Frotz 2.52 for 16-bit MS-DOS incorrectly displays accents

Launching Frotz 2.52 for 16-bit MS-DOS with a z3 program containing :

print "@:a @:o @:u @:A @:O @:U @ss @<< @>> @:e @:i @:y @:E @:I @'a @'e @'i @'o @'u @'y @'A @'E @'I @'O @'U @'Y @`a @`e @`i @`o @`u @`A @`E @`I @`O @`U @^a @^e @^i @^o @^u @^A @^E @^I @^O @^U @oa @oA @/o @/O @~a @~n @~o @~A @~O @~N @ae @AE @cc @cC @th @et @Th @Et @LL @oe @OE @!! @??";

there are several characters that are not displayed correctly, namely : @:E @:I @’y @'A @'I @'O @'U @'Y @`A @`E @`I @`O @`U @`Y @^A @^E @^I @^O @^U @/o @/O @~a @~o @~A @~O @th @Th @et. See attached picture.

I'm no expert on MS-DOS and maybe it's a problem with my dosbox config, but it seems odd that some characters would work but not others, especially since it's not that some are matching the Latin-1 table and not others. There must be a translation table (latin1tozscii, iirc! ?) that has mistakes.

Capture_d_écran_2021-01-20_10-20-18

Edited by H Labrande