Simple answer: yes and no. No, don't use the other sockets. Yes you can add and boot from different ROMs by piggy-backing them on top of each other, using a switch, a 22k ohm resister for each ROM to "pull low" the selected ROM, and a full pin schematic of the ROM. I can't tell you which pins for Amiga ROMs while typing in bed on my iPhone at 4:57 am on a Sunday morning, but I've done it on my two C128D's and an Osbourne CP/M computer. Just Google "piggy-Back ROMs" to find out the why and how and compare the Vcc pin & Ground pin on the Amiga's ROM
