30219Re: RCA COSMAC Microkit
- Apr 18, 2013Jonathan: That was a very keen observation.
It'll be cool if you are right!
I guess that would mean that data transferring to peripheral
cards for the outside world would have to re-invert before
shipping the data out... or that would be a mess!
--- In email@example.com, Systems Glitch <systems.glitch@...> wrote:
> > Inverted BUS? I have not yet started trying to determine the purpose of the code.
> Some early bus structures were "inverted" in that a logic 0 was represented by what you would normally consider a logic 1 voltage. For TTL, this means that +3 and up is logic 0. The Ohio Scientific uses such a bus for their OSI-48 structure. Tranceivers usually exist with an inverted complement, like the 8T26/8T28.
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