Unfortunately your 'simpler implementation' for the im05 doesn't work in MAME 0.220 - the functions m_display->write_mx/my in pwm.h are not compatible with the old pwm version.

Also just adding these declarations to pwm.h didn't work, it would also require some other changes, but that's no option for me, because then almost all other drivers (which require pwm) won't work anymore.

Is there any simple replacement for these 2 functions m_display->write_mx/m in your updated im01 driver, that would also work with the old pwm version?
If not, then I'll stuck with your previous im01 driver and layout ...