Thinking about Wirth


"Frank Hamersley" <terabitemightbe@xxxxxxxxxxx> wrote in message
news:wGZ4g.19486$vy1.11903@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Tony D wrote:
Ha ! I'll top that with a "Pascal Implementation: The P4 Compiler" two
(slim) volume set - one of the source code to the Pascal P4 compiler
and interpreter (written in Pascal, of course !) and the other a
discussion of that source.

I'm sure I remember a professor explaining that Pascal's text file
handling was like *that* so that it was possible/easy to write Pascal
compilers in Pascal, and that the first compiler for the CDC was
compiled by printing out two sets of the source code, laying them on
the floor side by side and manually running one with the other as input
....

I am trying to imagine this! I used to know the entire CDC instruction
set including addressing modes by sight (there weren't that many of
either) and I thought they would have prolly written a small bootstrap
compiler in Assembler or Fortran IV to get going.

We did use Pascal first on a CDC Cyber 73 (FWICR) but by the time I got
to the final undergrad year the prof had got Modula-II running on the
PDP-11 (with cross compilation to the LSI-11) so our "Pascal" activities
were curtailed.


The first Pascal I ran accross was on the VAX. I was migrating from the
DECsystem-10, so I was in search of an easy language. I messed around with
Pascal a little and decided that I really liked it. I especially liked the
user manual written by Kathleen Jensen.

Then I got to attend a one week seminar for DEC employees, entitled "Pascal
as aSecond Language", taught by Kathleen Jensen. It was excellent!

The down side of learning VAX Pascal is that I never did learn the VAX
debugger, the way I knew the DEC-10 dbugger, DDT.

The second Pascal I ran across was Borland's Turbo Pascal. An outstanding
buy, at the time (1983).




.

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