>> It's a TTL device, not serial.
>The one does not preclude the other :-)
>The Apple mouse is TTL, and it's not serial (it's quadrature outputs as
>you said)
>A PC 'serial mouse' is serial (of course) and it's not TTL, it works at
>(approximately) RS232 levels
For some of us (including me!), our first brush with "serial" was 60mA current
loop data, a standard that I see you've ignored :-)
With some of the loop supplies being able to go up
to 50, 75, or even 100V in "open circuit" configuration, I'd *hate* to
see what would happen to TTL connected directly!
(I have to admit that I got started late enough that optoisolators were
the preferred way to go from current loop to other signaling levels... but
I do remember polar relays.)
--
Tim Shoppa Email: shoppa_at_trailing-edge.com
Trailing Edge Technology WWW: http://www.trailing-edge.com/
7328 Bradley Blvd Voice: 301-767-5917
Bethesda, MD, USA 20817 Fax: 301-767-5927
Received on Sun Dec 12 1999 - 15:54:56 GMT