Free Pascal (FPC) for older systems - Intel x86 (16 and 32 bit), AMD64/x86-64, PowerPC, etc.

https://www.freepascal.org/

"Free Pascal is a mature, versatile, open source Pascal compiler. 

It can target many processor architectures: Intel x86 (16 and 32 bit), AMD64/x86-64, PowerPC, PowerPC64, SPARC, SPARC64, ARM, AArch64, MIPS, Motorola 68k, AVR, and the JVM.

Supported operating systems include Windows (16/32/64 bit, CE, and native NT), Linux, Mac OS X/iOS/iPhoneSimulator/Darwin, FreeBSD and other BSD flavors, DOS (16 bit, or 32 bit DPMI), OS/2, AIX, Android, Haiku, Nintendo GBA/DS/Wii, AmigaOS, MorphOS, AROS, Atari TOS, and various embedded platforms."

https://wiki.freepascal.org/

"Downloads

• The official releases of the Free Pascal Compiler, source code and documentation can be downloaded from the Free Pascal site.
• See Installation Instructions and Release Notes."

"Free Pascal Compiler (FPC) is a compiler for the closely related programming-language dialects Pascal and Object Pascal."  https://en.wikipedia.org/wiki/Free_Pascal

"It supports its own Object Pascal dialect, as well as the dialects of several other Pascal family compilers to a certain extent, including those of Borland Pascal (named "Turbo Pascal" until the 1990 version 6), Borland (later Embarcadero) Delphi, and some historical Macintosh compilers. The dialect is selected on a per-unit (module) basis, and more than one dialect can be used per program."

Free Pascal Compiler - Open source professional Pascal compiler:  https://github.com/fpc