FCOMIP just saves you the work of manipulating EFLAGS, so you could use FCOMP and merge the condition flags the hard way, for example: fcomp push ax fstsw ax mov al,ah lahf and ax,0ba45h or ah,al sahf pop ax Maybe make it a subroutine if used a lot. Thank you, I've tried it and now the Analog Clock …

Do you perhaps happen to know, what would be the easiest way to modify my AEC-to-x86 compiler (you can run the core of it in browser: https://flatassembler.github.io/compiler ) to be able to target i486? Right now, I think it targets i486, except relying on the `fcomip` instruction which exists only …

I have built DosBox from source on Solaris 11. What I've tried thus far (not very much) works fine, but one quirky problem I've noticed is that, when you type "EXIT" in the prompt and press "enter", DosBox hangs rather than exits, and it needs to be killed forcefully. Why is that?

@FlatAssembler you may want to try with dosbox-x, it has a cputype=ppro_slow I mean, I can run my program in QEMU and VirtualBox. It's just that I hoped DosBox was an easy way for my future employers who will review my code to run it. Now they will most likely say they don't know if it works. Well, …

Ah, well, if running in DOSBox is important to you then perhaps recoding for FCOMP is a possibility, although you may find working with the FPU flags more cumbersome than with EFLAGS. Well, it's not that important to me. I assumed it had something to do with the inline assembly I put in my program, …

If you run your program in a debug build of DOSBox, the log messages it produces give you an excellent clue about one problem. The compiled program is using FPU opcodes that DOSBox does not emulate, e.g. FCOMIP that is only found on Pentium Pro and later. I think you may need to set the target CPU …

Why does it output different from FreeDOS running under QEMU?

Here is what it outputs under DosBox:

Hey, guys! I've made a program in my own programming language targeting DOS. It's available in this ZIP-archive , the executable is "analogClockForDOS.exe", and the source code is "analogClockForDOS.aec". It's important for me that this program works in DosBox so that people can test it. While it …

Anyway, I've improved my compiler using the Duktape framework to be able not only to translate single directives from my own programming language into Assembly, but to also be able to translate entire simple programs stored in files. Here is one of the first programs I've written in the first …

OK, I get it. This isn't a good forum for such questions.

So, do you think I am good at programming? Is it worth continuing? If so, what would you recommend me to learn next? I've made that in JavaScript, and that's the only programming language I know well enough to be able to do that in it.

Hey, guys! New here. I've just made a simple web-app that attempts to convert arithmetic expressions to i486-compatible assembly: Arithmetic expression to assembly converter (My website sleeps from 22h to 23h GTM+1.) I've tried to test it (using Flat Assembler), and to me it seems like it produces …