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R-Register
G-Register
In Bus ~
Line
(b)
Driver . .
Figure 3-2.
SAL Control
To control the turn-on of the SAL, we
can use capacitive coupling to another
device called a line driver (a and b in
Figure 3-2).
So, if we impulse the driver, a pulse
through the capacitor turns the SAL on.
and its output can gate the contents of
R to the in-bus.
3-2
Out Bus
+-
S-Register
Now let's build a little.
The rest
of the statement says in effect, read in
and out of the logic unit, and read in
to the S-register.
TO do this we need
three more SAL's: one for control point
1, one for control point 8, and one for
control point 5 (Figure 3-3).
He'll
couple them to the same line-driver.
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