Per Brinch Hansen pages updated

After the scan of Brinch Hansen on Pascal compilers I went on and also scanned the book on Edison: Programming a Personal Computer.

The Per Brinch Hansen now are updated too, the Alfred Hartmann book on Concurrent Pascal added, the Software: Practice and Experience issue on Edision scanned and converted, all articles by per Brinch Hansen listed. Enjoy the works of one of the pioneers: simplicity and parallel programming Per Brinch Hansen!


Edsger Dijkstra

Page on Edsger Dijkstra has seen an update, Books and such on this amazing scientist, who lived in Nuenen long time ago, 10 km from where i live now. Last time I have seen him was in 1980 in Utrecht, where he gave a speech together with Niklaus Wirth and Tony Hoare at the University.


UCSD p_system updated

The UCSD p-System part of the site has been enhanced with all I had in my archive. This descendent of the P2 compiler, initiated by Ken Bowles and his students at UCSD, had a big impact around 1980 as a full operating system and with programming languages (Pascal, Fortran, Basic, Modual-2, Ada) in a well-supported portable way. A forerunner of Java, running on small computers like the Apple ][ and CP/M systems. The simple text based user interface and the p-code interpreter were strong points, but were later a disadvantage when native systems and compilers and GUI’s took over. Around 1985 the commercial impact was gone.

Many books, disk images etcetera.

The MS-DOS hosted p-system Supplement book has been scanned by me, the first time!

1978 KIM-1 Pascal-M

KIM-1 Pascal-M 1978 interpreter

Short userguide

0. You need two cassette recorders under Micro Ade software control, see Micro Ade userguide how to read, one to write.
1. Load Micro-Ade (Pascal-M version)
2. In Micro Ade write a Pascal program (remember V1: only uppercase!) and save to tape, standard Micro Ade actions
Every source line is stored as separate file on tape by Micro Ade.
3. Compile on the KIM-1 after reset.
a. Load binaries:
– load interpreter zero page and interpreter $2000
– load Pascal compiler
– load Pascal compiler procedure buffer (at $0200)
b. Start compilation with $2003 G
The compiler will now load the source from reading cassette (see step 2),
and compile to Pxx object record, saved on the recording cassette.
Any errors are flagged on the console, reading continues until the end of the source.

4.If no errors reported the object file is ready for execution. reset the KIM-1.
– Insert the written cassette in the reader.
– Load interpreter and zero page if the KIM-1 has been switched of.
Start the interpreter with 2000G
5. The object code will be read from tape.
When loading is finished and no checksum errors are reported the interpreter prints: <program name> LOADED
6. Start the program with 2003 G


Pascal-M 1978 Cross compiler

The original 1978 version of Pascal-M, a P2 descendent, has been restored. Original source, which can compile itself, is now available, as a cross compiler, an interpreter in Pascal with debugging facilities, a binary loader for the KIM-1 6502 interpreter and a disassembler for M-code. Together with the already available source of the KIM-1 V1 interpreter all parts of the 1978 compiler are now available in source and compiled/assembled format.

Though compiling itself is a very good test of the compiler, which showed many bugs from typing in and some original present bugs, not too much testing has been done.

I start working now on V1.5 of the cross compiler and leave this V1.0 version as ‘completed’ and ‘historical purposes’.


Wirth and more: large update

A large update to my history of Pascal and its standards, where it comes from, the early compilers, sources of first compilers, unique articles and rare books, originally scanned, written by Niklaus Wirth, Per Brinch Hansen, Tony Hoare, Dijkstra, Jim Welsh and many more. Enjoy!