There was a Reddit post about an issue in the DOS game Prince of Persia 2, hence I decided to compile a fresh version of the DOSBox Pure core. Here are the results:

1.  Prince Of Persia 2 is working

2. Performance is better

For the performance comparison, I used a couple of apps from DOS Benchmark Pack - PC Player Benchmark (P) and Landmark System Speed Test (L):

 - Old core: P - 14.6 score, L - 95MHz CPU / 455MHz FPU

 - New core: P - 21.7 score, L - 99MHz CPU / 472MHz FPU

Here are my settings for the benchmarks: overclock++, Threaded Video is ON, Image Interpolation = Bilinear, Power Management profile = Maximum Performance (locks CPU at 1.5GHz for benchmarking, only for tests, leave it at Balanced for games)

1. fixed *.img loading and on-screen keyboard crash in some games

1. Added "Hold Start + Restart" combo (check readme.txt)

2. Added keyboard support

1. Fixed crashing upon opening the on-screen keyboard in the Daggerfall

Known issues of Dual System firmware:

Games that have spaces in their name, cannot be opened.

Here are a couple of solutions (choose one):

- Open /CFW/config/coremapping.json on 1st sdcard in any text editor and replace /mnt/mmc/Roms/APPS/Mod/Emu/dos/launch.sh with dosbox_pure_libretro.so

- Open /Roms/APPS/Mod/Emu/dos/launch.sh on 1st sdcard in any text editor and wrap $1 with double quotes, "$1"

- Rename the roms and replace spaces with underscores (e.g. "Battle Chess.zip" => "Battle_Chess.zip")