Posted by, XlogicX on August 28, 2008 at 11:16 pm
There are a few ways to purchase a product with the price of another. Before I talk about that though, I’ll review the meaning of the bars and numbers on the bar code. After that, I’ll explain tricks like “inking” and the “sticker.”
Review: What bar-space combination will make a meaningful number? For UPC-A, there is about 23 different meaningful characters: 1 start guard, 1 center guard, 1 stop guard, 10 left hand data characters, and 10 right hand data characters. I specify right and left because the code is different on each side. Imagine the data characters as 7-bit binary words; where the 0 is a space, and a 1 is a line.
Notice that all left-hand characters start with a 0 and end with a 1. Also, the right hand side is just the compliment of the left-hand side; so if the bit were a 0 on the left for a certain character, it would be a 1 on the right for the same character. Another thing to notice is that there are two variable width spaces and lines per character, no more, no less.
Continue reading “BarCode Tricks” »
Posted by, XlogicX on January 5, 2007 at 8:34 pm
More permanent meeting location; The Willow House. Ugly shows us his Guitar Hero hardware hack (oscillating bar). XlogicX shows how to rip up a 9-Volt to get 6 AAAA batteries.
Attendance count: About 15
Posted by, XlogicX on October 7, 2006 at 5:46 pm
Lots of new people, and even old people; Dual and Kondor return. AgentOrange has presentation on non-SQL database hacking with PHP. Ugly brings a Jacob’s ladder. XlogicX brings a toy: GPS and LCD modules connected to a Basic Stamp 2e processor. WTF item for this month was brought by NAK, it was a bee feeder, I forget who guessed it, and if it was even a legitimate guess (many clues were given).
Attendance count: About 25
Posted by, XlogicX on February 4, 2006 at 5:26 pm
First meeting at Counter Culture Cafe. Evil1 has presentation about php/sql hacking. XlogicX hacks alarm clock to hook up big external speakers. Snap Circuit toy is played with. XlogicX brought Wal-Mart security device and dremel, Evil1 cuts the shit out of it.
Attendance count: About 15
Posted by, XlogicX on April 1, 2005 at 8:17 pm
RetroTech brought his Tandy laptop, it had DOS 3.3 and only 7 files on the “storage” space (50K worth). The lappy boots up in less than 5 seconds though, the video should be up on the April 2005 pictures page. We fixed the power adapter by soldering it back together. I tried a floppy drive hardware hack, but screwed up, now retro has no floppy…sorry retro. Zapperlink brought a PSP and showed us a browser hack for it. Sgnome brought a huge antenna, there should be pictures of it. Nak and his buddies brought a ham radio. Also, greyarea was there, cool he could make it this time. Oh yeah, Zapperlinks daughter (Trinity) tried out picking locks…she’s not even 2 yet!…again, pictures on the picture section 
Attendance count: About 22
