https://copilot.microsoft.com/chats/YWY1mqSpDMwSuGN9vQ9Pe
Creating a memory resident program in Pascal can be a bit tricky, as it involves low-level programming. Such programs stay in memory even after they have finished executing, allowing them to perform tasks or respond to events while other programs are running.
Here's a simplified example of a memory-resident Pascal program using Turbo Pascal:
program MemoryResidentProgram;
uses
Dos;
var
OldInt09: Pointer;
procedure MyInt09Handler; interrupt;
begin
{ Custom interrupt handler code here }
Inline($9C); { PUSHF instruction to save flags }
{ Call the old interrupt handler }
asm
call OldInt09
end;
end;
begin
{ Save the old interrupt vector }
GetIntVec($09, OldInt09);
{ Set the new interrupt vector }
SetIntVec($09, @MyInt09Handler);
{ Keep the program in memory }
Keep(0);
end.
In this example:
OldInt09
holds the address of the original interrupt handler.MyInt09Handler
is the new interrupt handler for interrupt 9 (keyboard interrupt).GetIntVec
andSetIntVec
are used to save the old interrupt vector and set the new one, respectively.Keep(0)
is used to keep the program resident in memory.
You might need to customize the interrupt handler to perform specific tasks, depending on your requirements. Also, make sure to test thoroughly, as dealing with low-level operations can be prone to errors and can affect system stability.
Feel free to ask if you need further details or if there's something specific you want to achieve with your Pascal program!
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