Stefan
FYI a C64 can read ZX Spectrum tapes out of the box https://www.c64-wiki.com/wiki/Spectrum_Simulator#Features
You don't have to write a filesystem from scratch, use a game DOS like https://atariwiki.org/wiki/Wiki.jsp?page=XBIOS.
FYI https://github.com/commanderx16/x16-emulator
Pretty cool! Of course there are some changes since August. Is there any download?
It also works in C64 mode, how about "?vdc"?
I prefer the REL approach. You don't have to manage the disk structure yourself, but let the DOS do it :-)
Do you mean it's not like "dw" and "dd"? Well, if you want a one keystroke also add the home key :-)
I have the same issue with NetBSD /usr/local/lib/fpc/3.2.2/units/x86_64-netbsd/rtl-objpas/strutils.ppu
An older macOS :)