> 6850 was the UART, 6823 was the PIA (MC146823 to be exact). I don't think
> anyone still makes it.


MC6821 = pia afair

gOOGLES ....................

www.cs.net/lucid/6821_data.pdf

pICTURES EVEN ..................  :-)

        http://www.itofamily.com/ito/collections/peripherals/6820-21/


Hmmm
Memory stirs
6820 / 6821 ... can't remember the difference
Maybe just faster and better spec ... ?

6847 DMA

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