Walter Moore waltm22 at comcast.net
Tue Jul 6 14:39:34 CDT 2004

>While working on my new H19 emulation program, I ran into a term I'm not 
>familiar with. STICK PARITY. It is an option set by the DIP switches in 
>the H19. I know that the parity bit can be missing, (N), even parity (E), 
>odd parity (O), mark (M) or space (S), but what is STICK?
>Is it some form of Mark or Space?

Yes.  This is how they get mark and space.  With the 8250, when you select 
Stick Parity, the parity bit is transmitted and received in the opposite 
state of the parity select bit (and switch).  So if you select "Even 
Parity" and "Stick Parity", you will get a space,.  "Odd Parity" and "Stick 
Parity" should give you a mark.

Check out the Line Control Register, bit 3 (Parity Enable), bit 4 (Even 
Parity Select) and bit 5 (Stick Parity) in either the H8-4 manual or the 
H-47 manual.


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