Linked by Thom Holwerda on Tue 29th Jan 2013 02:17 UTC
"The arithmetic-logic unit is a fundamental part of any computer, performing addition, subtraction, and logic operations, but how it works is a mystery to many people. I've reverse-engineered the ALU circuit from the 8085 microprocessor and explain how it works. The 8085's ALU is a surprisingly complex circuit that at first looks like a mysterious jumble of gates, but it can be understood if you don't mind diving into some Boolean logic."
Thread beginning with comment 550714
To view parent comment, click here.
To read all comments associated with this story, please click here.
To view parent comment, click here.
To read all comments associated with this story, please click here.
Member since:2007-11-11
Am I the only one that misses the old days when we had so many choices in both CPUs and even in X86? We had so many choices, Motorola and PPC and Intel, AMD, WinChip, Cyrix, so many choices! Remember what it was like when you could actually put a different CPU from a completely different company into a socket?
Now we only have 2 companies in X86 (three if you count Via but its nearly impossible to find) and while there are plenty of companies making ARM there just isn't the variation like we had.
Member since:2006-01-09
Am I the only one that misses the old days when we had so many choices in both CPUs and even in X86? ...
Yep I miss'em too. Not enough to want to go back there though. I remember tiptoeing around flaws in specific chips with particular operating systems.
Heck - even 287 chips that would throw a wobbly given a very specific combination of valid (FP) arithmetic inputs. It was reproduceable very consistently. Took a few engineers a while to spot that it was the chip, not the high level code and not the compiler!
Member since:2005-07-06
Am I the only one that misses the old days when we had so many choices in both CPUs and even in X86? We had so many choices, Motorola and PPC and Intel, AMD, WinChip, Cyrix, so many choices!
Yeah there were choices, but most (all?) of them much worse than today in performance per price...
And it seems you don't miss the old times that much yourself - you often write about the goodness that modern multicore x86 chips are.
Member since:2007-02-18
Now we only have 2 companies in X86 (three if you count Via but its nearly impossible to find) and while there are plenty of companies making ARM there just isn't the variation like we had.
There's MIPS. There's nVidia GPUs that doubles as super computers. There's Power/Cell. There's SPARC.
Features
Linked by Thom Holwerda on 05/20/13 11:29 UTC
The day has finally come! Jolla has finally announced the launch device for its Sailfish operating system - and by god this is a looker. It's decidedly different from other phones out there, but it has good specifications and carries a relatively reasonably price tag - EUR 399, and it's up for pre-order today, shipping in the fourth quarter of this year.
Linked by Thom Holwerda on 05/18/13 21:33 UTC
Why does Google get so much credit in the technology industry? Why, despite the company's many obvious failings, do many geeks and enthusiasts still hold a somewhat positive view on the all-knowing technology giant? A specific talk at Google I/O this week provides the answer.
Linked by David Adams on 05/16/13 4:23 UTC
OSNews is a sponsor of this year's O'Reilly OSCON in Portland, Oregon, USA. A lucky OSNews reader will win a free three-day pass, including two tutorials days. To win the pass, post a comment on this story saying something about Open Source Software or OSCON. We'll pick a winner at random next week. If you don't have an OSNews account, you may email us your entry. Part of the conference is the 9th annual Open Source Awards, and today the 16th is the deadline for nominations. If you'd like to nominate an outstanding open source contributor, do it here. Read on for more information about OSCON. Update: The 20% discount code for OSNews readers is "OSN."
Linked by Thom Holwerda on 05/11/13 21:41 UTC
"Windows is indeed slower than other operating systems in many scenarios, and the gap is worsening." That's one way to start an insider explanation of why Windows' performance isn't up to snuff. Written by someone who actually contributes code to the Windows NT kernel, the comment on Hacker News, later deleted but reposted with permission on Marc Bevand's blog, paints a very dreary picture of the state of Windows development. The root issue? Think of how Linux is developed, and you'll know the answer.
Linked by Thom Holwerda on 05/08/13 14:22 UTC
This is one of those news items that's fun to write, fun to read, fun to comment on, and where no one will be able to say anything unkind. It's all just one big ball of awesome fluffiness. TuneTracker, the BeOS radio automation software, has just released something very special: TuneTracker System 5, the first version designed entirely and specifically for Haiku. In fact, it actually includes Haiku in the software package. Better yet, TuneTracker also unveiled several system-in-a-box products - which have Haiku and TuneTracker pre-installed.
Linked by Thom Holwerda on 05/02/13 15:28 UTC
Exactly twenty years ago, a document was published that played a huge role in establishing the web as we know it today. Twenty years later, and this simple and straightforward document is proof of an irrefutable fact: while closed technologies can change markets, open technologies can change the world.
Linked by Thom Holwerda on 04/29/13 21:06 UTC
Oh multitasking. That staple of computing that got thrown out the window with many modern smartphones. We got some rudimentary thing in its place - but even as multitasking on phone and tablets improves, its user-visible side remains cumbersome. Windows 8 has a neat implementation, and now it's time Android follows in it footsteps.
Linked by Thom Holwerda on 04/24/13 22:24 UTC
They're here! Whether that excites you or not remains to be seen, but the Galaxy S4, which will most likely become the best selling Android smartphone of the year by a huge margin, has been reviewed by all the major sites, and there's lots of interesting conclusions in there - although I think most of you will get the gist.
Linked by Thom Holwerda on 04/18/13 11:21 UTC
Nokia has posted its quarterly results for the first quarter of 2013, and just like the quarters that came before, there's not a whole lot of good news in there. The rise in Lumia sales still can't even dream of making up for the sales drop in Symbian phones, and when broken down in versions, the sales figures for Windows Phone 8 Lumias in particular are very disappointing. In North America, Nokia is getting slaughtered.
Linked by Thom Holwerda on 04/16/13 9:29 UTC
The day has finally come: Google has started shipping Google Glass to the lucky few early adopters. Now that it's shipping, Google has also unveiled a lot more about the API and the specifications of the device itself. While the company had already given out substantial details at earlier occasions, there are still a few surprises here.More Features »
Sponsored Links
Member since:
2007-02-18
Well, so far, they've managed to emulate its performance so they're part way there already.