Re: Random Characters

I just re-read your email. Did you mean you had a 906114-02 originally 
in your C64, and it worked ???

On 29/01/2012 18:56, Rob Clarke wrote:
> Hi Ed - Yes, they are all interchangeable with the exception of th 
> later cost reduced boards which don't have a stand alone PLA - the 
> majority of the logic functions are integrated into a single large 
> MMU. I think the 906114-02 (as well as -03,-04 & -05) was from one of 
> the P or B series machines, so no, it will not be compatible.
>
> Rob
>
> On 29/01/2012 17:48, Ed Johnson wrote:
>> It's a  906114-02 is that interchangeable with a 906114-01?
>>
>>
>> Best regards,
>> Ed Johnson
>> (904) 584-4362 VoIP
>> (904) 444-5402 Cell
>>
>> -----Original Message-----
>> From: Rob Clarke [mailto:crock@clarke-family.org.uk]
>> Sent: Sunday, January 29, 2012 10:10 AM
>> To: cbm-hackers@musoftware.de
>> Cc: Ed Johnson
>> Subject: Re: Random Characters
>>
>> Some early boards do not have the commodore part number on the PLA. 
>> In this
>> particular photo it's below the 6510 (cpu) and to the left of the
>> 6581 (SID).
>>
>> If it is the PLA at fault, you can buy a new one here:
>> http://www.arcadecomponents.com/catalog/item/3054735/8335676.htm or 
>> buy a
>> modern replacement here :
>> http://retro-donald.de/sinchai-shop/index.php?main_page=product_info&cPath=3 
>>
>> &products_id=16
>> <http://retro-donald.de/sinchai-shop/index.php?main_page=product_info&cPath= 
>>
>> 3&products_id=16>
>>
>> rob
>>
>> On 29/01/2012 16:01, Ed Johnson wrote:
>>> I don't see that chip. Can you identify it in this photo?
>>>
>>> http://upload.wikimedia.org/wikipedia/commons/8/86/C64motherboard.jpg
>>>
>>>
>>> -----Original Message-----
>>> From: owner-cbm-hackers@musoftware.de
>>> [mailto:owner-cbm-hackers@musoftware.de] On Behalf Of Gerrit Heitsch
>>> Sent: Sunday, January 29, 2012 8:56 AM
>>> To: cbm-hackers@musoftware.de
>>> Subject: Re: Random Characters
>>>
>>> On 01/29/2012 02:29 PM, Ed Johnson wrote:
>>>> I have a C64 that displays random characters on the screen and locks
>>>> up when powered on. Sometimes it powers on correctly but within
>>>> seconds displays random characters and locks up. I bought it off eBay
>>>> and it worked fine for about a week of heavy use but then this
>>>> problem
>>> started.
>>>
>>> The usual suspects in this case are the PLA (906114-01), the 74LS258,
>>> the CIA that supplies the 2 extra address bits for the VIC and maybe 
>>> the
>> RAM.
>>> Also, if any of the chips I mentioned are in sockets, see if removing
>>> them and putting them back in helps.
>>>
>>>     Gerrit
>>>
>>>
>>>
>>>
>>>          Message was sent through the cbm-hackers mailing list
>>>
>>>
>>>          Message was sent through the cbm-hackers mailing list
>>
>


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