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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.

180 Posts68 Follower81 Folgt
Jeff Jetton@jeffjetton.bsky.social · 2mo ago

1/7 This is a very clever trick, and I thought I'd unpack it a little in case anyone's interested: The key is that EOR (exclusive OR, more commonly abbreviated XOR) is a versatile tool that can work as both a "difference detector" and a "bit flipper", depending on how you think about it.

KIM-1@kim-6502.bsky.social · 2mo ago

Incrementing only the lower 4 bits of a byte without touching the upper 4 - no temp, no table: lda counter inc counter eor counter and #$F0 eor counter sta counter The EOR/AND/EOR pattern lets you surgically replace any contiguous bit field. Elegant and brutal. (via bogax, AtariAge)

Jeff Jetton@jeffjetton.bsky.social · 7mo ago

Fun fact: If you celebrated this today at 7AM Chicago time, you were actually an hour early! March 24th, 1984 would've still been under Standard Time, since the switch to Daylight Saving Time wasn't until April back then.

Still of the high school from the "The Breakfast Club", a movie that takes place on a single day of detention. There's a subtitle that shows that the date is Saturday, March 24, 1984. A heading further specifies that detention started at 7AM.
Jeff Jetton@jeffjetton.bsky.social · 2y ago

Theoretical physicist: "If we *were* in the worst of all possible timelines, there would have to have been a significant event precipitating the initial fracture. Something that signaled to the multiverse, oh say two years ago, that we were not deserving of any other timeline..."

Discontinued FoOoOods! 👻🎃@discontinuedfoods.bsky.social · 2y ago

Subway Cadbury Creme Egg Submelt (2023-2023): A 6-inch sub roll, filled with Cadbury Creme Eggs and grill-pressed until toasty golden brown. Was available for free, for one day only, at 4 Subway locations in the UK, with only 500 subs available at each location.

A 6-inch sub roll with grill marks. Chocolate and creme drip from the sides, behind a halved Cadbury egg. In the right corner is an image of a foil-wrapped Cadbury Creme Egg