Emulators seem to replace one another.
Versatile Commodore Emulator
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Trying to install a second emulator in addition to the first installed, replaces the first installed.
For example if you install x64 and then try to install x128 in addition, it just replaces x64. You can't have them all together and someone needs to keep the apk in the device to switch whenever needed!
please try the libretro based port