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From: Clocky on 2 Mar 2010 18:59

"Sam" <siemappelman(a)quicknet.nl> wrote in message
news:7f0cabbe-d77a-4a2d-aa41-73f8e0a7e034(a)q15g2000yqj.googlegroups.com...

>
> Here you can find the different C64 motherboards:
> http://www.cbmhardware.de/c64/c64board.php?Lang=E
>
> SAM
>


Good link Sam, thanks for posting!


From: Jack Tseng on 3 Mar 2010 17:41

"Clocky" <notgonn(a)happen.com> wrote in message
news:4b8c73bd$0$8841$c3e8da3(a)news.astraweb.com...
>
> "Jack Tseng" <tseng4(a)hotmail.com> wrote in message
> news:Uj_in.215862$OX4.209979(a)newsfe25.iad...
>>
>> "Clocky" <notgonn(a)happen.com> wrote in message
>> news:4b8b4dbb$0$8789$c3e8da3(a)news.astraweb.com...
>>>
>>> "Jack Tseng" <tseng4(a)hotmail.com> wrote in message
>>> news:s7Gin.9733$mn6.7678(a)newsfe07.iad...
>>>> C-64 diagnostic checks the zeropage, stackpage, colour ram, etc... It
>>>> found the bad memory U21 on 64K ram. I was checking the mainboard,
>>>> there is no U21 printed on the board. I dont know if the board is
>>>> different. The board was made in 1986 and Hong Kong. Other printed is
>>>> W-18 94HB. Anyone help me where I find the memory chip?
>>>>
>>>
>>>
>>> http://www.c64-wiki.com/index.php/Image:C64Cmotherboard.jpg
>>>
>>> If that looks like your board, there are two DRAMs directly above where
>>> it says PCB ASSY on the mainboard.
>>>
>>> DRAM failure is common for that board, especially if the power supply
>>> has ripple so you best check that too.
>>>
>>
>> I think I found C64 PSB ASSY #250466, it looks exactly one as mine.
>>
>> http://www.auctiva.com/hostedimages/showimage.aspx?gid=45129&ppid=1122&image=300723127&images=300723127&formats=0&format=0
>>
>>
>
> What are the numbers on the two chips in the left corner of the board
> above the bare section to the left of the empty solderpads? Those two 18
> pin chips look like the DRAM's.
>

it is MN41464-15 Japan 64432 on the U9 and U10 sockets.


From: Clocky on 3 Mar 2010 17:54
Jack Tseng wrote:
> "Clocky" <notgonn(a)happen.com> wrote in message
> news:4b8c73bd$0$8841$c3e8da3(a)news.astraweb.com...
>>
>> "Jack Tseng" <tseng4(a)hotmail.com> wrote in message
>> news:Uj_in.215862$OX4.209979(a)newsfe25.iad...
>>>
>>> "Clocky" <notgonn(a)happen.com> wrote in message
>>> news:4b8b4dbb$0$8789$c3e8da3(a)news.astraweb.com...
>>>>
>>>> "Jack Tseng" <tseng4(a)hotmail.com> wrote in message
>>>> news:s7Gin.9733$mn6.7678(a)newsfe07.iad...
>>>>> C-64 diagnostic checks the zeropage, stackpage, colour ram,
>>>>> etc... It found the bad memory U21 on 64K ram. I was checking the
>>>>> mainboard, there is no U21 printed on the board. I dont know if
>>>>> the board is different. The board was made in 1986 and Hong Kong.
>>>>> Other printed is W-18 94HB. Anyone help me where I find the
>>>>> memory chip?
>>>>
>>>>
>>>> http://www.c64-wiki.com/index.php/Image:C64Cmotherboard.jpg
>>>>
>>>> If that looks like your board, there are two DRAMs directly above
>>>> where it says PCB ASSY on the mainboard.
>>>>
>>>> DRAM failure is common for that board, especially if the power
>>>> supply has ripple so you best check that too.
>>>>
>>>
>>> I think I found C64 PSB ASSY #250466, it looks exactly one as mine.
>>>
>>> http://www.auctiva.com/hostedimages/showimage.aspx?gid=45129&ppid=1122&image=300723127&images=300723127&formats=0&format=0
>>>
>>>
>>
>> What are the numbers on the two chips in the left corner of the board
>> above the bare section to the left of the empty solderpads? Those
>> two 18 pin chips look like the DRAM's.
>>
>
> it is MN41464-15 Japan 64432 on the U9 and U10 sockets.

That's them. You can replace them with virtually any xx464 memory chip, I
would recommend removing both DRAMs and replacing them with sockets.


From: Jack Tseng on 3 Mar 2010 19:47

"Clocky" <notgonn(a)happen.com> wrote in message
news:4b8ee8bc$0$8757$c3e8da3(a)news.astraweb.com...
> Jack Tseng wrote:
>> "Clocky" <notgonn(a)happen.com> wrote in message
>> news:4b8c73bd$0$8841$c3e8da3(a)news.astraweb.com...
>>>
>>> "Jack Tseng" <tseng4(a)hotmail.com> wrote in message
>>> news:Uj_in.215862$OX4.209979(a)newsfe25.iad...
>>>>
>>>> "Clocky" <notgonn(a)happen.com> wrote in message
>>>> news:4b8b4dbb$0$8789$c3e8da3(a)news.astraweb.com...
>>>>>
>>>>> "Jack Tseng" <tseng4(a)hotmail.com> wrote in message
>>>>> news:s7Gin.9733$mn6.7678(a)newsfe07.iad...
>>>>>> C-64 diagnostic checks the zeropage, stackpage, colour ram,
>>>>>> etc... It found the bad memory U21 on 64K ram. I was checking the
>>>>>> mainboard, there is no U21 printed on the board. I dont know if
>>>>>> the board is different. The board was made in 1986 and Hong Kong.
>>>>>> Other printed is W-18 94HB. Anyone help me where I find the
>>>>>> memory chip?
>>>>>
>>>>>
>>>>> http://www.c64-wiki.com/index.php/Image:C64Cmotherboard.jpg
>>>>>
>>>>> If that looks like your board, there are two DRAMs directly above
>>>>> where it says PCB ASSY on the mainboard.
>>>>>
>>>>> DRAM failure is common for that board, especially if the power
>>>>> supply has ripple so you best check that too.
>>>>>
>>>>
>>>> I think I found C64 PSB ASSY #250466, it looks exactly one as mine.
>>>>
>>>> http://www.auctiva.com/hostedimages/showimage.aspx?gid=45129&ppid=1122&image=300723127&images=300723127&formats=0&format=0
>>>>
>>>>
>>>
>>> What are the numbers on the two chips in the left corner of the board
>>> above the bare section to the left of the empty solderpads? Those
>>> two 18 pin chips look like the DRAM's.
>>>
>>
>> it is MN41464-15 Japan 64432 on the U9 and U10 sockets.
>
> That's them. You can replace them with virtually any xx464 memory chip, I
> would recommend removing both DRAMs and replacing them with sockets.
>
>

http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&pa=41574&productId=41574&cid=findchips

how s about it?


From: Clocky on 4 Mar 2010 00:23
Jack Tseng wrote:
> "Clocky" <notgonn(a)happen.com> wrote in message
> news:4b8ee8bc$0$8757$c3e8da3(a)news.astraweb.com...
>> Jack Tseng wrote:
>>> "Clocky" <notgonn(a)happen.com> wrote in message
>>> news:4b8c73bd$0$8841$c3e8da3(a)news.astraweb.com...
>>>>
>>>> "Jack Tseng" <tseng4(a)hotmail.com> wrote in message
>>>> news:Uj_in.215862$OX4.209979(a)newsfe25.iad...
>>>>>
>>>>> "Clocky" <notgonn(a)happen.com> wrote in message
>>>>> news:4b8b4dbb$0$8789$c3e8da3(a)news.astraweb.com...
>>>>>>
>>>>>> "Jack Tseng" <tseng4(a)hotmail.com> wrote in message
>>>>>> news:s7Gin.9733$mn6.7678(a)newsfe07.iad...
>>>>>>> C-64 diagnostic checks the zeropage, stackpage, colour ram,
>>>>>>> etc... It found the bad memory U21 on 64K ram. I was checking
>>>>>>> the mainboard, there is no U21 printed on the board. I dont
>>>>>>> know if the board is different. The board was made in 1986 and
>>>>>>> Hong Kong. Other printed is W-18 94HB. Anyone help me where I
>>>>>>> find the memory chip?
>>>>>>
>>>>>>
>>>>>> http://www.c64-wiki.com/index.php/Image:C64Cmotherboard.jpg
>>>>>>
>>>>>> If that looks like your board, there are two DRAMs directly above
>>>>>> where it says PCB ASSY on the mainboard.
>>>>>>
>>>>>> DRAM failure is common for that board, especially if the power
>>>>>> supply has ripple so you best check that too.
>>>>>>
>>>>>
>>>>> I think I found C64 PSB ASSY #250466, it looks exactly one as
>>>>> mine.
>>>>> http://www.auctiva.com/hostedimages/showimage.aspx?gid=45129&ppid=1122&image=300723127&images=300723127&formats=0&format=0
>>>>>
>>>>>
>>>>
>>>> What are the numbers on the two chips in the left corner of the
>>>> board above the bare section to the left of the empty solderpads?
>>>> Those two 18 pin chips look like the DRAM's.
>>>>
>>>
>>> it is MN41464-15 Japan 64432 on the U9 and U10 sockets.
>>
>> That's them. You can replace them with virtually any xx464 memory
>> chip, I would recommend removing both DRAMs and replacing them with
>> sockets.
>
> http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&pa=41574&productId=41574&cid=findchips
>
> how s about it?

Perfect!


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