Steve Ciarcia is an embedded control systems engineer. He became popular through his Ciarcia’s Circuit Cellar column in BYTE magazine, and later through the Circuit Cellar magazine that he published. He is also the author of Build Your Own Z80 Computer, edited in 1981 and Take My Computer…Please!, published in 1978. He has also compiled seven volumes of his hardware project articles that appeared in BYTE magazine.

In 1982 and 1983 he published a series of articles on building the MPX-16, a 16-bit single-board computer that was hardware-compatible with the IBM PC.^[1][2][3]

In December 2009, Steve Ciarcia announced that for the American market a strategic cooperation would be entered between Elektor and his Circuit Cellar magazine.^[4] In November 2012, Steve Ciarcia announced that he is quitting Circuit Cellar and Elektor would take it over.^[5]

In October, 2014, Ciarcia purchased Circuit Cellar, audioXpress, Voice Coil, Loudspeaker Industry Sourcebook, and their respective websites, newsletters, and products from Netherlands-based Elektor International Media. The aforementioned magazines will continue to be published by Ciarcia’s US-based team.

Source: Steve Ciarcia – Wikipedia

Free online library on electronics. All issues of Circuit Cellar mazagine and more

Source: Download Circuit Cellar 2014 archive free

HOWTO: Repair a broken Ext4 Superblock in Ubuntu

31mar10

This has happened to me a few times, and it’s not a nice problem to find yourself in. You computer won’t boot, all your filesystem checks tell you you’ve a bad superblock, but you cant seem to find how to fix it. Well, here goes

This guide is for ext4 , though I’ll explain how other filesystems can be cured along the way. The easiest way to carry all this out, seeing as your computer probably won’t boot at this stage, is to download and burn a copy of Parted Magic. Boot from that, and you’ll access to a number of useful tools.

First, figure out what partition we’re dealing with.

1	sudo fdisk -l

The above will list all the partitions on all the drives in your computer. To recover a lost partition, your going to need Testdisk. Testdisk is included in Parted Magic, and there’s a great guide on their site. For this though, we just need the partition number, such as /dev/sda3 or /dev/hdb1.

Now, make sure your superblock is the problem, by starting a filesystem check, replacing xxx with your partition name. Here, you can change ext4 to ext3, or ext2 to suit the filesystem.

1	sudo fsck.ext4 -v /dev/xxx

If your superblock is corrupt, the output will look like this

Source: HOWTO: Repair a broken Ext4 Superblock in Ubuntu | Linux Expresso

I have php file that contains variables:$t1 = $_POST[‘t1’];$t2 = $_POST[‘t2’];and I need to pass these variables into the respective html form fields:form is located in different page than php file with variables. it’s url is “form.php”I guess I need to create php post command in my php file that redirects to url “form.php” and loads $t1 and $t2 into respective form fields “field_1” and “field_2”?Trying around but can not find right solution..Any ideas appreciated Brgds, Raivis

Source: php pass data to html form – Stack Overflow

I have a working JavaScript function declared in the head of an HTML page. I know how to create a button and call the function when the user clicks the button. I want to call it myself some where on the page:myfunction();How do I do it?

Source: html – How to call a JavaScript function, declared in , in the body when I want to call it – Stack Overflow

Source: XML DOM – HttpRequest object

I’m trying to post data to a PHP page and check the response. Here is an example. What is wrong with this code?index.html

Source: php – POST from XMLHttp with parameters – Stack Overflow

How can I SELECT the last row in a MySQL table?I’m INSERTing data and I need to retrieve a column value from the previous row.There’s an auto_increment in the table.

Source: Select last row in MySQL – Stack Overflow

I have a pre-existing table, containing ‘fname’, ‘lname’, ’email’, ‘password’ and ‘ip’. But now I want an auto-increment column. However, when I enter:ALTER TABLE usersADD id int NOT NULL AUTO_INCREMENT

Source: mysql – Add Auto-Increment ID to existing table? – Stack Overflow