The Jolt/SuperJolt/TIM Simulator got serial input/output! USe with an an extermnal terminal like VT100 (or PC). Or local terminal emulator with a virtual null modem, com0com on Windows, socat on Linux. retro.hansotten.nl/6502-sbc/653...

Happy #ExtremeMaskingDay, fellow freaks and geeks. Let's all take a deep breath and visualise something calming and familiar. Could be a line of 6502 assembler, could be the scratchy pots on a beloved but decrepit Moog Rogue, whatever works for you.

I wrote a blog post on my 6502 build! pyramidschematics.cc/electronics/... I've wrote a blog post on my 6502 build. I wanted to try something new and see how far I could push perfboard before it starts looking too messy. Feedback is more than welcome please :) Enjoy! #6502 #retro #electronics

Prog8 MacOS Toolchain Setup for Retro 6502 Development #Prog8 #Commodore64 #CommanderX16 #Homebrew #RetroComputing #MOS6502 #VICEEmulator #IntelliJIDEA #GameDev #8Bit theoasisbbs.com/prog8-macos-...

Is the C64 a good platform to learn 6502 assembly on? Also I genuinely don't remember if I had asked that question already before lol.

X-Mas Quest: Can I do a 6502 X-mas themed game for the Commodore PET in a single day? Progress so far…

Since it’s been well over 40 years since I first laid my hands on the #c64, I’m feeling like I want to dig into and try to actually learn to program 6502 assembly. As if I don’t have too many projects and interests already. 🤣 What can I say? The C64U has me inspired!

New blog post: Faster isn't always better - A Cautionary Tale. blog.tynemouthsoftware.co.uk/2025/12/fast... An unexpectedly seasonal post, the red and green in the first photo looking very festive, piles of presents, and the feature charts from Microchip looking like they got them out of a cracker.

I look at #Commodore64 Profile Guided Disassembly, a technique to allow code and data to be automatically disassembled, squeezed, and relocated. This is really useful for compressing and relocating SID music files. Warning: *very technical* youtu.be/0youNHO0Mbg

Last weekend, last few days - before Christmas and the Vintage Computing Christmas Challenge ❄️ 2025! Deadline 24th Dec 2025. logiker.com/vccc2025 #sizecoding #vintage #retro #vccc2025 #BASIC #assembler #6502 #z80 #advent #apl #MerryChristmas

In theory mine is arriving right on xmas eve (according to my post tracking that is) I have more than enough original C64s to last a lifetime but grabbing Gideon's awesome hardware, in a new case, at an affordable price while possibly helping C= rise from the ashes was enough to sway me.

Who is getting a C64 Ultimate then?

It's time for a winter sale again! 25% off all my C64 games. itch.io/s/175946/sja...

Quick call to @samcoupe.com HQ this morning for some technical advice, and a couple of bodge wires later to cobble Z80/6502 bus timings together and we've got an operational SID card. 🎄

The Waterloo Structured BASIC option ROM is now available in the Commodore PET 2001 emulator! masswerk.at/pet/prgs/#wa... This is a peculiar BASIC extension adding support for structured programming (loops, if-else-elseif-endif, procedures) while adding no tokens of its own to the standard ones.

Does anybody know where you can buy old/new stock of 6502 CPU's The main CPU in the dimmer server rack that controls the main lighting system at one of the theatres I work at just died after 37 years of 24/7 use Do they still make new 6502's anymore? And if they do, are as reliable as the old […]

I just learned that the 6502 is the CPU in some heart defibrillators.... one of my friends might be radioactive and Turing complete

Died #otd Chuck Peddle (1937-2019), American electrical engineer, 6 years ago today #ChuckPeddlelife story...

Was playing around with 6502 assembly the other day and went down the wozmon rabbithole, i got a little inspired and wrote a little 256 byte basic monitor in #uxn I still have 20-ish bytes remaining of freespace so i could maybe get some comfort features in there

Time to get ready for that time of the year: updated "Season's Greetings" available for Commodore PET (40 cols). Get it here: masswerk.at/pet/prgs/#se...

It's done! I have just released the Compendium version of #Elite for the #Acorn #Electron. This massively enhanced version of the original game contains pretty much every feature of #BBCMicro Elite, but on the Electron. Just add 16K of sideways RAM. Links in thread. #retrocomputing #retrogaming

Atari Missile Command for the Acorn Electron Is now available on Stardot, please follow the link, log in, read the post, download the file(s) and get playing. www.stardot.org.uk/forums/viewt...

For the first time the Plus 1 Mini expansion unit for the Acorn Electron is available through Tindie! To celebrate, there's 5% off everything in my Tindie store until the 22nd using code RAMTOP5. www.tindie.com/products/408...

Hmm.. Looking at the calendar, I guess now is the time to say.. If you want something from www.tfw8b.com/shop/ to be delivered before #xmas, you should probably order your #8bit thing via express shipping NOW! #Commodore64 #CommodoreVIC20 #SinclairSpectrum #AndMore

New blog post, that moment when it goes from "Yay! I sold one" to "Oh, now I have to write the documentation" blog.tynemouthsoftware.co.uk/2025/12/i-so... Or, how many times do I need to redraw this schematic until I am happy with it?

Nope. Well, not counting the PiDP-8 kit I bought and put together. But I'm working on a 6502 homebrew that doesn't have enough keys for hex entry, so I wrote an octal monitor for it.

The 6502 is lean and mean. The Z80 is quite convoluted and clumpy. But they make for different brain challenges. The 6502 is a set of speed maths puzzles, the Z80 is more like a who-done-it Nancy Drew mystery

La ingeniería inversa del 6502 y su programación con máximo detalle | #ordenadores #hardware #CPUs | por @alvy.bsky.social www.microsiervos.com/archivo/orde...

Guess I should also link the common optimizations page from the nesdev wiki lol, it has good tips too: www.nesdev.org/wiki/6502_as... I'm much worse at 6502 than those peeps, so I can only really help with optimizing your algorithms if their tricks aren't enough.

Not sure where I'm going with this yet, but I'm determined to make a little festive demo for the Acorn Electron. I have some music ready. Watch this space. :-)

Assembly language programming on 8-bit microprocessors, specifically the MOS 6502 and the Motorola 6809. Having to cram an entire game into 20 kilobytes of memory is an art that has thankfully been dismissed to the dustbin of history.

Don’t make an ASS of U and ME.

”You’ll be visited by three spirits.” The three spirits:

I have once again created a charity Retro Computer calendar for 2026!! Last year you helped raise £44 for charity by downloading my calendar. Let's try and beat that this year!! 🙏 Thank you!! loudscotsbloke.itch.io/retro-comput...

Oric says - happy Christmas!🎄🎅🎄🎅🎶🎶

Drop a piece of code here and try www.masswerk.at/6502/assembl...

New information has surfaced. The Mitsubishi 740 has a ZP indirect JMP opcode that isn't in any of the other 6502 derivatives. I can't even assemble it, gonna have to poke that in by hand. But at least I finally have an answer for the several people that have said "why don't you just use a 6502?"

Learning more 6502 opcodes has been nice so far. using tass64 (cross platform 6502 assembler) to build "hello world" test roms has honestly been a breeze haha

Emulate ROMs at 12MHz With Pico2 PIO

Disappointing response to the new Software Serial card. A lot of work went into that, I was hoping there might have been a bit more interest. I guess those days are gone, the state the world is in right now, people have other priorities, and things have moved on. Oh well.

New blog post - "Can I Add Games to the Penultimate Cartridge?" blog.tynemouthsoftware.co.uk/2025/12/can-... (quick answer is yes, that's why we made the PU+3)

The 25-pin external BlueSCSI is my favorite version! I love how I can just swap it around between all my different systems. This is a great opportunity to get one if you don't have one already.

For all things 6502.. retro.hansotten.nl/6502-sbc/

KIM-1 still going strong! Now need some expansion hardware to get it to “do” something. #6502

We never should have developed chips more powerful than the 6502.

Here’s the story you are searching for: netzherpes.de/post/softwar...

As a young hopeful CS student I had 6502 based boards. I was always jealous of the Z80 kids with their timing tricks and extra registers?!

from a distance, Z80 looks like the best CPU of its era: many registers, register mirrors, block operations, orthogonal mnemonic syntax etc. then you start learning about its gotchas, T-states, many register pairs being unavailable for instructions, and so forth. then you start seeing 6502 as good.