Hi, I'm brand new to old Apple computers and I was wondering about an Apple II I have just brought. When I startup without a disk it just says Apple II no cursor or anything according to the original manual. Do I need a DOS 3.3 disk to install or? Also I've got a text card in the AUX slot but when I launch specific programs it says it requires 128KB ram but also according to the manual I've apparently got 128KB does this mean that the ram chips have failed? Thanks!