DOS ain't dead

SEEKEXT and enabling unsigned 32-bit DOS int 0x21 fileseeks? (Users)

posted by Zyzzle, 22.10.2021, 02:45

> Are you talking about R. Loew's FILE64 package?
>
> https://rloewelectronics.com/distribute/FILE64/FILE64W/README.TXT

Yes, and also his XFILE utility. But, apparently these don't patch DOS directly. I do not believe he made a general patch for IO.SYS which on-the-fly 'translates' negative signed 32-bit filelengths into unsigned lengths. Dealing with the special case of "-1" as the only valid negative filesize. That's what FILE64 does, but only in a Win32 environment, to enable FAT32 file sizes > 4 GiB. But, only for Windows, and apparently not for straight 16-bit DOS, unless I've missed something...

Complete thread:

• SEEKEXT and enabling unsigned 32-bit DOS int 0x21 fileseeks? - Zyzzle, 20.10.2021, 05:00 (Users)
  • SEEKEXT and enabling unsigned 32-bit DOS int 0x21 fileseeks? - Rugxulo, 20.10.2021, 11:10
    • SEEKEXT and enabling unsigned 32-bit DOS int 0x21 fileseeks? - Zyzzle, 20.10.2021, 14:37
      • SEEKEXT and enabling unsigned 32-bit DOS int 0x21 fileseeks? - KormaX, 25.11.2021, 17:42
  • SEEKEXT and enabling unsigned 32-bit DOS int 0x21 fileseeks? - ecm, 20.10.2021, 12:50
    • SEEKEXT and enabling unsigned 32-bit DOS int 0x21 fileseeks? - Zyzzle, 20.10.2021, 14:51
      • SEEKEXT and enabling unsigned 32-bit DOS int 0x21 fileseeks? - Oso2k, 22.10.2021, 00:39
        • SEEKEXT and enabling unsigned 32-bit DOS int 0x21 fileseeks? - Zyzzle, 22.10.2021, 02:45
    • SEEKEXT and enabling unsigned 32-bit DOS int 0x21 fileseeks? - KormaX, 26.11.2021, 10:31