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KIM-1

@kim-6502.bsky.social
640 followers 1.1K following 888 posts

The KIM-1 and classic 6502 related topics. Zero page FTW!

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Rod Hull @futurewas8bit.bsky.social · 13h
An Hour of Random Commodore VIC20 Games - Via Penultimate+3dcr with an Arduino doing the 2mins 👾🕹️⚡ www.youtube.com/watch?v=7Re3... #RetroGaming #Retrocomputing #8bit #VIC20 #Commodore #commodorevic20 #PenultimateCartridge #NOAI
youtube.com
An Hour of Random Commodore VIC20 Games - Via Penultimate+3dcr with an Arduino doing the 2mins 👾🕹️⚡
YouTube video by Rod Hull
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ChipWits & ChipWits Worlds 🤖 Available on Steam! @chipwits.bsky.social · 01/10/2026
🛠️ ChipWits Worlds Devlog: The Commodore 64 Programmer's Reference Guide was my programming bible growing up. I wanted to capture that exact feeling for our in-game manual while writing 6502 assembly for your robots! #RetroComputing #C64 #GameDev #DevLog
Side-by-side comparison: the physical 1982 Commodore 64 Programmer's Reference Guide next to the ChipWits Worlds in-game 65C02 manual, assembly code editor, and 3D robot.
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Zoë H @zoeswipe.bsky.social · 17h
Had a funny conversation the other day with someone who was reliant on Claude to do *anything*, and their mind was blown in disbelief when I said I could write code with nothing more than a basic text editor or compiler. Or if I'm feeling really spicy, a 6502 or Z80 assembler.
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bflmouse.bsky.social @bflmouse.bsky.social · 17h
Personally, I knew the undocumented instructions were there, but never bothered to use them. The rare case where one of them was useful to me was more than outweighed by the hassle of getting my assembler to accept them.
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Simon Harris @simondo65.bsky.social · 02/10/2026
How widespread was the use of the unofficial instructions? Personally I never used them as I like to stay within the bounds of the datasheet,and after a few years of the NMOS 6502,I moved on to the 65C02 where many of those opcodes became documented new instructions and extensions of the originals.
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KIM-1 @kim-6502.bsky.social · 02/10/2026
The 6502 had 56 official instructions across 151 valid opcodes. The remaining 105 byte values were undefined - but not empty. They triggered unpredictable combinations of the real instructions. masswerk.at documents all of them with full cycle counts and flag behavior.
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Andy Hewco @hewco.uk · 01/10/2026
New version of 8bit Pixel Lab for creating graphics and tilemaps for 8bit computer platforms. hewco.itch.io/8bit-pixel-lab New in this version are C64 sprites, Gameboy/Colour and sprites and now five BBC/Electron graphics modes. Also supports Vic 20, C64, Amstrad CPC and Spectrum.
hewco.itch.io
8bit Pixel Lab - Windows, Mac & Linux by Hewco
Create Character map and Tile map graphics for the Vic 20
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GrantMeStrength @grantmestrength.bsky.social · 01/10/2026
Now on TestFlight. Ready to pad out your resume with the hottest 5th generation language? testflight.apple.com/join/uSKD5zEt
Home page of a prolog app. An artificial drawing of a landscape image and a list of topics.
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GrantMeStrength @grantmestrength.bsky.social · 30/09/2026
Latest release of the (free) Retro Computer app includes links to 3rd party emulators - you can read about a system and then use it right on your phone/ipad! apps.apple.com/us/app/retro...
Page from the app showing a 3D model of an Apple IIe and links to emulators.
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bflmouse.bsky.social @bflmouse.bsky.social · 29/09/2026
Apple IIgs. I have one, and I still have some of the development software from back in the 1980s.
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Tynemouth Software @tynemouthsoftware.co.uk · 30/09/2026
A text editor and a command line assembler. Because that's the way I have been doing it since the 80s.
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hansotten.bsky.social @hansotten.bsky.social · 30/09/2026
the KIM-1 Simulator, Notepad++ and comnand line interpreter. Edit, assemble with one click, load code in Simulator and run and debug with symbol table from assembler.
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KIM-1 @kim-6502.bsky.social · 30/09/2026
FloppyDays podcast speaks to Peter Jennings - perhaps the first commercial software developer for home computers. And that home computer? The KIM-1. #microchess floppydays.libsyn.com/floppy-days-...
floppydays.libsyn.com
Floppy Days Vintage Computing Podcast: Floppy Days 167 - Interview with Peter Jennings, Microchess and VisiCorp
Interview with Peter Jennings, Microchess & VisiCorp Patreon: Sponsors: 8-Bit Classics -   Arcade Shopper -   FutureVision Research -   Tuc's Workbench -   Hello, an...
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KIM-1 @kim-6502.bsky.social · 29/09/2026
What is your fav 6502 development platform and why?
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8bitworkshop @8bitworkshop.bsky.social · 29/09/2026
VS Code users: 8bitworkshop now has a preview extension, providing your favorite compilers and emulators in the comfort of your desktop. There are probably a lot of rough edges (and for me the classic IDE is simpler to use) but give it a shot! marketplace.visualstudio.com/items?itemNa...
marketplace.visualstudio.com
8bitworkshop — Retro 8-bit Dev - Visual Studio Marketplace
Extension for Visual Studio Code - Build, run, and debug 8-bit programs — NES, Atari, C-64, and more — with 8bitworkshop's 6502/Z80/6809 assemblers, compilers, and emulators
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smymy_128 @smymy-128.bsky.social · 29/09/2026
colorful conway's game of life simulation i made on skilldrick's 6502 emulator i did this in a hurry, so there's a lot i still have to optimize, but i'm not going to do this now and at least i can put custom rules, #65o2 or #6502 idk
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Zenith @zencorner.xyz · 29/09/2026
6502 is fun and also ow my brain
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Rue Mohr @ruenahcmohr.bsky.social · 29/09/2026
oof, why dont they make 8 bit synchronous counters right? Can you use a high-speed 6502 locked into a LDA cycle? hmm, I suppose not, no reset... The compare are a few less parts if you stick strictly to LS of course... Where is even/odd field?...
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Kelly Adams @kgadams.net · 28/09/2026
Early coding experiences I came across an article on Wired during Blaugust of 2024 and thought I should write something about my own introduction to coding as a teenager.... #6502 #basic #C #coding #pascal #retrocomputing
kgadams.net
Early coding experiences
I came across an article on Wired during Blaugust of 2024 and thought I should write something about my own introduction to coding as a teenager. I sort of forgot to follow up until today, so here we are. My youthful experiences with coding documented here all took place between about 1979 and 1985. I also did a bit of fiddling about earlier than that on computers I briefly had access to: a Commodore PET on a counter at Woodwards or a terminal attached to a PDP 11/70 at the University come to mind.
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KIM-1 @kim-6502.bsky.social · 27/09/2026
See anything familiar? At @computerhistory.bsky.social in California.
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Simon Harris @simondo65.bsky.social · 25/09/2026
As an owner of an Acorn Atom, the addresses $80-$AF and $21C-$23F were my magic.These were unused by BASIC/OS.The first was a useful ZP range to communicate data in and out of your machine code, the second was 36 bytes for short machine code that you didn't have to specifically allocate memory for.
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Simon Harris @simondo65.bsky.social · 25/09/2026
As a teenage 6502 programmer I could never get my head around ($XX,X) addressing, and ignored it. I used ($XX),Y all the time though. After many years of using C, I can see how arrays of pointers might have been useful.
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Simon Harris @simondo65.bsky.social · 25/09/2026
Remember that the addition of X+$xx in LDA($xx,X) wraps around, so if $xx+X > 255, the final address is still taken from zero page instead of page 1. Wrap around also occurs if the X+$xx ends up being $FF, or if you do an LDA ($FF),Y. The low byte of the pointer is from $00FF and high from $0000
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KIM-1 @kim-6502.bsky.social · 25/09/2026
The Commodore PET was the first complete 6502 personal computer - keyboard, screen, cassette drive, all in one case. It shipped in October 1977, beating the Apple II to market by a few months in some regions. Chuck Peddle designed both the 6502 and the machine it went into.
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KIM-1 @kim-6502.bsky.social · 25/09/2026
The 6502's indexed indirect mode - LDA ($xx,X) - added X to a zero page address, then used that location as a pointer. The indirect indexed mode - LDA ($xx),Y - used the zero page address as a pointer first, then added Y to the result. One indexed before the lookup, one after.
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NCP3.0 @ncp3.bsky.social · 22/09/2026
Damn girl are you a 6502's Absolute X Indexed instruction? Because you got great 0xDDs.
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Robert Johansen @srfbob1.bsky.social · 22/09/2026
www.youtube.com/watch?v=LrPx...
youtube.com
THE 6502 SONG
YouTube video by The Taylor and Amy Show
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hansotten.bsky.social @hansotten.bsky.social · 22/09/2026
Added one more KIM-1 program today. Not from Radio Bulletin, but from Byte Book of Computer Music 1979: Teach KIM to Sing retro.hansotten.nl/6502-sbc/kim...
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KIM-1 @kim-6502.bsky.social · 21/09/2026
Elite is now forty two years old..
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Low End Mac @lowendmac.bsky.social · 20/09/2026
New article! This includes some things which haven't been posted before. :) lowendmac.com/2026/vintage...
lowendmac.com
Vintage Computer Festival Mid-West 2026 – Part 2 - Low End Mac
Part 1 couldn’t possibly contain everything I’ve seen over that weekend, and I didn’t wanna leave any parts out – so here’s part 2 as promised. I returned near the Retro Tech Foundation’s Apple Garage...
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DaveDisaster @davedisasterman.bsky.social · 20/09/2026
elite.bbcelite.com
Technical information for two-player Elite - Elite on the 6502
Details of how BBC Micro Elite was converted into a two-player version
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hansotten.bsky.social @hansotten.bsky.social · 20/09/2026
Radio Bulletin published many articles around the KIM-1 in Dutch. I started a new project: translate the articles to English wit source, binary Articles now published Mastermind on the KIM Morse decoding with the KIM Melodiant Frequencymeter EPROM Programmer retro.hansotten.nl/radio-bullet...
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bugbear6502.bsky.social @bugbear6502.bsky.social · 20/09/2026
www.pagetable.com/57
pagetable.com
The 6502 in “The Terminator” – pagetable.com
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KIM-1 @kim-6502.bsky.social · 20/09/2026
Hmm. Looks familiar.
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Pants Pants Revolution @pantsrevolution.bsky.social · 17/09/2026
A new free horror adventure just launched for the Apple II Developer Michael Schaffer has released The Forgotten Room, a free 6502 assembly horror game built for classic Apple II hardware. #Retro #appleii #homebrew #adventuregames #indiegames
pantspantsrevolution.com
A new free horror adventure just launched for the Apple II
Developer Michael Schaffer has released The Forgotten Room, a free 6502 assembly horror game built for classic Apple II hardware.
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level106.bsky.social @level106.bsky.social · 17/09/2026
Yeah. They must have all been asleep that day.. I was sure someone was going to point out that the CPU is a 6510, not a 6502. Though the assembly one would be contemplating would be 6502. (I'm trying to be inclusive.) 😋
A MOS 6510 CPU, as one would find in a C64 computer. 😎
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level106.bsky.social @level106.bsky.social · 16/09/2026
Just spending some time out in the garden. Contemplating the meaning of 6502. 🤓 (Waiting for the internet to point out to me things they think I don't know, in 3.. 2.. 1..) 😉
A Windows laptop, out on the garden table, emulating a C64, with it's beastie 6510 CPU — essentially a 6502 with some bank-switching. 😊
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Wi-Fi Sheep Tech Channel @wifisheep.bsky.social · 12/09/2026
The first #Commodore computer? I finally got around to building my #8bit #KIM1 Uno An #Arduino based recreation of the classic MOS KIM-1 and a great little #6502 retro computing project. Watch the full build here: youtu.be/mdHqsPDwnJ0 #RetroComputing #VintageComputing
youtu.be
#KIM #UNO A clone of...The first #commodore computer? #8bit #arduino build project!
YouTube video by Wi-Fi Sheep Tech Channel
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Retro Computers @retrocomps.bsky.social · 15/09/2026
Mastermind (Source.)
A magazine entry from Soft magazine. Up top, a depiction of a bald man concentrating firmly while looking at a Mastermind board, and the Comodore 64 logo. In the middle, a single paragraph explainer. Down below, a roughly 100 line BASIC program, with copious comments to declare functions. Art by Hans Chr. Thaysen, program by L. M. Laursen.
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Charles Hawn @charleshawn66.bsky.social · 14/09/2026
Hitchhiker's guide to the Galaxy was released 42 years ago today on Sept 14, 1984. Written by Steve Meretzky and Douglas Adams. It was #Infocom's 14th game. What a bad day! As the story begins a bulldozer is preparing to level your house. DON’T PANIC! #Commodore64 #Commodore #C64
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KIM-1 @kim-6502.bsky.social · 14/09/2026
Want to learn 6502? Here’s one way to get started. apps.apple.com/us/app/virtu...
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Andres Plaza 🇨🇱 @andres.mafia.cl · 13/09/2026
Yes!
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L Break Into Program @breakintoprogram.co.uk · 13/09/2026
Got a mention in @theregister.com, though they spelt my surname wrong.
theregister.com
The improbable music of the ZX Spectrum's one-bit speaker
Ingenious coders coaxed multichannel chiptunes from the humblest of sound hardware
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KIM-1 @kim-6502.bsky.social · 13/09/2026
Anyone spot a KIM-1 at #VCFMW ?
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Ken Shirriff @righto.com · 12/09/2026
In 1980, Intel introduced the 8087 floating-point coprocessor chip. Plugging this chip into your IBM PC made math 100 times faster, good for CAD and spreadsheets. I opened up the chip to reverse-engineer exactly how it does complicated calculations. Let's take a look inside...
The integrated circuit is a black ceramic rectangle with 40 metal pins sticking out, in two rows. (This is known as a DIP, a Dual Inline Package.) It has three rows of text: "D8087-1", a cryptic version label, and then the copyright line with a big lower-case I, INTEL m c 1980 1984. The m and c are in circles for the mask-work symbol and the copyright symbol. The chip has a small semicircular notch on the left side, indicating its orientation. The package consists of two thin ceramic layers, bonded together with a gray substance; the metal pins stick out from this gray substance. The ceramic package is important to me because tapping the gray layer with a chisel will cause the two layers to separate, revealing the silicon die inside. In contrast, most chips are in epoxy packages, which are very difficult to open, usually requiring strong acids.
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Army Of Evil Robots🤖🇨🇦 @armyofevilrobots.com · 08/09/2026
I took a weekend basic programming course which ran for several months on one of these. I was 9. I don't think anybody else in the course was under 40, and am now mildly disturbed wondering about the survival rate of my classmates.
Commodore PET 2001
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Climate, Ecology, War & More: Dr. Glen Barry BigEarthData.ai @bigearthdata.ai · 13/09/2026
CW@60: Saying yes - the choices that carried me from a Commodore PET to AI ->Computer Weekly | More on "Technology evolution and career choices" at BigEarthData.ai | #AI
computerweekly.com
CW@60: Saying yes - the choices that carried me from a Commodore PET to AI
On 22 September 2026, Computer Weekly turns 60. To mark the milestone, we asked some of our friends - experts, parliamentarians, IT leaders and suppliers - for their perspectives on how tech has changed their lives over six decades. What's changed the most for you since then? In 1978, I was 18 years old, finishing high school in a small town north of Toronto, and holding university offers in three subjects - physics, engineering and computer science. I picked computer science for a simple reason - I thought it might lead to the most creative changes in society in my lifetime. Nearly 50 years on, I would say the hunch held up. Though I concede it is no longer a slam dunk, quantum technology and gene engineering are still in the running. But Moore’s law, Jensen’s gaming cards and Geoff Hinton’s backpropagation make a good case for computer science. It was a strange bet at the time. My parents were teachers who had never touched a computer. In 1978, the IBM PC was still three years away, and about the only place an ordinary person encountered computing was at the bank, where the tellers had terminals and the first cash...
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hansotten.bsky.social @hansotten.bsky.social · 09/09/2026
retro.hansotten.nl/6502-sbc/kim...
retro.hansotten.nl
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hansotten.bsky.social @hansotten.bsky.social · 09/09/2026
MICROCALCULATOR MODEL-85 A board that serves as a calculator accessible via a parallel 8 bit port, e.g. from a KIM-1. Send commands and read the calculated results. Made by Artisan Electronics in 1977. Acquired August 2026, as built in a KIM-1 with KIMSI system
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Zvyozdochka 🇦🇺 🇨🇦 🇵🇸 🇺🇦 🇬🇱 @zvyozdochka.bsky.social · 10/09/2026
His oral history interview from @computerhistory.bsky.social is absolutely fascinating. www.youtube.com/watch?v=Ne1A...
youtube.com
Oral History of William David "Bill" Mensch Jr.
YouTube video by Computer History Museum
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