I'm trying to play two Amstrad CPC text adventures -- "Island" and "The Base" by Ken Bond. But the display is very hard to read and had a cyan tinge (on a real CPC it would be white text on a dark blue background). It's as if the font has been slightly garbled. This happens with several recent releases of Batocera, and on various different PCs, so I guess it's either a problem with the ROMs or the emulator.
Other CPC ROMs work fine, but these two are different, possibly because they use the CPM operating system. (You start the games by typing |CPM at the prompt.)
Is there anything I can try to play these games again?