The address calculation was wrong, as the addition of the lower 16 bits
is a signed addition, so if bit 15 is set, the upper 16 bits need to be
incremented by one (so the hi portion of the symbol always references
the symbol + 0x8000).

Thanks to Marek Mahut for the translation.

Thanks to Mauricio Teixeira <mteixeira@webset.net> for the translations.

Thanks to Mauricio Teixeira <mteixeira@webset.net> for the translations.