The Pascal compiler uses the math48 floating point library written in Z80 assembly by Anders Hejlsberg, inventor of Turbo Pascal, presumably in his pre-Borland time. It provides the foundation for the Real data type.

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                  Floating Point Package Math48
         Version 1.1 Revision 1 by Anders Hejlsberg 1718 Bytes
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     48 bit floating point mathematicspackage for Z-80 based microcomputers
     Copyright (C) 1980 Blue Label Software (Later known as Borland)

Unfortunately, the library source code does not contain any license or permission to use. It would be super-helpful for this project (but also for numerous others, mostly compilers, of course) if permission could be given to use the library or - even better - if the library could be released under some kind of open source license. It would also help preserve an interesting artifact of computing history.

The version of the library that the project is using can be found in the rtl folder of the repo. It is accompanied by an English translation of the original danish manual.