The original MacOS is screen size independant, it's just a variable set at startup time. Memory can be as low as 512k but 1-4 megs is better. The whole interface can be run with a mouse. It can boot a complete GUI from 800k images and have space for games etc. I trimmed a useable(?), bootable system folder down to 180k once. I have almost every developer CD since 1991, what would you like to know? I have used several Mac Emulators they all work well, it's just them © ROMs that are a hassel. But I have a load or the hardware ones.
What about an Apple ][ emulator?