Subj : Re: Dos
To   : Dale Shipp
From : Sean Dennis
Date : Sat Feb 25 2023 14:21:11

-=> Dale Shipp wrote to Sean Dennis <=-

 DS> I did know that DOS programs had a drop dead date.  Is it some sort of
 DS> cousin to the Y2K problem?  I am using a number of DOS programs on my
 DS> WIN10 system using vDOS.  Do you know if those programs should still
 DS> work?  Not that it matters a lot to me personally since I will be
 DS> pushing to almost 100 by then, if still above ground.

It seems I am wrong (or my memory is faulty which is more likely):

  - Function 2Ah (“Get Date”) offered by INT 21h on DOS returns a 
“year”
    field between 1980 and 2099.

  - GetSystemTime() in the Windows WIN32 API returns a value between the
    years 1601 and 30827.

  - FAT timestamps range between January 1, 1980 and December 31, 2107.

  - NTFS timestamps range between January 1, 1601 and May 28, 60056.

  - UNIX and UNIX-like systems traditionally use the number of seconds
    passed since January 1, 1970, stored as a signed 32-bit value, for all
    APIs.  The rollover will not happen before January 19, 2038, when the
    counter jumps back to December 13, 1901 (if the system can handle
    negative values correctly, which isn’t a given). [Most 64-bit *NIX
    systems have a solution for this already.]

However, some DOS programs use a 16-bit signrd integer to hold the date and
that will cause issues.

This webpage does a deep dive into this subject (and if you program and
understand it, it's really interesting): https://tinyurl.com/4k99tutt

MMMMM----- Recipe via Meal-Master (tm) v8.06
 
      Title: A-Maize-Ing Chowder
 Categories: Soups, Low-fat, Lunch
      Yield: 4 Servings
 
      1 c  Sliced leek or onion
      1 c  Sliced carrot
      1 sm Baking potato cubed
      1 c  Defatted chicken broth
      2 c  Evaporated skim milk
      1 c  Frozen whole kernel corn
      2 tb Chopped parsley
           Salt & pepper to taste
 
  1. In medium saucepan, combine leek, carrot and potato with chicken
  broth. 2. Cover and simmer 10 minutes or until vegetables are tender.
  3. Puree then add milk and corn. Heat without boiling, to serving
  temperature. 4. Season to taste with salt and pepper. 5. Serve
  sprinkled with parsley.
 
MMMMM
 
- Sean

.... Don's Axiom: when all else fails, read the instructions.
--- MMail/FreeBSD
 * Origin: Outpost BBS * Johnson City, TN (1:18/200)

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