What a nicely stacked setup!
via Aaron Poffenberger
I didn’t find it easy to see what the difference was with the Plus, compared to the original II. This helped:
(There’s a story within about how the original source to the new monitor was lost, and how it was recreated.)
So, we get Applesoft Basic in ROM, a smarter monitor ROM with better screen editing and which supports autoboot and warm boot, and RF shielding. But
Missing from the Apple II Plus ROMs were Integer BASIC, the miniassembler, and Woz’s SWEET 16 interpreter, that entire space now being used by Applesoft. Missing from the Monitor were the assembly language STEP and TRACE features, and a set of sixteen-bit multiply and divide routines