Actually, I think it's a problem on the Raspberry Pi 4. I've heard from a few folks since the RPi4 came out that my how-to about running FreeDOS on the Raspberry Pi (via QEMU) <https://opensource.com/article/18/3/can-you-run-dos-raspberry-pi> results in a very slow FreeDOS. But I've only heard from people about the Raspberry Pi 4. The RPi3 seems to work okay. I have a Raspberry Pi 3, and it works fine. I've run my RPi3 with both Raspbian and Fedora ARM with the same results, so I don't think it's a distro issue, either.
The Raspberry Pi (as lease version 3) is fast enough to emulate a '486 or Pentium CPU well enough to run DOOM and AsEasyAs and other DOS games and applications without lag. On Wed, Mar 18, 2020 at 11:17 AM Ralf Quint <freedos...@gmail.com> wrote: > On 3/18/2020 6:31 AM, Swap Jim via Freedos-user wrote: > > FreeDOS is very, very slow on QEMU running in a Raspberry 4. > > > > It's drawing the screen line by line when I do a DIR on C:\, with only > > 7 directories and files in it. It's worse in full screen. > > > > For those of you that run FreeDOS on a Raspberry, can you offer a tip > > to make it go faster? > > > > Here is some more info. > > > > It's a Raspberry Pi 4 B+ with 4GB of RAM. I'm running the latest > > Raspbian. I couldn't manage to install QEMU from apt, so I've compiled > > version 4.2.0 with these flags: > > > > ./configure --target-list=i386-softmmu --disable-vnc --enable-sdl > > make 'CFLAGS=-Wall -g -O2 -w' > > That is a problem of QEMU, not FreeDOS. > > What some people are forgetting (had the exact kind of discussion in a > vintage computer forum just a few days ago) is that in this case, QEMU > needs to completely emulate an x86 CISC CPU on an ARM RISC CPU, > including converting all data on the fly between little-endian and > big-endian format on the fly, all the time. > > This is a complete different situation for example than emulating a > 16bit x86 PC system on a 64bit x86 host system, like running DOSBox or > VirtualBox. While the later doesn't (in 64bit mode) support 16bit > operation anymore, it is still the same basic underlying CPU > architecture, and the same data "endian-ness". > > Ralf > > > -- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > > > _______________________________________________ > Freedos-user mailing list > Freedos-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freedos-user >
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