Hi there, the screen show Basic 10.0 v0.9B.911001. It also has a yellow border. Just starting with Mega65 on Zemu. Just ordered the Mega65 last week.
The problem that you're using original C65 ROM. It does not know the hex number feature $1600 in line 250 (among many-many other things). This syntax is a MEGA65 BASIC (BASIC65) extension so you need that ROM to work.