I am currently working on an application that will allow disk access(primarily FDD, HDD, CD-ROM, Ramdisk) in MenuetOS. I found a few problems that need to be worked out.

There will be no problems accessing the ramdisk or HDD since Menuet supports the system calls for these types of disks and even though MeOS doesn't include a syscall for reading from a CD I could probably use syscall 24/ebx=2 (CD audio/get playlist) to read the TOC from it.

However it does not support the reading/writing of a FDD(except when booting/shutting down). I am not sure which software (BIOS routines) and hardware interrupts are reserved or disabled.

Anyone's help would be greatly appreciated. Thanks.

Well, i worked on booting the floppy from within 32bit PM, it works, but only for PC's equiped with a floppy driver that's able to read full tracks. When i find the time, i will work on it.

Once you are 'inside' menuetos, you can't do BIOS call's unless you first write a V86 monitor

There is some info on the web about the FDC (Floppy Drive Controller)
So, some googling will probably get you somewhere.

Is hardware interrupt 6 (for FDC) free within MeOS or is it reserved?

I need a great deal of information on using hardware interrupts.

If anyone can give some tips or web links it would be greatly appreciated.

Thanks.

Hardware interrupt 6 is reserved by kernel at boot-time.
But you can free the interrupt for application use in function "reserve_irqs_ports", kernel.asm.

The interface for the application (I call it DIO - Disk Input Output. The name will be changed soon. ) is complete.

Now all I need to do is work on the disk access routines and help info.

It will allow you to perform 4 basic functions (open, copy, move, and delete).

Here is a listing of hardware interupts by Ralf Brown.
http://www.ctyme.com/rbrown.htm

below is the bios page!
http://www.ctyme.com/intr/cat-003.htm

Can I free IRQ 6 using syscall 45/ebx=1/ecx=6?