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This page is a summary of all (at least all I can remember) programming projects I created or have had some major contribution.

How I started programming

It all started with buying a TRS-80 and meeting some people. Together we created Micro+Boek, later renamed to MiKroBoek, which has a page of its own here.

Micro+Film

Micro+Film was possibly the first program developed by me after Micro+Boek. MicroPlus passed me this client that needed a solution to track rentals of videos and games.

I haven't been able to locate any copies of the program, but I found some old pictures taken at our first client:

I remember that in those days wordprocessors (we had WordStar and some others) were only capable of fixed-pitch printing, line 10 or 12 characters-per-inch (CPI). But books and magazines were "typeset" with proportional fonts, where an "i" used less space than the letter "m" (like the text you're probably reading now on your screen).

At Micro+Plus we were selling converted typewriters as printers. They had "letter-quality" output, but were not capable of proportional printing and aligned texts.

I always faced problems as challenges, so one night I decided to solve this with a small program that could read WordStar documents and print them proportionally on a daisy-wheel printer or matrix-printer that was capable of proportional printing.

The next day I talked about the result at Micro+Plus, not thinking to much of it, since it was just a very crude bit of code, although it was working.

Management got very enthusiastic about it and this resulted in the product called "PS". We sold hundreds of copies of the program, which had a very simple interface. It was written in simple BASIC code. Versions were developed by me for CP/M and the first MS-Dos computers. Most were compiled with BASCOM. On the left you can see our original propaganda for the PS program.

Here you can find the source code (1988) in GWBasic for a Diablo 1610 Daisy Wheel printer.

CuliCom - Culinary Computer Software

This one I don't remember exactly how it started. I know Jan Wagemaker probably had the idea of creating some culinary software. I had a friend, Wim Konijn, who was a professional cook. 'Joining the ingredients' I wrote the software that could create combinations of entrees, main dishes and desserts for any occasion. The first version received some nice reviews and encouraged us to release special versions, but this never happened. This page is from a catalog of an editor that sold our software. Versions have been released for CP/M, MS-Dos, Macintosh, MSX and other systems.

This article on the right was published in the largest Dutch newspaper, de Telegraaf (I don't know the date) and shows a picture of Wim Konijn.

The original source code (1985) is here and you can download the complete program with all the options here.

HexEdit

Around the time I was working on the various PS versions, I felt need for a hexadecimal editor to make changes directly in the compiled code. This was in the eighties, when I was doing work in Z80 and 8080 assembler and using BASCOM to compile BASIC programs. Since nothing was available, I wrote my own editor, called HexEdit.

Being just something for internal use, we didn't keep the original source code. Older versions simply were overwritten with newer versions.

Afterwards I rewrote HexEdit and it still is alive here. It continues to be small (80K!) and simple but functional.

Screen

'Screen' was a very versatile database program written by a colleague (Peter) and later maintained by me. Basically with it you could design a "screen" with fields to fill in and store in a file, sorting and printing reports.

Update:

Recently I found some old backups and on one of them was the source code for Screen. I managed to get it running and captured some screenshots:

There is a lot more in this backup I will have to sort through...

B6 Bundelprograma

This program I wrote to organize 'bundles' of magazines in organized sequences of postal codes, depending on weight, following the rules defined by the Dutch postal service (PTT).

The first versions were written for the TRS-80 computers. Later versions were developed for MS-Dos.

'B6' was the name of one of the modules of the original TRS-80 version, when it was just called "Bundelprogramma".Back to top

MiKroBoek 'offspring'

Through the success of MiKroBoek we created many related programs for special purposes. (note: the names might have changed during the years. For example: HN-Film has been known as HS-Film as well)

Some examples:

Name	Description
HN-Film	Administration of photographic laboratories, integrated with financial administration
HN-Bon	General delivery program, integrated with financial administration
HN-Order	Order administration for the graphic industry, integrated with financial administration
HN-Camping	Possibly the biggest offspring, sold to several camping-sites and hotels over the years. This package has managed thousands of reservations per year, with manu intelligent options and complete integration with the financial administration. It actually deserves a page of its own, if time permits...
SaMBa	SaMBa has been a venture with ABI in Atlanta to launch our program in the United States as a solution for Small and Medium Business administration

I captured some screenshots of SaMBa. It looks quite similar to MiKroBoek 88 as you can see here.

'Lichtsystemen'

In a joint-venture with another company, I wrote a complete system for a company specialized in lightsystems. For judicial reasons, I cannot elaborate too much, but let's say this was not a complete financial success.

The program was written in Clipper (!) and I still have some snippets of source code here.Back to top

Threadtest

Once I was called to evaluate a problem that was occuring at one of our biggest clients in Brazil.

Situation: On peak-days, hundreds of client-applications would connect simultaneously to the server, aparantly overloading the application. One thing called my attention: the application opened a thread for every external connection. Having experience with Windows, I knew this could cause quite some overhead.

As always, I created a program to stress the system. The result is available for download here. Just execute the program in a DOS-Box as "ThreadTest xxx", where xxx = the number of threads to start.

This page: ? Copyright by Niels Horn - Rio de Janeiro - Last modified: September 21 2009 08:56:04.