Hugo Holden
Veteran Member
I have been repairing 16KRA memory boards for my SOL-20. In one case the digital delay line had failed. I have written an article about this and my attempts to deal with it:
http://worldphaco.com/uploads/PROCESSOR_TECHNOLOGY_16kRA_RAM_CARD.pdf
This should be of interest to those with this memory card.
Along the way an astonishing thing happened:
In 1977 or thereabouts Processor Technology placed an order with Data Delay Devices of Clifton NJ, for a custom delay line for the 16KRA card of 100 nS, 150nS, 250nS and 350nS. These delays are not standard. This was required to coordinate the machine cycle of the 16KRA card.
41 years later Data Delay Devices can still build this module. It is the best example of long term product support for a custom component that I have ever encountered. The story is in section 5 of the article.
http://worldphaco.com/uploads/PROCESSOR_TECHNOLOGY_16kRA_RAM_CARD.pdf
This should be of interest to those with this memory card.
Along the way an astonishing thing happened:
In 1977 or thereabouts Processor Technology placed an order with Data Delay Devices of Clifton NJ, for a custom delay line for the 16KRA card of 100 nS, 150nS, 250nS and 350nS. These delays are not standard. This was required to coordinate the machine cycle of the 16KRA card.
41 years later Data Delay Devices can still build this module. It is the best example of long term product support for a custom component that I have ever encountered. The story is in section 5 of the article.