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Jeff Jetton

@jeffjetton.bsky.social

He’s an accordionist and pianist. You might see him tweeting about bikes, old computers, and data science too.

49 Followers  |  74 Following  |  121 Posts  |  Joined: 09.11.2024  |  1.6703

Latest posts by jeffjetton.bsky.social on Bluesky

35mm print of "Apollo 13".

05.02.2026 16:02 — 👍 1    🔁 0    💬 0    📌 0

Does the Atari VCS/2600 count? If so, that.

If not, the Atari 400.

21.01.2026 18:02 — 👍 1    🔁 0    💬 0    📌 0

Coca-Coli

07.01.2026 15:51 — 👍 3    🔁 0    💬 0    📌 0

We drove 750+ miles to Mackinac City, took the ferry, and stayed a few nights at the Grand Hotel... all because of "Somewhere In Time".

The island did NOT disappoint. Wonderful place!

29.12.2025 18:00 — 👍 3    🔁 0    💬 2    📌 0
NANCY BY ERNIE BUSHMILLER 
P1- NANCY SEES SLUGGO DOWNTOWN 

NANCY: DID YOU GET THAT CONCERTINA FOR CSHRISTMAS?

SLUGGO: YEP -- AND I'M GONNA
MAKE MONEY WITH IT

P2- SLUGGO HAS MADE A SIGN THAT READS… DEPOSIT PENNY TO HEAR MUSIC, SLUGGO HAS A TIN CUP SITTING ON A CRATE 

P3- SLUGGO IS PLAYING HIS CONCERTINA MUCH TO THE DISPROVAL OF PEOPLE PASSING BY

FIRST MAN:AWFUL 
SECOND MAN:PHOOEY 
WOMAN:TERRIBLE 

P4- SLUGGO HAS CHANGED HIS SIGN, IT NOW READS…DEPOSIT PENNY TO
STOP MUSIC
SLUGGO IS NOW PLAYING THE CONCERTINA WITH A GRIM EXPRESSION ON HIS FACE.

NANCY BY ERNIE BUSHMILLER P1- NANCY SEES SLUGGO DOWNTOWN NANCY: DID YOU GET THAT CONCERTINA FOR CSHRISTMAS? SLUGGO: YEP -- AND I'M GONNA MAKE MONEY WITH IT P2- SLUGGO HAS MADE A SIGN THAT READS… DEPOSIT PENNY TO HEAR MUSIC, SLUGGO HAS A TIN CUP SITTING ON A CRATE P3- SLUGGO IS PLAYING HIS CONCERTINA MUCH TO THE DISPROVAL OF PEOPLE PASSING BY FIRST MAN:AWFUL SECOND MAN:PHOOEY WOMAN:TERRIBLE P4- SLUGGO HAS CHANGED HIS SIGN, IT NOW READS…DEPOSIT PENNY TO STOP MUSIC SLUGGO IS NOW PLAYING THE CONCERTINA WITH A GRIM EXPRESSION ON HIS FACE.

Nancy By Ernie Bushmiller
December 29,1947
Note: A concertina is a hand-held, bellows-driven musical instrument with buttons on each end, similar to an accordion

29.12.2025 16:31 — 👍 537    🔁 68    💬 14    📌 7

Yup, concertinas and accordions are both part of the "free reed aerophone" family. The main difference is that the buttons on a concertina are pushed in from the sides, in the same directions the bellows move, whereas the buttons/keys of an accordion are pushed perpendicular to the bellows.

29.12.2025 17:28 — 👍 2    🔁 0    💬 0    📌 0
The Last Time - The Andrew Oldham Orchestra
YouTube video by M's Music The Last Time - The Andrew Oldham Orchestra

Well then you might enjoy this orchestral cover of the Rolling Stones' "The Last Time", which is where the Verve got it from: www.youtube.com/watch?v=9Yrl...

23.12.2025 19:18 — 👍 1    🔁 0    💬 0    📌 0

That's a 12, and yes, it's gorgeous!

17.12.2025 17:48 — 👍 1    🔁 0    💬 0    📌 0

Nice! Reminds me a bit of The Hues Corporation's "Rock the Boat" for some reason.

17.12.2025 14:41 — 👍 1    🔁 0    💬 0    📌 0

That is stupid and also I'm stealing it.

13.12.2025 20:56 — 👍 0    🔁 0    💬 0    📌 0

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.

12.12.2025 19:33 — 👍 2    🔁 1    💬 0    📌 0

Technically the sunrise isn't affected either way. It happens when it happens and doesn't care whether we call that moment 7:00 or 8:00 or "Gary".

DST is just everyone doing everything an hour earlier and tricking themselves that they're not by changing the clock. (Which is kinda dumb.)

09.12.2025 15:46 — 👍 0    🔁 0    💬 0    📌 0

Just four times better.

It's in binary.

26.11.2025 19:11 — 👍 1    🔁 0    💬 1    📌 0

Ooooh! Where'd you find a 6502 FOCAL?

26.11.2025 15:38 — 👍 2    🔁 0    💬 1    📌 0

Yup! With a 12-bit word length and six-bit character encoding often being used, octal was a much better choice than hex. Plus the PDP-8 instruction set lent itself well to three-bit groupings.

26.11.2025 15:32 — 👍 1    🔁 0    💬 0    📌 0
A table of 6502 CPU machine language instructions along with their octal opcodes

A table of 6502 CPU machine language instructions along with their octal opcodes

I'm probably the only person on the planet who currently needs this, but here's a 6502 Opcode Reference... in octal!

#ChuckPeddleDay

25.11.2025 17:44 — 👍 17    🔁 3    💬 3    📌 0
Photo of an electronics breadboard with several IC chips and wires. The chip in the upper left is a 65C02 CPU. An alphanumeric LCD screen in the lower right is displaying "Happy Chuck Peddle Day!"

Photo of an electronics breadboard with several IC chips and wires. The chip in the upper left is a 65C02 CPU. An alphanumeric LCD screen in the lower right is displaying "Happy Chuck Peddle Day!"

Celebrating #ChuckPeddleDay with a 65C02.

25.11.2025 17:41 — 👍 19    🔁 3    💬 0    📌 0
Post image

People want artists, but don't know what it takes to become one. Keep going.

03.11.2025 20:47 — 👍 72    🔁 23    💬 1    📌 0

You mean "reduced-price candy day"?

31.10.2025 16:32 — 👍 0    🔁 0    💬 0    📌 0

The girl looks like she's holding a cellphone.

28.10.2025 16:41 — 👍 1    🔁 0    💬 0    📌 0
The 1967 black-and-white photo "The Ultimate Confrontation: The Flower and the Bayonet", showing a 17-year-old girl holding a chrysanthemum in front of a line of bayonet-wielding soldiers, during an anti-war march in Washington, DC.

The 1967 black-and-white photo "The Ultimate Confrontation: The Flower and the Bayonet", showing a 17-year-old girl holding a chrysanthemum in front of a line of bayonet-wielding soldiers, during an anti-war march in Washington, DC.

Our generation's "The Ultimate Confrontation"?

12.10.2025 22:43 — 👍 4    🔁 1    💬 0    📌 0

Imagine if you went to see a play in the theater, and every few minutes it just *stopped*. And you had to wait while the actors set up for the next few lines of dialog, and the director chatted with the lead about motivation, and commentators ad-libbed to the audience about how the scene was going.

12.10.2025 15:20 — 👍 2    🔁 0    💬 1    📌 0
Preview
BBC Micro Compendium : Jeremy Ruston : Free Download, Borrow, and Streaming : Internet Archive Book with information on 6502 programming, on computer arithmetic, with two language implementations and a thoroughly annotated disassembly of Acorn's BBC...

It's on Archive.org of course. But it would be cool to have the dead-tree version!

archive.org/details/BBCM...

10.10.2025 16:55 — 👍 1    🔁 0    💬 0    📌 0

Bayes City Rollers?

08.10.2025 21:23 — 👍 4    🔁 0    💬 0    📌 0

I thought EOR affects N and Z just like LDA?

25.09.2025 20:44 — 👍 0    🔁 0    💬 0    📌 0

Not strictly for 6502, and maybe obvious, but...

If the last thing your subroutine does before RTSing is JSR to another subroutine, you can replace the JSR with a JMP and omit the RTS, saving a byte and several cycles.

25.09.2025 20:37 — 👍 2    🔁 0    💬 0    📌 0
Black and white photo of singer/pianist Les McCann on stage, singing and playing a Fender Rhodes electric piano with an Arp Pro Soloist synthesizer on top.

Black and white photo of singer/pianist Les McCann on stage, singing and playing a Fender Rhodes electric piano with an Arp Pro Soloist synthesizer on top.

Les McCann too!

23.09.2025 14:07 — 👍 2    🔁 0    💬 0    📌 0

I once toyed with the idea of using indentation in 6502 assembly as Pythonesque way to branch without labels.

I started on a proof-of-concept preprocessor to read the weird code and turn it into standard assembly. Not sure why I abandoned it... might revisit it one of these days.

17.09.2025 22:25 — 👍 1    🔁 0    💬 0    📌 0
Photo of a homemade 6502-based computer, built on a breadboard. There is a 16-key membrane keypad and a small LCD display connected to it. The display is showing the status of the CPU registers.

Photo of a homemade 6502-based computer, built on a breadboard. There is a 16-key membrane keypad and a small LCD display connected to it. The display is showing the status of the CPU registers.

Celebrating the 6502's 50th anniversary the best way I know how...

17.09.2025 22:08 — 👍 1    🔁 0    💬 0    📌 0
Preview
On 9/16/25, celebrate a date of mathematical beauty Pythagorean Triple Square Day, as one man affectionately calls 9/16/25, is a day like no other this century.

Pythagorean Triple Square Day, as one man affectionately calls 9/16/25, is a day like no other this century.

16.09.2025 11:50 — 👍 1197    🔁 631    💬 23    📌 111

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