Quote:
Originally Posted by georgedb
That is an interesting remark, about all connections defaulting to 0 rather than 1... That would suggest a completely different setup/technology was used.
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That's actually completely normal for Bipolar PROMs, in which the programmable element is literally a fine fuse which has to be blown open circuit to represent one state, or left intact to represent the other.
In EPROMs an electrical charge is pushed onto the gate of a FET where it will stay for several decades before finally fading away. Despite this, EPROM programmers are often still referred to as 'Blowers' even though they don't really blow anything.
I mentioned the default logic state in the Tesla devices only because the German data sheet (discussed earlier) appeared to be describing a device in which the default state of all the bits was 'H', or 1. That makes it unlikely that the data sheet describes the Tesla device.