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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

The Information Zone

Many of our customers are still at the early design stage and one of the nice things about running COMSOL has been the many discussions we have had on design options with these engineers.  We hope we have been of help.  We don't want the calls to stop so keep phoning.  But we do want to be of help to an even  wider audience and so we have created COMSOL's Information Zone this web area to act as a focus for a wide range of different types of information.  We have a few ideas for its development but would welcome both ideas and contributions from you, the users.


 Technology Tasters

These brief tutorials are designed to help engineers rapidly become acquainted with unfamiliar technologies and CPUs.  During our 40+ years in the game much of the engineering buzz of running COMSOL has come from developing an understanding of new products and their underlying technologies, so we would like to share our knowledge in the hope that it will be useful to you.



Some of the main changes in embedded engineering over the last decade have involved different mechanisms for communicating between Embedded CPUs and from them to PCs. As we have become involved with tools to work with these technologies we have produced a number of  advisory articles explaining the jargon and trying to clarify the important points from an Embedded engineering standpoint.  We hope you find them helpful.


TCP/IP for Embedded Engineers -----  This white paper describes how the TCP/IP protocol can be integrated into embedded systems from 8 bits to 32. It is designed to get engineers thinking about how this powerful family of protocols can be used to solve the communications problems of their applications and to add extra value to their products. 

"I found the white paper that I downloaded from your website to be the best and clearest introduction to TCP/IP that I have found so far. I am new to TCP/IP development and need to find a way to add TCP/IP to our current products.  M. S."

TCP mnemonics ---- Not exactly a tutorial but generally useful as it allow you to tell your ARP from your RARP without your brain going PING - Consult our list of TCP mnemonics.


CAN Tutorial  ---- Describes how CAN operates and what its advantages and limitations are with brief introductions to the networking systems built on a CAN base.


USB Tutorial  ---- Describes how USB operates and what you need to do to use it in your embedded application.


Development Techniques

Background information on microprocessor development techniques

On Chip Development and Flash Programming - BDM / JTAG/ SWD            


CPU Families

Why don't chip manufacturers summarise the facts about a CPU Family in the way that allows an Engineer to get an appreciation of the family in 10 minutes ?  Well probably because Marketing and Sales Departments get in the way.  We don't sell chips - in fact I have often said that there is not much we can sell you before you have chosen the chip to use for a project.  So the next best thing we can do is to help you on the way to that decision by supplying information in an easily digested marketing free format.

This is the first of a series of tutorials that attempted to summarise the features of each of a number of CPU families in a couple of pages/screens.

8051 Tutorial                 8085 Tutorial


If you find any errors in our tutorials please let us know .......... If you would like to try summarising your favourite (or as importantly least favourite) micro in under 2,000 words we would love to add it to our series.

The information provided in the web pages above has been produced in good faith but Computer Solutions Ltd does not warrantee that it is correct and accepts no liability associated with the use of that information....Caveat Emptor.


Supported Chips circ 1997 onwards

In the early days of our web site (1997) there was a much wider range of microprocessor families available to choose from than is the case in 2019. For each Microprocessor chip family (over 100 were listed) our Chips Directory showed all the software and hardware that supports that family and for things like Simulators, ICE, and Programmers it showed which individual chips within the family were supported.

Its not been practical to keep all this reference material up to date but If you want something in this area I will help where I can. 

Micro-Search  The 8051 dominates  2006+
With the arrival of a significant variety of on chip I/O Micro-Search solved a growing problem for designers. Chip manufacturers were using the Internet as the primary source of detailed component data so data books and even CDs were becoming things of the past. But the volume of data required to do a comprehensive survey of which chips had which features for the most popular 8 bit micro of the day (8051 family) became prohibitive. With multiple manufacturers supplying over 1,111 variants, finding the right 8051 device could - and still can take a great deal of valuable resources.
Micro-Search reduced the time engineers needed to spend sorting through numerous unsuitable 8051 specifications. Starting from one of a number of pre-sorted lists that contain comprehensive details of all the processors that match a requirement. A variety of selection criteria are available, such as, number of I/O bits, timers and UARTS, power consumption, clock speed, RAM/ROM size, etc, enabling rapid identification of the right device for even the most demanding design. 

Again keeping the device availability up to date became an impossible task for a small company when there was no direct payback.

We still have the database and anyone with an 8051 search problem is welcome to write in to 

Embedded Newsletter
Get a copy of the embedded newsletter with news of all our embedded development tools.
Further Information

The Press Room

All COMSOL's Press Releases.

About our Website

Find out who is responsible for implementing the website, and the tools we used to do it.


Our consultancy projects , Y2K statement  and details of our  MIMIC  package.

Licenses and warrantees

We ship products from a number of suppliers - all of who have their own licensing and warrantee terms so we have attempted to centralise this information here.


Background information on these regulations and how COMSOL's products conform.

The Legal Page

With our Privacy Statement and Terms and Conditions of Sale


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