COPILOT : Programming pascal memory resident text message sample code

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Programming pascal memory resident text message sample code

Here's a sample code for a memory-resident program in Pascal that displays a text message periodically:

pascal

program MemoryResidentMessage;

uses
  Dos, Crt;

var
  OldInt08: Pointer;
  Counter: Integer;

procedure NewInt08; interrupt;
begin
  // Increase the counter
  Inc(Counter);

  // Every 18 ticks (approximately every second)
  if Counter >= 18 then
  begin
    Counter := 0;

    // Save current cursor position
    asm
      mov ah, 2
      int $10
    end;

    // Set cursor position to top-left
    GotoXY(1, 1);

    // Display the message
    Write('Hello from memory-resident program!');

    // Restore cursor position
    asm
      mov ah, 2
      mov bh, 0
      mov dh, 0  // row
      mov dl, 0  // column
      int $10
    end;
  end;

  // Call the original interrupt handler
  asm
    pushf
    call dword ptr OldInt08
  end;
end;

begin
  // Save the old interrupt vector and set the new one
  GetIntVec($08, OldInt08);
  SetIntVec($08, @NewInt08);

  // Initialize the counter
  Counter := 0;

  // Keep the program resident in memory
  Keep(0);
end.

Here's a brief explanation of the code:

1. OldInt08: This variable stores the pointer to the original timer interrupt handler.

2. NewInt08: This is the custom interrupt handler that gets called approximately 18 times per second. It increments a counter and, once per second, it displays a message at the top-left corner of the screen.

3. GetIntVec and SetIntVec: These procedures get and set the interrupt vector for the timer interrupt.

4. GotoXY: This procedure sets the cursor position for text output.

5. Keep: This procedure keeps the program resident in memory.

Feel free to customize this code to fit your needs. If you have any questions or need further modifications, just let me know! 😊