kim-6502.bsky.social - Profile | ThreadSky | a Reddit-style client for Bluesky

I released an Atari 400 repair video today, but the passive aggressive YouTube analytics system seems to indicate people aren't that interested in Atari repairs.

submitted 9 days ago • 53 comments

My adventures in 6502-land: I discovered that drawing lines is a pain in the ass. The reference algorithm is Bresenham's (https://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm), which is really smart and good, but requires to check which point is at the […] [Original post on piaille.fr]

submitted 16 days ago • 2 comments

Bill Atkinson, a key architect of Mac OS and the associated revolution in human-software interfacing, developed QuickDraw (the original Mac graphics technology), #MacPaint and #HyperCard. The source of MacPaint (in #Pascal and assembly language) is available. github.com/samoli/MacPa...

submitted 163 days ago • 1 comment

Bill Atkinson, the code wizard behind QuickDraw that powered the original Macintosh's graphics sytem, MacPaint and HyperCard passed away yesterday. We all stand on the shoulders of giants and this was one of them. Thank you Bill! You helped pave rest of us.

submitted 16 days ago • 7 comments

So I’m busy going through all these totes of electronics crap that I have in order to figure out what to keep and what to throw away, and I ran into two things… A John Bell engineering 6502 board with a shit load of Io, and this little gem! Which I cannot throw away, but don’t need

submitted 17 days ago • 2 comments

If Bender runs on a 6502, who uses a Z80?

submitted 20 days ago • 0 comments

staring at this at 4 AM and wondering why it doesn't work, like a true assembly coder

submitted 22 days ago • 1 comment

There were variants of the Famicom which contained a variant of the 6502 made by Rockwell instead of by Ricoh. This lines up with the known chain of custody of chip designs, rather than the oft-repeated story of Nintendo "stealing" the 6502 from MOS Technology.

submitted 24 days ago • 0 comments

6502 assembly is actually surprisingly easy to learn, there's only 50ish instructions, and of those, many are duplicated for convenience. INX and INY add 1 to the X and Y registers, respectively. DEX and DEY subtract. BNE jumps if the last compare was not equal, BEQ jumps if it was. Fairly easy.

submitted 24 days ago • 0 comments

I was a 6809 hacker, but the 6502 was a buddy not a rival. youtube.com/watch?v=LrPx...

submitted 23 days ago • 0 comments

(Most browsers can translate, if your understanding of non-English is as embarrassing as mine).

submitted 22 days ago • 1 comment

New blog post - I have listed some Mini PET 40/80 boards on Tindie: blog.tynemouthsoftware.co.uk/2025/06/mini... These replace the motherboard in a Commodore PET, using the original power supply, keyboard and monitor. * 40/80 column * 32K RAM * BASIC 1/2/4 * Mini PET BASIC 4.1 +wedge +file browser

submitted 22 days ago • 2 comments

As far a pioneers in the field of #Commodore products, Jim Butterfield is the first person to come to mind. Here are a sample of Jim Butterfield items including an Amiga 3000 that was Jim's daughters computer. Generous as he was, he passed onto a neighbor and I acquired. #ComMAYdore

submitted 34 days ago • 1 comment

You would tell me if my Tindie store was broken, wouldn't you? Been deadly silent on there for the last few weeks - need to keep checking to see if it's still online. www.tindie.com/stores/tynem...

submitted 26 days ago • 1 comment

Thanks to Paul Schroeter I have also published the SYM-2 Reference Manual. retro.hansotten.nl/6502-sbc/syn...

submitted 27 days ago • 0 comments

youtu.be/OWQO1Egw2M8?...

submitted 26 days ago • 1 comment

I am working on speeding up #Elite on the #Acorn #Electron. It's going well. On the left is the original; on the right is my enhanced version. It's all down to sideways RAM and backporting faster code from the #BBCMicro and #C64 versions. More details in thread. (1/4) #retrocomputing #retrogaming

submitted 27 days ago • 13 comments

Keep Calm And CLD #6502

submitted 29 days ago • 3 comments

What’s the best 6502-based computer from the 1970s and 80s? #retrocomputer

submitted 30 days ago • 6 comments

TIL the PDP-10 and -8 used machine code comparison instructions that would “skip the next instruction” rather than have conditional jumps and calls. I kinda like it.

submitted 30 days ago • 2 comments

@jeriellsworth.bsky.social i've been enjoying this guy's videos on recreating classic cpus and systems from the ground up entirely in 74 series logic. he's working on the commodore 64 now :) youtu.be/MG3j_6DBCIE

submitted 31 days ago • 1 comment

The only flags I care about.

submitted 31 days ago • 1 comment

OH SHIT the 6502 is 50 years old thisk year???

submitted 35 days ago • 1 comment

Run “Kill the Bit” yourself of this web-based simulator. Typing it in on the switches might be the real challenge. www.s2js.com/altair/sim.h...

submitted 39 days ago • 0 comments

Cute 6502 SBC ready for fiddling with. #65uino

submitted 40 days ago • 1 comment

This 6502 kit finally made it - it went on quite the European tour first. #65uino

submitted 41 days ago • 0 comments

Tomorrow, “Kill the Bit” will be 50 years old. Kill the Bit is one of the first ever “type ins” for a personal computer, being designed to run on an Altair 8800 using only LEDs and switches. If you have an Altair or clone, please “type” it in and run it, and post or share a pic! #KillTheBit

submitted 41 days ago • 2 comments

In April 2026, Apple will celebrate its 50th anniversary. If they have any sense, they should release a special commemorative-edition Apple II for it, and use the following to promote its powerful 6502 processor:

submitted 41 days ago • 1 comment

I designed & 3D printed this retro pen holder honoring the 6502 CPU. DM me if you want one. I put a few up on Etsy for sale. The STL files are there too if you want to print it yourself. #retrocomputing #3dprinting

submitted 44 days ago • 0 comments