Re: Software for MS-DOS 1.25

Hello!

smf wrote:

> It's not emiting code that is not compatible, it's linking libraries
> that aren't compatible. You don't need to link against those libraries,
> you can write your own.

You're right. It was a kind of thinking shortcut I made.

I have never created C libraries before, so... there always must be a
first time ;-)

Another alternative would be to write a MS-DOS 2.x function wrapper for
MS-DOS 1.25. Basically it would have to translate filehandle API to the
FCB API, and possibly some other stuff as well. I have no idea how
feasible it would be.

> I doubt there is a C compiler that targets DOS 1.25 out of the box. 

I haven't found anything like that either. So far I made Microsoft BASIC
compiler 1.0 to work on the machine, by hacking a crude INT 10h and INT
16h implementation :-)

> But
> I also doubt it would be that hard to hack together a runtime library
> that would allow you to run cbmbasic at least in interactive mode
> (without access to files). Which will at least give you an idea whether
> it's worth finishing.

But then, how about using something like Turbo C? If the I/O library is
using only INT 21h to handle console input/output, then it could be
possible to make it work. Accessing files would of course not be possible.

> If you can get an emulator for it then I'd be happy to help out.

I suppose we could run it in a DOSBox with a kind of interrupt overlay
which would catch all interrupt calls that are not present in the
Commodore MS-DOS?

Regards,
Michau.

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