titus-larsen-titus-1981-apple-interfacing

Fig. A-3, two outputs are available. With the switch i11 the .,'""'"'
shown, the normal logic states are shown at the outputs of two
gates. When the switch is moved to the other position, the outputs
of the NAND gates will switch. It is suggested that a momentary
switch be used in the pulser circuits.
Lamp monitors, logic switches, and pulsers are all useful devices
when breadboarding logic circuits. While the circuits shown in Figs.
A-1 through A-3 are simple, you may not wish to build them yourself.
Several companies produce digital breadboarding devices that
incorporate lamp monitors, logic switches, and pulsers, as wen as
other digital functions. We suggest that you write to the following
companies for information about their digital-electronic breadboarding
systems :
E & L Instrnments, Inc.
61 First Street
Derby, CT 06418
AP Products, Inc.
Mentor, OH 44060
PACCOM
14825 NE 40th, Suite 340
Redmond,WA 98025