KIM-1

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:

Retro Computer Calendar 2026 by Loudscotsbloke Retro Computer Calendar 2026

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!🎄🎅🎄🎅🎶🎶

Virtual 6502 Assembler Virtual 6502 Assembler: A simple, but compatible 6502 assembler for the web.

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

6502 Instruction Set A comprehensive instruction sheet for the MOS 6502 MPU.

www.masswerk.at/6502/6502_in...

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 Hackaday Article

Emulate ROMs at 12MHz With Pico2 PIO

Nope, not a hater. LLM code is great for wrangling overly complicated declarative user interfaces and other template situations. It’s great for pushing symbols around and that’s what the boring part of coding is these days.

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.

Sorry man! No good deed goes unpunished :-/

And a Happy Christmas to you too! :)

Will you be sharing the 3D models?

So cute!

And it could play music too!

Ah those RIOTs. At least there are modern recreations

Yeah. The PCB costs are so much higher than they used to be. Maybe can find some like-minded US folks to share the cost.

Be nice if there was a place in the US to get one! The tariffs suck ass.

For all things 6502..

retro.hansotten.nl/6502-sbc/

I’d like the PAL-2 one for sure.

Exactly!

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.