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Mac Portable SiClone RAM board

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I have in my hands a SiClone "RAM-to-Go" card for the Mac Portable.


When put in the machine, the machine chimes, and the screen starts (light herringbone) pattern, but I never get the cursor, nor the Happy Mac. I've let it sit for about 10 minutes, in case it's taking a _really_ long time to do the RAM check, but nothing ever happens.


I have a Kingston 1 MB card, and that works fine in the same slot - chime, slight screen pattern, then cursor, then Happy Mac, etc.


On the other side of the card from the picture, there is an EPROM that doesn't have a sticker over the window. I suppose it's possible that it's been erased, or I suppose the card might be bad in some other way.


It's a 4MB card, so would be a nice add to the machine. I've not been able to find any doc on this guy, only an archived InfoWorld article that talks about the card being released - at $2499.00 for the 4MB version!


https://books.google.com/books?id=pjAEAAAAMBAJ&pg=PT31&lpg=PT31&dq=siClone+mac+portable&source=bl&ots=eeXxpaJ_jq&sig=ACfU3U07hBRdEvaBBp2rlaXyF5sPj9IkLg&hl=en&sa=X&ved=2ahUKEwjblPugr8ThAhWNm-AKHWlsCwwQ6AEwAnoECAgQAQ#v=onepage&q=siClone mac portable&f=false


Any info or hints on how to diagnose this guy appreciated!


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