Hmmm, noone? Okay, then I will try solving my issue using VBDOS. Which imho is still similar enough to QBasic to meet my purpose of having fun writing an interpreter in a classic BASIC language.

Keep in mind, you are using an interpreted language, to run an interpreted language.

Consider using QB7.1, and "Compiling" it. This removes the "Interpreter" overhead handling QuickBasic.

Also, "Print" commands are.... Abysmally slow. A math loop can execute dozens of times in the same clock cycle it takes to do a single print statement. Try VERY hard to avoid using Print to write to the screen. Basically *ALL* of QB's graphics functions are painful slow. This is why many 3rd party libraries with inline assembler exist for it. 😜

I'm tempted to encourage you to write this in Forth, but I'm afraid you probably don't program in Forth? 😉

If I felt like I had the time and energy to learn Forth I might actually feel tempted to do it just to prove a point. 😀

QB 7.1 eh? If vbdos doesn't work out that is a possibility.

Okay, the interpreter has been ported it to vbdos. Memory management has improved. However it is still slow! 😀

Link:
https://github.com/PeterSwinkels/vbd...ck_Interpreter

with a quick look - its lots of string things in QB and likely slow for reasons relating to QB itself, interpreted or compiled

with smaller programs i sometimes try to implement the same approach with another tool, for instance c in this case, partly to test the tool and partly to see if doing it again yields any insights i missed first time. it's a thought anyway

Well, I am going to try porting to PowerBASIC this time. (When I feel I have the time and energy and other priorities don't get in the way.)

With pb's quirks this is gonna be fun! 😀

https://www.vbforums.com/showthread.php?90243 … 298#post5630298

The last post by me in that thread has an early PowerBASIC conversion attached. 😀

Okay, so now it has become the second to last post... Anyway just look for the post with *.bas files attached...

See ya.

If anyone knows about dynamic arrays (REDIM PRESERVE) in PowerBASIC:

https://www.vbforums.com/showthread.php?90243 … 396#post5630396

Please see if you can help me out, thank you! 😀

I am closing this topic for the time being. 😀