Apple III screen output issue.
I'm new to this site and relatively mew to vintage Apple computers in general. My family was a Commodore household growing up, mainly because of price. Like many other 80's households, we progressed from an "affordable" Vic-20 to a Commodore 64 to an Amiga 500, until conforming to a dreaded 286 MS-Dos-based computer in college. But I always envied a high school buddy of mine who had an Apple IIe, color monitor and two disk drives. (I can still picture him playing Ultima IV and Bard's Tale on it.) I liked my Commodore 64, but I really wanted that Apple.
These days I enjoy collecting vintage computers as a hobby. Like other enthusiasts, I do garage sales, check craigslist, etc. Anyway, a few months ago I was driving after dropping my kid off at soccer practice and I see an old computer sitting by the road next to a trash can. Score! It turns out to be an Apple /// computer, monitor, second drive and printer.
After cleaning it up and plugging everything in (while shrugging off the crazy looks my wife is giving me), the darn thing works. I get an arrow prompt.
Excited, I get a serial cable, order some DS/DD diskettes and download ADTPro, ready to start my first bootstrapping process from "bare metal."
When the diskettes finally come in, bad news. I turn everything on and get scrambled characters on the screen. The computer seems to be booting up fine. Drive still grinds. I still get the beep from the key sequence. I can even sort of see the blinking cursor, but I am getting a bunch of random characters on the screen.
At first I think it's an issue the monitor, so I plug the computer into a Commodore 1702. Same thing. It doesn't seem to be the monitor.
Anyway, still hoping for my first working Apple computer. I admittedly have very limited technical knowledge and ability but would love to try to get the thing up and running again. Any advice?
Thanks in advance!