Posted By
TLC
on 2009-06-19
12:09:56
|  Re: faulty plus4
Another (last) idea: let's suppose that the unit could boot up, we just couldn't see the screen (due to a possible fault in the TED, which prevents it to fetch screen data from $0800 which is it is specified by the Kernal).
For that's to (dis)prove I'd try moving the cursor first by using the cursor keys. ...The cursor is shown wherever it is positioned on the screen, regardless to the current screen memory bank setting. If I still couldn't judge I'd connect a floppy drive and press F3 (which is a directory command + enter)... if the floppy starts rotating that shows that the computer is still sort of alive.
...I'd suggest blindly entering commands from the keyboard to see if there's any effect, I'm just not sure if that can be done safely (ie. the keyboard is in a perfect order so we don't just get some syntax errors as the only result (that we couldn't see anyway)).
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