Am Dienstag, 14. Dezember 2021, 15:38:16 CET schrieb Marc Rintsch: > On 14.12.21 13:48, groepaz_at_gmx.net wrote: > > Am Dienstag, 14. Dezember 2021, 13:37:25 CET schrieb Marc Rintsch: > >> On 14.12.21 11:23, groepaz_at_gmx.net wrote: > >>> ehrm. USR is exactly the same as PRG and SEQ, the only difference is one > >>> byte in the directory entry. They werent *that* uncommon either :) > >> > >> The DOS treats them the same, but many USR files are not written by the > >> DOS. GEOS VLIR files are USR and structured not like PRG and SEQ. > > > > And you can do exactly the same with PRG or SEQ (and there exist program > > that do). I wouldnt say "many are not written by the DOS" either - do you > > have another example than GEOS? :) What GEOS does isnt really "USR files" > > either, its just tagging a directory entry with USR - to the DOS those > > arent even > Of course you can do that with PRG/SEQ too, but you are not supposed to. > With USR on the other hand I always had the impression those are meant > to ”go wild” like GEOS did. „Inside Commodore DOS“ says „A user file > may have the structure of either a sequential file or a program file if > it was created by the DOS. It may be structured entirely differently if > it was created using direct-access techniques described in Chapter 5.” > > If there are USR files on a disk I'm cautious about making any > assumptions about the structure unless I know for sure which program has > written them/if this is a GEOS disk. "what you are supposed to do" isnt really a good measure 30+ years after everyone did whatever he wanted =) as said, USR has been used for regular files just like PRG (or DEL) was used for random custom things. -- http://hitmen.eu http://ar.pokefinder.org http://vice-emu.sourceforge.net http://magicdisk.untergrund.net Ein Abend, an dem sich alle Anwesenden einig sind, ist ein verlorener Abend. <Albert Einstein>Received on 2021-12-14 18:00:01
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