DOS ain't dead

21.33FF kernel version string interface (Developers)

posted by rosegondon, C:\DOS, 17.01.2022, 20:06

> > > I am looking for a method of detection of running FreeDOS kernel
> >
> > set ax=0x3000 and call int 0x21, check whether the returned bh is 0xfd.
> >
> > if yes, set ax=0x33ff and call int 0x21, it returns a pointer dx:ax to a
> > version string.
> >
> > how to express this in the programming language of your choice is up to
> > you, please share an example implementation code snippet here
>
> Here's an example for the latter call in 8086 NASM assembly:
> callver.asm
>
>
> mov ax,33ffh    ; get FreeDOS version string pointer
> xor dx, dx
> int 21h               ; returns DX AX
> test dx, dx
> jnz gotname
> mov dx, ds
> mov ax, msgnoname
>
>
> The returned pointer is an ASCIZ string that may have trailing whitespace
> (such as CR or LF). There is some code following the quoted part that will
> ignore trailing whitespace.

How to get this version string in Pascal?

---
echo g=ffff:0|debug>nul

Complete thread:

• How to detect FreeDOS kernel from Turbo Pascal program? - rosegondon, 14.01.2022, 22:39 (Developers)
  • How to detect FreeDOS kernel from Turbo Pascal program? - mceric, 15.01.2022, 00:22
    • How to detect FreeDOS kernel from Turbo Pascal program? - rosegondon, 15.01.2022, 16:20
      • How to detect FreeDOS kernel from Turbo Pascal program? - Rugxulo, 19.01.2022, 01:05
    • 21.33FF kernel version string interface - ecm, 15.01.2022, 17:32
      • 21.33FF kernel version string interface - rosegondon, 17.01.2022, 20:06
        • 21.33FF kernel version string interface - DosWorld, 18.01.2022, 02:54
          • 21.33FF kernel version string interface - rosegondon, 18.01.2022, 09:06
            • 21.33FF kernel version string interface - Laaca, 18.01.2022, 14:25
            • 21.33FF kernel version string interface - tkchia, 18.01.2022, 15:30
            • 21.33FF kernel version string interface - DosWorld, 18.01.2022, 16:44
              • 21.33FF kernel version string interface - rosegondon, 18.01.2022, 19:14
    • How to detect FreeDOS kernel from Turbo Pascal program? - Laaca, 18.01.2022, 19:06
      • How to detect FreeDOS kernel from Turbo Pascal program? - Rugxulo, 19.01.2022, 00:57
        • How to detect FreeDOS kernel from Turbo Pascal program? - Laaca, 19.01.2022, 10:33
  • How to detect FreeDOS kernel from Turbo Pascal program? - Oso2k, 15.01.2022, 00:24
  • How to detect FreeDOS kernel from Turbo Pascal program? - Laaca, 15.01.2022, 11:09
    • How to detect FreeDOS kernel from Turbo Pascal program? - mceric, 15.01.2022, 12:29