| My apple IIe marks a RAM faulty [message #362052] |
Tue, 30 January 2018 08:14  |
Cyril Thibout
Messages: 127
Registered: December 2012
Karma: 0
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Hi
Peforming the self test on my Apple IIe (enhanced) I get a
RAM 0 0 0 0 0 0 0 1 message
and sometimes i get a
RAM 0 0 0 0 0 0 1 1 message
Meaning two am chips are faulty. The trouble is that they are soldered on the main board.
it won't be that difficult but where can I get new chips please ?
thanks
cyril
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| Re: My apple IIe marks a RAM faulty [message #362053 is a reply to message #362052] |
Tue, 30 January 2018 08:45  |
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Originally posted by: cb meeks
On Tuesday, January 30, 2018 at 8:14:31 AM UTC-5, Cyril Thibout wrote:
> Hi
>
> Peforming the self test on my Apple IIe (enhanced) I get a
>
> RAM 0 0 0 0 0 0 0 1 message
> and sometimes i get a
>
> RAM 0 0 0 0 0 0 1 1 message
>
> Meaning two am chips are faulty. The trouble is that they are soldered on the main board.
>
> it won't be that difficult but where can I get new chips please ?
>
> thanks
>
> cyril
My best guess would be eBay. Have you identified the actual chips with equipment like a logic probe or some other device? Do you know how to de-solder it?
If not, there may be people that could help you with this. De-soldering can be tricky sometimes. Much more than just simple soldering. I have a lot of experience with soldering/de-soldering so I might be able to help.
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| Re: My apple IIe marks a RAM faulty [message #362278 is a reply to message #362052] |
Fri, 02 February 2018 05:45 |
Cyril Thibout
Messages: 127
Registered: December 2012
Karma: 0
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Senior Member |
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Hi
No I didn't probe anything. Actually I don't know which 0/1 corresponds to which chip on the board.
Something funnny: I just purchased the FastChip //e (16.16 Mhz!!) and with it the appleIIe works like a charm !
My guess is that 90% of the board is short-circuited by the FastChip card
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| Re: My apple IIe marks a RAM faulty [message #362280 is a reply to message #362278] |
Fri, 02 February 2018 08:38 |
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Originally posted by: frank_o_rama
If you have this display RAM 0 0 0 0 0 0 1 1
It will be these chips (looking at bare board as it sits in the IIe with cover off) X X - - - - - - that are bad. At least that's how it was on mine (which were also not socketed).
I think Jameco still carries compatible RAM.
f
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| Re: My apple IIe marks a RAM faulty [message #363018 is a reply to message #362052] |
Fri, 09 February 2018 14:09 |
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Originally posted by: Henry Pedro
On Tuesday, January 30, 2018 at 9:14:31 AM UTC-4, Cyril Thibout wrote:
> Hi
>
> Peforming the self test on my Apple IIe (enhanced) I get a
>
> RAM 0 0 0 0 0 0 0 1 message
> and sometimes i get a
>
> RAM 0 0 0 0 0 0 1 1 message
>
> Meaning two am chips are faulty. The trouble is that they are soldered on the main board.
>
> it won't be that difficult but where can I get new chips please ?
>
> thanks
>
> cyril
You should be able to buy those old RAMs from aliexpress or (more likely) Jameco Electronics.
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| Re: My apple IIe marks a RAM faulty [message #363027 is a reply to message #363018] |
Fri, 09 February 2018 16:15 |
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Originally posted by: Chris Rupnik
On Friday, February 9, 2018 at 2:09:01 PM UTC-5, Henry Pedro wrote:
> On Tuesday, January 30, 2018 at 9:14:31 AM UTC-4, Cyril Thibout wrote:
>> Hi
>>
>> Peforming the self test on my Apple IIe (enhanced) I get a
>>
>> RAM 0 0 0 0 0 0 0 1 message
>> and sometimes i get a
>>
>> RAM 0 0 0 0 0 0 1 1 message
>>
>> Meaning two am chips are faulty. The trouble is that they are soldered on the main board.
>>
>> it won't be that difficult but where can I get new chips please ?
>>
>> thanks
>>
>> cyril
>
> You should be able to buy those old RAMs from aliexpress or (more likely) Jameco Electronics.
Correct. I just purchased
IC,4164-150,DIP-16, DRAM,64KX1,150NS (MCM6665-15)
chips from jameco last week.
Chris
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