From: utzoo!decvax!cca!EJS@Mit-Mc@sri-unix
Newsgroups: net.micro
Title: 6850 SIO ACIA
Article-I.D.: sri-unix.3283
Posted: Wed Sep 15 13:49:41 1982
Received: Thu Sep 16 01:52:05 1982

From: Eric J Swenson 

Can anyone give me a pointer to some documentation on 6850 SIO chips?  I
need to be able to configure the device for 8 bit/no parity/1 stop bit and
can't find any documentation on how to do it.  I've sent 03H to the device
which I assume reinitializes it, and then a 91H (since that is what the
operating system I use does).  But I'm not sure what the 91H means.  I fear
that the high order bit tells the device to use interrupts which I don't
really want so I probably want 11H.  But, can anyone tell me how to decode
the bits in this command?  Specifically, I need to know what to output to
the control port following a reset to get the 8 bit/no parity/1 stop bit
configuration.  Thanks.