25 Aug
2014
25 Aug
'14
1:22 p.m.
On Sun, Aug 24, 2014 at 11:48 PM, Eric Smith <spacewar at gmail.com> wrote
of asymmetric TTL drive capability:
I would say it's rather moee than that, it ahs to start something happening.
Consider the Centronics interface. Pin 1 is called stb/, clearly standing
for 'strobe' (the '/' means actuve low). A low pusle on that causes the
priter to read the chracter on the data lines and do soemthing with it
(store it in the printer's buffermemeory, print it directly, depending on
the type of pritner).
Theacknowledge signal, Ack/ on the same interface is also only briefly
active (it pulses low after the printer has processed the current character
and is ready for the next one), but I would not call that a 'strobe;
-tony
That's also why strobes are almost always
negative logic (active low).
On Mon, Aug 25, 2014 at 9:22 AM, drlegendre . <drlegendre at gmail.com> wrote:
Interesting, but I'm not sure what a strobe
(signal) is.
A signal that causes an action by being briefly in an active state, and the
rest of the time in an inactive state.