Hi Francisco, > When I attempt to start the FreeDOS using VirtualBox, I get the following DOS > screen: > It says:
> JemmEx v5.75 [05/21/11] > System memory found at c900-dfff, region might be in use This may mean that JEMMEX has doubts about whether that area is suitable for use as UMB area. You could exclude the area, to be on the safe side. Or even skip loading JEMMEX completely and load only some XMS and HMA driver instead, such as HIMEM. You can also load neither HIMEM nor JEMMEX, but then you will not be able to use XMS or HMA. Less DOS memory will be free. If you only skip JEMMEX but load HIMEM, you will not have EMS or UMB memory. Most software for DOS is happy with XMS, so it does not need EMS, but without UMB, you can not load drivers and other resident software outside the first 640 kB of memory so you will have a bit less DOS memory free. > JemmEx loaded > Kernel: allocated 46 Diskbuffers = 24472 Bytes in HMA At this moment, HMA becomes available and the FreeDOS kernel starts to use it. You probably mention the message because that is exactly the moment when DOS hangs in your VirtualBox? It is possible that trying to use HMA, XMS or UMB, some driver or the kernel accidentally got in conflict with memory used by your VirtualBox BIOS or virtual hardware for something else, causing a crash. Your JemmEx message warns about such a risk. It also is possible that "A20 switching" of your JEMMEX caused problems by either crashing or having no effect, but as it has various A20 styles available, you could try non-default styles. Please read the documentation of JEMMEX and edit your config sys (or fdconfig sys) file to use more "cautious" options for JEMMEX. Alternatively, simply skip loading JEMMEX completely, for example using the usual F5 or F8 hotkeys or, if you have a menu defined in your (fd)config sys file, by selecting one of the boot configs which use other drivers than JEMMEX :-) > Any help would be appreciated.Thanks It is possible that changing the type of virtual harddisk, USB or network controller or virtual A20 hardware can help, too! :-) Regards, Eric PS: You have not specified where the "FreeDOS 1.1 VDI" VM image came from and which versions of what and which configs it uses. ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
