Then it will automatically move on to a speaker icon, where the speak keeps outputting 6 tones from low to high over and over until you hit the space bar. If you have the cable, then it will slowly make clicking sounds in the speaker that pick up the pace until they are vary rapid. I'm assuming that is an error code of some kind that you could reference in the manual. Pressing space here goes back to the logic circuit symbol, and it puts an X through it and shows number 570. If you continue, then it shows an icon of what looks like a simple logic circuit, and then if the loopback is not plugged in, shows an icon of the //c with what appears to be the loop back connected in the back with a flashing question mark. After that, it gives you basic instructions about how this is meant to be used with a technical manual, and if the results match the manual, press the space bar. Then you come to a menu to select your language. I assume at this point it's running a RAM test. When you boot it, it goes through several different screens of patterns.
If it is documented somewhere and I just couldn't find it, my apologies for duplicating it. As I can't find any documentation on this, i figure i would document it here if anyone is interested. Now I can actually go through the diagnostic disk successfully. But I did manage to acquire an offical Apple loopback cable for the //c, part number 077-8148. If anyone knows for which manual and where to find a copy, I'd be interested. But I've never identified which manual it is. Apparently it is meant to be used in conjunction with some service manual and a loopback cable. I tried running it on my //c, but never got much out of it. I found the Apple //c diagnostic disk image a while back.
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