DOS ain't dead

Device drivers: Changing the attribute word at install time? (Developers)

posted by tkchia , 03.10.2023, 21:28

Hello mbbrutman, hello ecm,

> For me I'm interested in bit 1 which indicates if 32 bit block addressing
> is available. This makes sense for DOS 5 but not for older versions of
> DOS.

What happens if you set attribute bit 1 unconditionally?

As far as I can tell from Microsoft's source code release (https://github.com/microsoft/MS-DOS), it seems that MS-DOS 2.x only cares about bit 1 for character devices — in which case it says whether the device is the default stdout. Perhaps you could simply set bit 1 for a block device driver and get away with it.

Thank you!

---
https://gitlab.com/tkchia · https://codeberg.org/tkchia · 😴 "MOV AX,0D500H+CMOS_REG_D+NMI"

Complete thread:

• Device drivers: Changing the attribute word at install time? - mbbrutman, 02.10.2023, 23:47 (Developers)
  • Device drivers: Changing the attribute word at install time? - glennmcc, 03.10.2023, 03:43
  • Device drivers: Changing the attribute word at install time? - mbbrutman, 03.10.2023, 20:21
    • Device drivers: Changing the attribute word at install time? - ecm, 03.10.2023, 20:56
      • Device drivers: Changing the attribute word at install time? - mbbrutman, 03.10.2023, 21:26
        • Device drivers: Changing the attribute word at install time? - tkchia, 03.10.2023, 21:32
          • Device drivers: Changing the attribute word at install time? - mbbrutman, 03.10.2023, 22:48
          • Device drivers: Changing the attribute word at install time? - tom, 04.10.2023, 23:43
  • Device drivers: Changing the attribute word at install time? - tkchia, 03.10.2023, 21:28
    • Device drivers: Changing the attribute word at install time? - mbbrutman, 03.10.2023, 22:51
      • Device drivers: Changing the attribute word at install time? - bretjohn, 06.10.2023, 21:35
        • Device drivers: Changing the attribute word at install time? - mbbrutman, 07.10.2023, 20:42
          • Device drivers: Changing the attribute word at install time? - bretjohn, 09.10.2023, 19:17
            • Device drivers: Changing the attribute word at install time? - mbbrutman, 02.11.2023, 19:39
  • Device drivers: Changing the attribute word at install time? - Rugxulo, 23.11.2023, 22:15