The other day, the question came up: What does the Revision logo mean?

I am curious about that, too – I had already been pondering about the deeper meaning in 2013 (see the source code of doppelhirn):

// I always assumed the revision logo contains an encoded string in
// the 5 bits used. Either I am missing something, or that string is
// "FDLNDFEAEMLFDF DLFBRSP".

var logo =
  "   0                 000000         "+
  "000000000000000000000000000000000000"+
  "   000000      00  0       0  0   00"+
  "                                    "+
  "000000000000000000000000000000000000"+
  "       000000  000000000  0000000000"+
  "         0          00        000   "+
  "  0000                              "+
  "000000000000000000000000000000000000";

IIRC, when I asked around back then, the answer was “it’s nothing specific, it should just look cool”.

Anticipating, nay!, fearing a definite answer in the Revision orga chat where the question came up again, I wanted to have another shot at it before the mystery was revealed.

Break the cycle, erm, circle

The logo consists of concentric circles and looks like it may contain a bunch of rotary encoded bits:

I was already halfway into writing a tool to extract the possible bit combinations when it dawned on me: Un-circle an image to a rectangular representation? That’s a polar coordinate conversion, and there’s a Photoshop filter for that!

What the bits

First observation: This doesn’t seem to be very regular, neither horizontally nor vertically:

Second observation: My code representation was all wrong! Well, at least not completely accurate, but I think nobody noticed…

Thirdly, I’m really starting to think there’s no hidden message encoded in the logo… But let’s look at the bits.

Errm… Which bits, exactly? Shall we omit the columns full of ones resp. zeroes? Do we ignore the slight overlap in the center?

What are we even looking for? An ASCII string? Relative to which character, shall we interpret 00001 as A?

You decide! I think I’ve spent way too much time on this, and all I got was “EGOWUQUMEGOGEMABZJIMOGEAEM”. :)

Bit fiddler

Search for a deeper meaning yourself if you have JavaScript enabled…

Bits to use	A B C D E F G H I J K
Invert	Switch 0 and 1
Reverse	Reverse bit order
Flip	Change scan order (clockwise, counter clockwise)
Offset	Base character (hexadecimal, 41 = A etc.)
String	...

Manual recalc (should be automatic, though)

Source bits	Effective bits	Hex	Decimal	As character
01001100010	0000000000	00	0	00 = A
01001111010	0000000000	00	0	00 = A
01101111010	0000000000	00	0	00 = A
11001111010	0000000000	00	0	00 = A
11001100010	0000000000	00	0	00 = A
11001000010	0000000000	00	0	00 = A
11001100010	0000000000	00	0	00 = A
01101100010	0000000000	00	0	00 = A
01001100010	0000000000	00	0	00 = A
01001111010	0000000000	00	0	00 = A
01101111010	0000000000	00	0	00 = A
01001111010	0000000000	00	0	00 = A
01001100010	0000000000	00	0	00 = A
01101100010	0000000000	00	0	00 = A
01001000010	0000000000	00	0	00 = A
01001001110	0000000000	00	0	00 = A
11101001110	0000000000	00	0	00 = A
01101001110	0000000000	00	0	00 = A
01101000010	0000000000	00	0	00 = A
01101100010	0000000000	00	0	00 = A
01101111010	0000000000	00	0	00 = A
01001111010	0000000000	00	0	00 = A
01001100010	0000000000	00	0	00 = A
01001000010	0000000000	00	0	00 = A
01001100010	0000000000	00	0	00 = A
01101100010	0000000000	00	0	00 = A

Issue #23 of Pixel Addict Magazine contains a large Teletext special celebrating the 50th Teletext anniversary, and I am featured as one of six “teletext aficionados”, talking about the background of Worms VBI a little. ¡Fabuloso!

Besides the juicy Teletext special, there are articles about game development for the NES, early 1980s “slabtop” computers, and many more. Recommended to every retro lover!

PS: Is it “Teletext” or is it “teletext”? I’ve been using Telext in capitalized form everywhere to denote the general technology. Watching the (excellent!) Teletext @50 documentary, I’ve learned that there’s a difference between Teletext and teletext: Teletext with a capital T refers to Teletext Ltd., a teletext provider from 1993. Confusing, but also defunct since 2010 – I think I’ll stick to “Teletext”, as that seems common as well, and Teletext has been a capital influence on my creative shenanigans. :)

I don’t want to start a series about IDE bashing – I love my IntelliJ as much as it loves spaces instead of tabs. And I applaud the effort to help me with grammar, style, and wordiness! But:

…suggesting a comma at the start of a sentence? Gimme a sec, I’m gonna check dat settings dialog real fastly…

I dunno, dis looks fine, dontcha think?

Good fuck with your improved eloquence!

The NSA has dropped two videos of internal lectures by Rear Admiral (then Captain) Grace Hopper from 1982:

• Future Possibilities: Data, Hardware, Software, and People Pt. I
• Future Possibilities: Data, Hardware, Software, and People Pt. II

You might know her as a groundbreaking computer scientist, author of the first compiler, inventor of COBOL, and for documenting the first “real” computer bug (a moth caught in a relay of the Mark II computer).

I always thought she also coined the term, but it turns out that “bug” has been used way earlier to denote a small mistake or design flaw. Anyhow, in my not-quite-factual history of Teletext in 420 Years of Teletext I credited her for the invention of programming bugs:

When drawing that little Teletext portrait I made sure to include her Navy hat which she is wearing in practically all photos you can find of her. Apparently that’s not a coincidence, she references it at the start of the lecture:

And if you’re wondering why I kept my cap on, I had a reason for that, too. It’s because this is my identifier.

And adds:

I hope you all know by now that every record in a computer system must have an identifier.

Heh, heh… Turns out Ms Hopper was quite the entertainer and a captivating presenter, and had a lot of innovative musings and some rebellious stories to share. Some random tidbits:

• Cars vs. transportation = computers vs. information flow (part one, 4:39)
• Story of the bug (17:51)
• “If anyone of you says ‘But we’ve always done it that way!’ I will instantly materialize behind you and I will haunt you for 24 hours” (25:14)
• Mark I computer referred to as “she” (32:55)
• “Common sense […] seems to be the last thing we use in connection with computers” (45:08)
• Easier to ask for forgiveness later, early computer hackers and security concepts, seperation of data by confidentiality level, systems of computers with specialized servers, interfaces and modularization, the cost of not doing something… – just watch the lecture already! :)

10/10, would watch again.