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The HP64000 assembler for the Nut came about long after the 41 was designed and its ROMs written. There were earlier ROM emulators that were used for debugging.
The SDS was for development of third-party application modules, and did require the HP-85. Originally it did not support the development of microcode, though eventually they added the ability to use some HP-supplied microcode functions.
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Quote:
I also wonder about the box, it looks kind of like a real product, but they must have used less pretty hand built hardware internally?
Not neccessarily, I have worked for big companies where such low volume or even one-off items were mounted in a nice box and had a custom vinyl or anodised aluminium face plate made.
(When I was a student on a 2 month "vacation work" assignment I was tasked to put such an item together).