That is also with Turbo Pascal, several years ago
Viewing post in TIR - Truck strategy Game for MS-DOS comments
Well, it was 24 years ago... :)
But I was digging into the remained source files, and found a VESAdrv and a pcx file reader unit with in-line assembly codes. Definetely I was not the one who developed them but made some slight changes on it for sure during a summer vacation that time. :)
But I do not really understand it anymore... :)