Hi Paul, > That's because on a AHCI only computer (without PATA or SATA IDE), > you cannot access the sectors with INT 13h.
Yes you can. For harddisk/SSD. Unless you configure the computer to disable BIOS completely and boot only UEFI operating systems. But in that case, you get plenty of other problems and should really load a CSM to get BIOS services for DOS. If switching the simulated controller to AHCI breaks BIOS services in QEMU, that simply is a bug in QEMU. For the hypothetical situation that you want to boot from a drive without BIOS support, you can do as EZ DRIVE and similar drivers did in the 1990s: Load your driver BEFORE DOS and let it provide the BIOS int 13 services. Your driver will probably have to be some form of UEFI boot loader in that case, which means it would be better to load a CSM in the first place. However, if you boot from CD / DVD, you actually get the opposite effect: El Torito support is activated and makes it easy to have BIOS style CD / DVD access. Also, you can use MEMDISK to init bootable ramdisk contents from any type of drive which is supported by GRUB, ISOLINUX and other Linux boot tools :-) Regards, Eric _______________________________________________ Freedos-devel mailing list Freedos-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-devel
