Other Utility Mill scipts

-
I have made several utility mill scripts in the past and since I am reminded of it again, I might as well post links to my other utilities. Hopefully, someone will find it useful:

Comments

Post a Comment

Popular posts from this blog

Repairing Roomba charging circuit

-
Image
Sometime ago, a colleague told me that she bought a Roomba 405 but the battery seems dead, unable to charge. Being the curious me and how I like to fix things, I made a deal that if I could fix it, I can use it to clean my house for 1 month :-) So, this post is a sharing and also a kind of documentation for myself on how I got the Roomba working again. Initial diagnosis.... So, the next day she brought the Roomba to me in office and I took it home. First step, I tried to charge it by connecting the AC-DC adapter to the robot. According to the user manual, it seems charging. The amber LED is blinking slowly. A few hours later, I detached the power and try to see if it moves by pressing the "Clean" button. Nope, it is dead as a log. So, next step, I took my multimeter, removed the battery and measured the battery terminal voltage. Huh, it reads approx 0.6V? Now, I gotta monitor the voltages while charging to figure out what's wrong. I attached 2 thin wires to the terminals,...
Read more

VirtualBox Hardware Virtualization and Nested Paging

-
Recently discovered that I could enable nested paging for Virtualbox 2.1. Nested paging is a new hardware virtualization extension on AMD K10 Barcelona/Phenom and Intel Core i7 Nehalem processors that allows processor to offload memory paging required by the guest OS that is traditionally done by the VM with shadow paging. Since it is a new feature, it is not available in the configuration UI yet. First, you will have to enable hardware virtualization (VT-x/AMD-V) in Settings -> Advanced. Then, nested paging can be enabled as described in the VirtualBox User Manual with the following command: VBoxManage modifyvm -nestedpaging on The performance boost is quite noticeable. The boot up time for my virtual Windows XP has drop from about 25 seconds to 18 seconds. Super PI Mod has dropped from 39.159s to 36.016s Various benchmarks on the net show performance boost up to 30%. I'll run more benchmarks next time.
Read more

Fixing USB audio controller (CM108) for headphones

-
Image
Cheap USB audio controller Recently, I bought a cheap USB audio controller because my motherboard's built-in microphone input was dead. However, there were some problems with the stereo output. It seems to work well when it was connected to a pair of powered speakers, but there was only noise when connected directly to my earphones. When I measured the output voltage, it shows a 2 - 4 V bias voltage which is unusual because it should not have any bias voltages and normally 0 V when no audio. When plugged into my Linux machine, lsusb shows the following: $ lsusb | grep -i audio Bus 005 Device 003: ID 0d8c:013c C-Media Electronics, Inc. CM108 Audio Controller So, with a little googling for CM108, I found that the datasheet at  http://www.halicky.sk/om3cph/sb/CM108_DataSheet_v1.6.pdf and also Kevin Custer's site about modifying it http://www.repeater-builder.com/projects/fob/startech-fob.html When I opened up the device and compare it with Kevin Custer's photos,...
Read more