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After supplying all your  Embedded Development Tool needs for 42 years
 Computer Solutions Ltd and its web shop are now closed.



 Having reached the grand old age of 75 it is time to relax and fulfil other ambitions.

 Its been an exciting ride with you, our customers, often on the bleeding edge of technology
 and I thank you for your friendship, your trust, and your orders.

Stay well        I wish you all success in your future projects.

Chris Stephens.



     But what to do with the web site ?  It has taken >12 man years of work to create a repository of knowledge on many aspects of the art and science of embedded microprocessor development and even after closing the shop it still gets over 4,000 visitors per month.  So as a service to my customers I have decide to keep it live providing my technical insights on the products and then redirecting viewers to sites where they can purchase the items they used to buy from us. Follow the link   "Home"

       The  "Information zone"  consists of articles produced as background tutorials on subjects of interest to those designing new products.  As different CPUs have became available this has lead to new development techniques and in particular to new ways of communicating between nodes.


Home Information Zone

Although retired I will continue to monitor my email and will be happy to discuss any questions or proffer advise requested.  But this will be on a more leisurely 2 or three times a week basis rather than the twice hourly response prior to 1/1/21


Here are some of the products COMSOL have distributed recently and where you can purchase them now
                I've left my web site as at 1 Jan 2021 to avoid empty links and so you can see my views on the products


PEmicro    Background Debug /  JTAG /  SWD     Supply low cost debuggers with USB and Ethernet interfaces for ARM, Motorola/Freescale/NXP Qorivva PPC 55xx/56xx/57xx and Kinetis as well as a BDM interface to 68HC08, HCS08, HCRS08, HC12, HCS12, HCS12X, HC16, CPU32, Coldfire and Power PC 500, 800 series and MAC71xx,72xx. They also supply supporting debugging and flash programming software.  Their Cyclone range of units are ideal for production as well as development.  They can be interfaced by Ethernet, USB and Serial ports as well as being loaded with multiple memory images and disconnected from the computer to act as standalone flash programmers. When used in production programming multiple Cyclones can be run from a single PC. Cyclone units are now available for ARM, all NXP, as well as Renesas, Hitachi and STM chip families. 

For PE products       Follow this link


Embedded Systems Academy   for CANopen    monitors:  CANopen Magic,  Software for Windows and selected micros        Follow this link


Peak    CAN and CAN FD interfaces, and modules         Follow this link


Lawicel    CANUSB  and CAN232   low cost CAN dongles  are available from

PROMjet  ROM emulators - particularly good for large size versions >= 32 Mbits available   from EmuTec  see their web site

Atollic C/ C++ Compiler and development environment  -   was purchased by  ST  and is now available to support the STM32 family

CMX-RTX Real time Executives     for a wide range of CPUs  my Web pages are on  CMX.htm
                  and CMX-Micronet a TCP-IP stack that will run on 8, 16 and 32 bit micros.
                 These are available from CMX see their web site
                 CMX MicroNet are my pages on MicroNet  and the Introduction to TCP/IP that I wrote as a sales tool was well received
                 and is still a good start point for anyone adding TCP/IP to an embedded product


USB Protocol analysers -  these are available from the manufacturer
                They are not cheap USB2 analyser starts at EUR 900 but their software is very good and their product range covers

                 both Analysers and Generators for USB 1-3, power USB, Wireless USB, Wimedia and Bluetooth.



 Information Zone

CLICK Embedded Tutorials

Do you need to quickly become knowledgeable about a CPU family or Embedded USB, CAN or TCP/IP or On-Chip Debugging ?
If so we have prepared a series of short Technology Tasters to get you up to speed with the Micros, Standards and jargon.  We hope you will find them informative.


About us

Computer Solutions Ltd or COMSOL for short has been in business for 42 years selling embedded development tools and working on consultancy projects. During this time our consultancy activities have ranged from designing true single chip applications to one system which has over 7,000 linked 8 bit microprocessors (and that was before the days of ARM chips and even the internet).


Home Information Zone
Computer Solutions Ltd
87 Briar Road,  Shepperton,  Middx,  TW17 0JB
Telephone: +44 (0) 77 4342 2526   
Email:      Web:
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