Apple II EuroPlus boot issue

5 replies [Last post]
Offline
Joined: Dec 15 2011
Posts: 3

Hi,

I am wondering if anyone is able to help me at all?

I recently acquired an old Apple II EuroPlus system, has the disc controller card and 2 disc drives, no other expansion card of any type fitted.

When I turn it on, there is no beep and the screen displays a random load of characters and that's it, no further.

Any ideas as to what the problem may be?

I took a photo of the screen so you could see:


I read somewhere but I can't seem to find where I read it now, that it could be something to do with the RAM chips, most of the ram chips inside are D416C-2 or ones which say 4116 on them which I can't find any info on.

Maybe it is the ram or maybe it is something else.
I am hoping someone here has seen this before and has the solution, I am so eager to get it up and running and have a play. It is my first vintage Mac to my collection and would really like to see it working before I give up collecting vintage Macs before I have even started.

Many thanks for any help in advance.

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.
Offline
Joined: Oct 9 2011
Posts: 1063
Re: Apple II EuroPlus boot issue

4116 are 16k ram chips the 3 voltage type. If you want to google mk4116, you should be able to find a data sheet on them.

Offline
Joined: Jun 5 2008
Posts: 382
Re: Apple II EuroPlus boot issue

If they display is not changing, then DRAM (at least the part used for video display) is good and your problem is going to be either the Processor itself or interface between the processor and PROM or DRAM

Offline
Joined: Dec 15 2011
Posts: 3
Re: Apple II EuroPlus boot issue

I have kind of sorted it, I swapped over row C with Row E of the ram chips and the system now boots.
I can now load my AppleDos disk and use the computer.
Cant load some of the stuff from the disc though as some stuff on there required the language card but I am fine with that right now, just happy I got it working.
Just gotta swap the ram chips back 1 by 1 to figure out which one or two is faulty then I can replace.

Looks like the problem seemed to just be the ram, hopefully that is the only problem as the ram chips are pretty easy to find now I understand what chips they are.

Offline
Joined: Dec 15 2011
Posts: 3
Re: Apple II EuroPlus boot issue

*EDIT* whoops, for some reason my post duplicated itself.

speedyG's picture
Offline
Joined: Nov 16 2011
Posts: 2413
Re: Apple II EuroPlus boot issue

just sent pm.
good idea to download the "apple II circuit description" as .pdf-file from apple documentation website within the so called "apple web ring".... probably asimoiv website.... it´s the "bible on troubleshooting the apple II" and contains detailed description of the apple II circuitary and a good troubleshoot list on commen errors and hardwarefaults of the spple II.

__________________

In early days I had a lot of money but no time - now I have no money but a lot of time....
the second part includes less friends but a lot more joy on life....