[sdiy] 6850 acia

Scott Gravenhorst music.maker at gte.net
Thu Aug 15 09:16:34 CEST 2002

I've used and programmed these.

6850 1 MHz
68a50 1.5 MHz
68b50 2.0 MHz

The a/b paradigm denotes speed as shown above for all 6800 series parts. 
(Not 68000).  I don't have a scanner, but I'll do the best I can to get you
info like pinouts, what registers do what, etc. as I have the Motorola docs.

Also, google spit this out for "mc6850":

small PDF, has probably what you want.  I found the site very slow, so if
you can't get it, email me privately and I'll email it.

greg montalbano <greg.montalbano at ucop.edu> wrote:
>anybody here have experience with these?  I've been all over the usual 
>websites, trying to find data sheets -- I need to know:
>1)  what's the difference between 6850, 68a50 and 68b50?
>2)  is it possible for the receive portion of the chip to work, while the 
>transmit portion is buggered?
>Any info appreciated --

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-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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