Questions tagged [pascal]

For questions regarding the use or installation of the Pascal language on retrocomputers.

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38
votes
4answers
12k views

Where does this esoteric Pascal operator come from?

In the documentation for an implementation of Pascal for a Soviet computer, I've encountered a very weird language extension. I'll try to translate it: Branching operator (branch) Syntax &...
16
votes
4answers
3k views

Why does Pascal have numeric labels?

Pascal was intended, in part, to be a simple language to implement. Some of the design decisions reflecting this are Declarations/definitions must be given in a strict order (labels, constants, types,...
7
votes
1answer
1k views

Was there a bug in Wirth's original Pascal compiler?

It appears that both legacy Pascal compilers I have access to (for the BESM-6) contain a bug: they would happily produce code for program test(output);(* may have to omit (output) depending on the ...
6
votes
0answers
193 views

Was there another dialect of Pascal with this range checking feature?

I've decompiled yet another Pascal compiler for the BESM-6. While it does not implement the full language (for example, packed records and arrays are not implemented, helper routines SEL and INS are ...
5
votes
1answer
837 views

Looking for the source code of a sophisticated Pascal pretty-printing program

I'm trying to find a 70s or very early 80s source code of a Pascal pretty-printing program which is more advanced than the version mentioned on the Prettyprint wiki page which is undated and somewhat ...
9
votes
1answer
2k views

Is this a bug or an allowed Pascal behavior?

Consider the following Pascal program: 1 1 PROGRAM MAIN(OUTPUT); VAR F:TEXT; I:INTEGER; 2 2 BEGIN 3 2 REWRITE(F); 4 3 FOR I := 10 TO 30 DO BEGIN 5 3 WRITELN( I, ’...
95
votes
1answer
28k views

Why did MS-DOS applications built using Turbo Pascal fail to start with a division by zero error on faster systems?

On faster MS-DOS systems, it wasn't entirely uncommon for applications built using Borland's Turbo Pascal to fail to start, and (before exiting back to the command prompt) to report a division by zero ...
33
votes
5answers
7k views

Why was nil defined as a reserved word in Pascal?

In Pascal, nil (the pointer value to "nothing") is a reserved word. Why wasn't it simply a predefined identifier as true and false are, for example? This is stated in PASCAL User Manual and Report p....
6
votes
1answer
253 views

Cross-Compatibility of UCSD p-Machine Versions?

I currently have Apple Pascal (and Fortran, and PILOT) running on an Apple IIgs emulator on Windows. As near as I can tell, it's UCSD p-System II.something. I also have a DOS-hosted UCSD p-System, IV....
11
votes
1answer
539 views

How much time and how many people were required to develop Delphi version 1?

I would guess the compiler was primarily a modification of Borland's Turbo Pascal, while the Integrated Development Environment and Visual Component Library required a lot more development from ...
19
votes
6answers
4k views

What caused the downfall of Pascal? [closed]

From 1985 to 1990 Borland's Turbo Pascal was at least as popular as C for DOS systems. Turbo Pascal was especially popular because of it's ground breaking BGI graphics interface while C was stalled in ...
5
votes
1answer
305 views

Was dynamic type check in Pascal commonplace?

The BESM-6 Pascal compiler I'm experimenting with has a notable difference from Standard Pascal: formal arguments of formal parameters-procedures or functions are not specified, but are checked at ...
30
votes
3answers
8k views

Was Dennis Ritchie being too modest in this quote about C and Pascal?

In his 1993 conference proceeding The Development of the C Language, Dennis Ritchie stated Successors C and even B have several direct descendants, though they do not rival Pascal in ...
2
votes
1answer
318 views

How to transfer file from one disk to another in Apple //e (Applewin)

For the nostalgia, I'm going through Apple Pascal - A Hands-on Approach using AppleWin. There are four disks, pascal0 through pascal3, and for some reason pascal0 is missing a file called SYSTEM....
6
votes
2answers
402 views

Why is the following p-Code generated by the Apple 3 pascal compiler?

On an Apple 3 the following pascal function function randu( High: integer): integer; begin randu:= random mod High end; will be translated to Proc = 06 Typ = P-Code codeBeg = 02A6 Exitcode=...
36
votes
3answers
5k views

What was the point of Apple Pascal having its own file system?

Apple's UCSD Pascal for the Apple II used its own file system rather than the existing DOS 3.3 of the day. I'm not sure if it overlapped SOS at all, but regardless of timelines it seems that the ...
6
votes
3answers
927 views

When were the analogs of the C operators "break" and "continue" introduced in Pascal?

When published in 1970, the Pascal language did not have a way to implement the functionality equivalent to the (future) C language operators "break" and "continue". Their convenience having been ...
17
votes
3answers
1k views

x86 as a Pascal Machine?

From this answer by gsg about the usage of certain x86 instructions: Note that the x86 was originally designed as a Pascal machine, which is why there are instructions to support nested functions (...