Re: 82s100

From: Raymond C. Bryan (
Date: 2002-06-22 18:58:44

>Professor Dredd wrote:
>>When I saw the guy say he could make a replacement for 82s100 I thought
>>it sounded like a good idea. Not knowing how to make such an IC, I
>>wonder what would be required to configure the (hypothetical) new
>>device for use on C-64 and other CBMs.
>One could build a small adapter board that holds a modern surface 
>mounted programmable logic chip (and its boot EEPROM if the chip 
>needs one).  Any chip that features at least 16 inputs and 8 outputs 
>(or e.g. 24 programmable I/O pins) will do the job.  But I think 
>that the cost will be higher than that of a C64 PLA (or a broken C64 
>that has a working PLA).  The replacement does make sense for rarer 
>machines, such as the PET product line or the 264 series.

My experience as a prepair shop for Commodores is that the PLA is the 
most likely IC to be damaged.  At some point a source will need to be 
found for keeping the remaining c64's alive.

|Raymond C. Bryan  651-642-9890 vox      | The battle is sometimes |
|Raymond Computer  651-642-9891 fax      | to the small for 
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|St Paul MN  55114          | the harder they fall.   |
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