Turbo Pascal 3 //top\\
The technical achievements of Turbo Pascal 3 are staggering by modern standards. Written entirely in assembly language by Anders Hejlsberg (who later created Delphi, C#, and TypeScript), the software was a masterpiece of optimization. Microscopic Footprint
In the era of 256KB to 640KB of RAM, memory was gold. TP3 introduced —a way to write programs larger than available memory. Code could be structured into "overlays" that loaded from disk only when needed, swapping in and out automatically. This allowed complex, professional applications (like spreadsheets or word processors) to be written in Pascal.
What Is Turbo Pascal? History, Features, and Programming Uses turbo pascal 3
Version 3.0 introduced significant advancements in graphics support, particularly for the IBM PC:
Enthusiasts often ask: Why glorify specifically? Why not version 4 or 5? The technical achievements of Turbo Pascal 3 are
Released in 1986, Turbo Pascal 3 was a marvel of efficiency. The entire program—including the compiler and the text editor—was a mere 39,731 bytes
Borrowed from the Logo language, this made it incredibly easy for beginners to draw shapes and learn the logic of geometry through code. TP3 introduced —a way to write programs larger
Turbo Pascal offered structured programming, making it easier to manage large codebases compared to the line-numbered, "spaghetti code" nature of BASIC.
It compiled code directly into memory or executable .COM files incredibly fast.
Read about the between Borland and Microsoft. Share public link

Hello Thom
Serenity System and later Mensys owned eComStation and had an OEM agreement with IBM.
Arca Noae has the ownership of ArcaOS and signed a different OEM agreement with IBM. Both products (ArcaOS and eComStation) are not related in terms of legal relationship with IBM as far as I know.
For what it had been talked informally at events like Warpstock, neither Mensys or Arca Noae had access to OS/2 source code from IBM. They had access to the normal IBM products of that time that provided some source code for drivers like the IBM Device Driver Kit.
The agreements with IBM are confidential between the companies, but what Arca Noae had told us, is that they have permission from IBM to change the binaries of some OS/2 components, like the kernel, in case of being needed. The level of detail or any exceptions to this are unknown to the public because of the private agreements.
But there is also not rule against fully replacing official IBM binaries of the OS with custom made alternatives, there was not a limitation on the OS/2 days and it was not a limitation with eComStation on it’s days.
Regards
4gb max ram WITH PAE! nah sorry a few frames would that ra mu like crazy. i am better off using 64x_hauku, linux or BSD.
> a few frames would that ra mu like crazy
I am not sure what you were trying to say. I can’t untangle that.
This is a 32-bit OS that aside from a few of its own 32-bit binaries mainly runs 16-bit DOS and Win16 ones.
There are a few Linux ports, but they are mostly CLI tools (e.g. `yum`). They don’t need much RAM either.
4GB is a lot. I reviewed ArcaOS and lack of RAM was not a problem.
Saying that, I’d love in-kernel PAE support for lots of apps with 2GB each. That would probably do everything I ever needed.