Fred logo - Profession

Spammers and lawyers


Since 1970 I'm professionally occupied with a lot of different tasks in the information and communication technology. That combination of those different tasks makes for me this profession so attractive. Although I have been able to skip some aspects like desktop automation (think of desktop computing with MacOS, DOS and Windows) en salary administration. In the latter case people aren't happy with even minor errors ;-).

Some people have faces problems in their private live because of the long working hours in the ICT business. Because my wife works already longer in this business than I do I've not faced such problems.

My desktop computers.

My desktop computers are running GNU/Linux since 1997 with an ever changing variety of desktop environments and window managers. Just because I prefer choice. Before 1997 I didn't use a desktop computer but terminals connected to mainframes and UNIX computers. For this reason I really question why so many people were talking about "Linux on the desktop is dead" in the year 2001. And before I forget, all the laptop computers here are happily running GNU/Linux too.

Short overview of hardware and operating systems.

1970-1976 CVI (automation company of the Dutch Railways)
  • Siemens 4004 mainframes with TDOS en DOS
  • IBM 1130 minicomputer for technical and scientific use
  • IBM 360 with DOS
  • Siemens 7700 mainframes with BS1000
  • Siemens 7500 mainframes with BS2000
1976-1979 Freelance, after my wife started her own business.
  • Bull DPS/64 with GCOS/64
  • Bull DPS/7 with GCOS/7
1980-now Bundling our activities in Systemhouse Mobach bv.
  • Siemens 7500 and newer with BS2000
  • Siemens RMx00 with SINIX / Reliant UNIX
  • Bull DPS/7 with GCOS/7
  • Bull DPS/8 with GCOS/8 (UNIX)
  • HP-3000 with MPE
  • ICL ME-29
  • Sun Ex00 with Solaris
  • IBM RS/6000 with AIX

Short overview - projects.

Smaller projects and programming languages like Algol, C and RPG are omitted. Also about security related projects not so much can be said as that would in general make the customers a little bit unhappy.

Optimization of the statistical program for railway usage of the Dutch Railways. The change of some field definitions from DISPLAY to binary format saved because of the big tables much memory and because of the disappearance of the data format conversions a lot of cpu instructions.
IBM's DOS for 360 extended with a dump routine, that saved a boot cycle after execution of every dump.
Statistical system for the processing of (mostly sociological) inquiries.
Central Member Administration for AVEBE.
Together with Du Prie DP Engineering this 4GL further developped and maintained. This 4GL supports the development and maintenance phases of applications. With this tool build systems are running for about 20 years on quite different systems like Siemens BS2000, IBM mainframes and UNIX.
A MIS (Management Information System) for Marketing and Sales of AVEBE. The system consisted of central and decentral components.
makes the use of remote printers from Siemens BS2000 mainframes possible, with a mainframe and a pc component.
(COBOL en Assembler)
The former MTPM is a transaction processing monitor (think CICS) for Siemens BS2000 systems. It supports multiple user applications in different user environments (user id's).
(COBOL en Assembler)
The Data Distribution System, with which any type of data in a planned way can be distributed under the control of the application administrator. The transmission initiative can be at the server side as well as the client side.
(COBOL en Assembler)
A prototype of a heavily optimized FORTRAN compiler, thus reading FORTRAN sources and generating Assembler code. The results saved the customer about 50 % of the cpu cycles. You can find the sourcecode here as forass.cbl.gz. It is available under the GNU General Public License (GPL).

  Last change at 2001-12-03 by Fred Mobach <> Copyright © 2001 Fred Mobach  
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