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An Apple II Plus that I am looking at seems to not be booting properly. When booted up without software it does not produce the typical 'Apple ][' but a mass of question marks (?) with a few blinking j's, u's, and 5's.
He said that it could be that he needs to reset the ROM.
Inside there is a GraphiCard printer card, a SuperSerial card, an Apple Disk control card, and an Applied Engineering Viewmaster-80.
Is it possible that they wired the monitor and 80-column card wrong?
Hi, take a look here or here ... hope that helps ... at my II+ I had a similar problem ... at the end it was a bad RAM ...
The easiest method of troubleshooting would be to bypass (remove) the the 80-column card (if possible, hooking the monitor directly to the II Plus) and remove all the other cards also.
Who is "he" ?
If you get the "Apple ][" - great. Simply re-add the cards until the problem resurfaces.
Thank you for your replies, I will see what can be done.
'He' is an eBay seller.
Edit: Removing all the cards did not solve the issue.
Do you get a beep at power on? If not, then IF there is a bad ram chip, one way to isolate is to reduce the memory to 16K. The memory is 3 rows of 8 chips in the white outlined region of the
motherboard. The first row closest to the keyboard is the lowest 16K address space. Remove the two rows of 8 chips further back and organize them to the side in a layout as they came out. Power on with only the front row filled and see if you get a beep and possibly the Apple II logo on screen.
Hello VanguardFed,
sorry for the delay of this response - i was tied up in last days to a
application to our constitutional court with a fixed deadline.
There for i didn´t have time for a reply.
Now after that bunch of work is off the table I´m preparing a page with instructions
related to exactly the problem you are facing. That page should be finished within
this weekend and i´ll upload then immediatly the page to my site and publish here the link to it.
I guess then you will be able to carry out that task of debugging.
sincerely speedyG
Update: the page is availiable at this adress:
http://www.appleii-box.de/D04_resurection.htm
it´s not finished at the moment but it´s at least rather complete with your problem.
it will be extended in the next week with additional text related to the topic.
Thank you very much for that guide, hopefully it will solve the problem.
Thanks a lot for that! Great!
I´ve updated the page:
http://www.appleii-box.de/D04_resurection.htm
with additional new information.
sincerely speedyG
It´s still not complete and further info´s will be added within next days.