Just letting you know, we have written a basic powernow driver, which works in dos, for reducing the voltage, frequency of CPU (only works on M 3400+ at this stage).This is great for laptops, which cannot really be run in DOS mode, since they trip out if they have a powerful CPU. This is in its early stages, but works very well. Please check out the Assembler Slobs site for source and binary (com).

http://www.geocities.com/agivney

We hope to implement support for all powernow cpu's in dos, with the ability to set the frequency to what you wish. The code is still rough (Please ignore the sleep function; it is a complete joke), and written in such a way that it is VERY easy to change for your own processor. Optimisations are not necessary, as the code is run once. This code is a very simple implimentation of the K8 Linux powernow driver. Please read the site for more details.

DOS on a k8? What's the point?

The point for me, especially from an assembly language standpoint, I would prefer to have an option for programing other than Windows and Linux. This same driver should be able to be implemented in Menuet operating for instance (Kernel), yet without being able to powerdown the cpu, Menuet cannot be run for long on a K8 laptop. Also, I like programing in Dos. Before I could not, now I can. Dos does not mean using Dos, it means a system already provided to build upon, where privilage level system cpu commands can be used, e.g wrmsr,hlt, etc (Fat32 file system, mouse,etc). I plan to write a usb driver next, and hopefully begin work on the beginnings of an operating system (purely for knowledge sake). The driver enable me to do this. That is why I felt it was important to write this.

And some people (like me, too) just love DOS enough to want to run it anywhere.

Thanks Privalov for the positive comment! Just letting you know, I included the code (less the dos exit function) in the Menuet Kernel, and it works great!! No more noise and overheating!When I get time, I will paste the source kernel and full menuet image with Powernow support on my website. Thanks

I've found a mistake in your source: you should not put "use32" in the beginning when you want to run it from pure DOS. However your .com file contains instructions correctly assembled for 16-bit mode - perhaps you've added the "use32" keyword later?
Also, something like "times 320 nop" might have been more handy for both writer and reader.

The changes you suggested have been implemented, and the code on the website updated. Thank you for your advice, I need it.

agivney & Privalor, i like you's like a Dos like environment, but to get over the limits of Dos, i and a group of other programmers are making a 32bit pmode Dos like OS, there even some one in the group making a usb driver for the OS, we are all learning as we go, so the code is not the most efficient or smalist asm code, but it runs and does the job well.

I will definitely look over the source code. Thanks for the tip. I have just started researching for the writing a USB driver (Downloaded linux usb driver source , usb specification documents etc), so it is great that someone else is having a go. When I look over the code i will be touch.

Here our forum http://dex.7.forumer.com/
and tonyMac is the programmer working on the USB, here his web site: http://tonymac.asmhackers.net/

Here are some good links for USB for dos:
http://people.freenet.de/dieterp/main.htm
http://www.frontiernet.net/~fys/usb.htm

Hope these help .