This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.
Messages - Adriweb
Pages: 1 ... 53 54 [55] 56 57 ... 115
811
« on: November 10, 2012, 04:04:22 pm »
Are there hidden tricks to allow the use of Getkey/Output in BASIC programs or even tricks to increase Lua speed by 1000%? *runs*
nspire doesnt allow the use of getkey in BASIC progs? o.o
Nope as they "restricted" it to Math only. For example, you neither can't plto a point on the screen directly, for example (you have to use lists and such, which have to be pre-plotted etc.) That's why Lua's nice:P
813
« on: November 10, 2012, 03:22:15 pm »
Well on TINCS it's easy. But then, you can use the computer view mode  * A hidden(?) shortcut ? Scratchpad is also Ctrl-0 * A Very Quick way to have the n th anti-derivative of an expression ? Enter d n/dx (expr) with n being a negative number 
814
« on: November 10, 2012, 03:00:30 pm »
It's ... "Digital Electronics" (doesn't sound well in english ) 1st year of Enginnering / 3rd year after baccalaureate. by the way, I made myself a program to do what I said before ("But I rememebered that it's not really a multiplication here, since we have to replace the additions by a parity-check operation which turns out to be a xor.") I got :  Which looks good, since when I change the 11th bit to 0, it says there are no more errors... So, the final, error-corrected message would be : 1011 01001101110. We dont have calculators allowed (well, they give us crappy scientifical ones), so how is that supposed to be done efficiently/quickly during an exam  ?
815
« on: November 10, 2012, 02:18:30 pm »
Hi, I have a test soon about a lot of things, including a part with error-correction Hamming codes. I thought I had enough things to work on on my notes, but now it looks like I was wrong  I have this exercise (roughly translated from french) : A transmission has been received, and the message is the following : 101111001101110
1) Determine the syndrome [word].
2) What's the 11-bit message that has been sent ?
So basically, I believe the structure of the message is : 1011110 0110 11 10_______P 3__P 2_P 1P 0(non-bold are the actual content, with maybe an error ? ; bold are parity-check bits) I believe the message contains an error because P3 is 0 while there are 5 "1" at its left, which would have given a "1" for P3. How do I determine the syndrome ? I've looked on wikipedia and such, and it looks like I have to multiply 2 vectors (one being the matrix H of the parity bits things, and the other one being the vector of the whole message), to find a syndrom vector indicating the error position ? I'm not too sure how to do that in my case but here's what I tried :  which gave me [[5][6][7][5]]. But I rememebered that it's not really a multiplication here, since we have to replace the additions by a parity-check operation which turns out to be a xor. -_- Do you have an easy way (or rather, not time-consuming) to know what bit is wrong ? I'm sure I could read a lot more lessons online and eventually find what I need but maybe you guys will know directly what to tell me Thanks ! Edit : see 3rd post in this topic.
816
« on: November 10, 2012, 09:53:07 am »
You probably didn't miss the big news : the discovery of a new TI-84 model : the TI-84 Plus C Silver Edition. Indeed, this impressive new born is surprising everyone, since it was believed that a colored future actually belonged to the Nspire series (with the CX, released in 2011). But do you know the real story behind this discovery, which actually began ... a month ago !? This model started its public appearance in an unusual way... : - October 12th 2012 : someone called ''Ismael "seemathrun" Zamora'' posts a rather uncanny tweet : "@TICalculators can we see thecolor 84. please".
- October 18th, 6 days later : the official TICalculators account answers his question : "Hi Ismael, Thanks for your interest in the TI-84 Plus C Silver Edition. The product is not available at this time. If you'd like to receive an email notification when more info is available, please visit http://bit.ly/RXeD1n " (in 2 separate tweets because of the 140 chars max). TI thus confirms (by mistake?) the existence of previously unknown model, with its full name, as well as a link to their official site, poitning to a page where you can register your email adress to get updates on the model's availability.
- This reply-tweet apparently went unnoticed despite TICalculators' 3500+ followers. Only TICalc.org's account noticed the message and retweeted it, but then again, this retweet managed to remain unseen from the community.
- November 8th, the "leak" : a member of the Cemetech community, 0rac343, creates a topic in which he says that his class (high school) is a pilot class chosen by TI to test a new model TI-84 which will be released in the "next spring" (2013) : The TI-84 Plus C Silver Edition, posting at the same time a photo of it, he took himself, probably without permission.
- The largest TI community websites worldwidly relay the new and everybody starts wondering about technical and general features... (TI-Planet, Omnimaga...)
- TI was contacted multiple times by several communities but apparently didn't reply (yet) as they don't want to comment on the leak.
- Novembre 9th, TechPoweredMath writes an article about it, which got read and cited as source by much bigger tech news websites, mostly on Novembre 10th, like ArsTechnica, itself linked by NBCNews, Engadget...
Impressive, right ? More info on tiplanet's wiki : http://tiplanet.org/wiki/index.php?title=TI-84_Plus_C_Silver_Edition#D.C3.A9couverte_du_mod.C3.A8leSource : http://tiplanet.org/forum/viewtopic.php?lang=en&p=132106#p132106
818
« on: November 10, 2012, 09:47:31 am »
I did know, but it's .... useless Also, yeah, there are a bunch of little things like that (and some are way more "twisted" than that) I'l lsee if I can think of some 
819
« on: November 09, 2012, 04:14:49 pm »
Yup And well, we exchange each other's discoveries, and since Joerg (THE Datamath person ) and Critor are both collectors, they know they can trust each other for the devices safety I've also met Joerg diretly at the 2012's T3 conference, and that reinforces contacts   (Yes, that's Mayim Bialik on the photo too )
820
« on: November 09, 2012, 03:36:09 pm »
Btw, I showed this topic to a TI employee (a z80 master ) and he said it's awesome (or, well, at least talking about all of us here : "Those guys are awesome")
821
« on: November 09, 2012, 03:32:25 pm »
Btw is the calc on the photo a production model or a prototype? Will the consumer OS feature the same GUI?
Good question but I believe that if this is some "final prototype", it wil lstill look the same, and that pretty much applies to the OS look too. But of course, for the OS, that can change over time anyway.
822
« on: November 09, 2012, 07:47:06 am »
I'm gonna think about that, it looks inteesting And btw, you sir deserve 1 internet for making WolframAlpha crazy (first time I actually see something like that on it) : 
823
« on: November 08, 2012, 08:33:29 pm »
Oh, nice! Let's have a 50MHZ calc (compared to 16 MHZ)
and I'm wondering if ti reads along all this....
Oh yeah, I'm pretty sure they do (also, a LOT of visits from TI on tiplanet actually come from Omnimaga (referral))
824
« on: November 08, 2012, 08:17:21 pm »
According to Wikipedia : http://en.wikipedia.org/wiki/EZ80The Zilog eZ80 is an 8-bit microprocessor which is essentially an updated version of the company's earlier Z80 8-bit microprocessor.
The eZ80 (like the Z380) is binary compatible with the Z80 and Z180, but almost four times as fast as the original Z80 chip at the same clock frequency. Available at up to 50 MHz (2004), the performance is comparable to a Z80 clocked at 200 MHz if fast memory is used (i.e. no wait states for opcode fetches, for data, or for I/O) or even higher in some applications (a 16-bit addition is 11 times as fast as in the original). The eZ80 also supports direct continuous addressing of 16 MB of memory without a memory management unit, by extending most registers (HL, BC, DE, IX, IY, SP, and PC) from 16 to 24 bits.
The processor has a 24-bit ALU (Arithmetic Logic Unit) and overlapped processing of several instructions (a so called pipeline) which are the two primary reasons for its speed. Unlike the older Z280 and Z380 it does not have (or need) a cache memory. Instead, it is intended to work with fast SRAM directly as main memory (as this has become much cheaper). Nor does it have the multiplexed bus of the Z280, making it as easy to work with (interface to) as the original Z80 and Z180, and equally predictable when it comes to exact execution times.
The chip has a memory interface that is similar to the original Z80, including the bus request/acknowledge pins, and adds four integrated chip selects. Versions are available with on-chip flash memory and on-chip zero wait-state SRAM (up to 256 KB Flash memory and 16 KB SRAM) but there are also external buses on all models. The eZ80 supports a free TCP/IP stack and operating system based on the Xinu operating system, as well as a real-time kernel. Indeed, that would be pretty darn cool
Pages: 1 ... 53 54 [55] 56 57 ... 115
|
Show Posts