Chipdir has what appears to be a complete list of all of the PIA's including
the 8255, 6820, 6821, 146823 and a bunch I had never heard of before.

http://www.xs4all.nl/~ganswijk/chipdir/f/periph.htm

Paul

> -----Original Message-----
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Russell McMahon
>
> > 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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