quirky XT clone luggable machine. This is the largest KiCad project I've ever attempted - but I've learned a lot (keyboard shortcuts are your friend) and it is progressing rapidly. #retrocomputing

you ever see what happens if you connect a clock signal to one of the data pins of your VRAM? #retrocomputing

Today @sparkfun.bsky.social is dropping @adafruit.com over CoC violations, and what timeline even is this? www.sparkfun.com/official-res...

To get on the internet, you clicked on a trumpet

If you are interested in game preservation, arcade game history, or what could have been the first arcade rhythm game, you should watch Recovered Rhythms, the story of how Jammin' (Atari, 1985, unreleased) was rescued and reconstructed from backup tapes: youtu.be/fyDi5I-12NE?...

Folks, my mini-IBM PC is finally complete and fully documented! I invite you to take a look at the full tutorial and a section on why and how I designed this build. Please share this news and thanks to all who encouraged me. adafruit-playground.com/u/AnneBarela...

This is the infamous PC demo, Area 5150, that can only run properly on an original IBM PC with a CGA card... ...running on an EGA card. #retrocomputing

The internet was in the corner of the living room and you went there for an hour or two and then you stopped and did something else for the rest of the day.

My dumb floppy disk tricks on Tom's Hardware too. www.tomshardware.com/pc-component...

Now I just need to find a third way to put cats on floppy disks.

For the final day of #DOScember 2025 here is part 4 of my #IBM5150 restore series. With lots of help from the community, I try to trace down what IC(s) are keeping the board from booting. Happy Janky New Year! IBM 5150 will return! youtu.be/p_PW85AOUFg #RetroComputing #VintageeComputing #IBMPC