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TEST/DIAGNOSTIC PROCE.DIJRES (Continued)
"On "
Slate Logic -
Special Solenoid
"Off " Sla te - Special So l.anold~·
The Special'Swach Trigger Inpulgoe$ low. Mean-
while, the PIA line remalns high, The remaining s19'
nats: reoJerse'.their states,
..
"On" State Logic · Contralled SolenOid
"0.11" Slate Controlled 6010nold;
The Enable Input (from the PIA) gculow.
Meanwhile,
the BLANKING s.ignal remains high. The test
of
the
signats reverse the1rstates.
NOTE
As dirsCllla by the game program, Ihe Ale Seleel ·Relay.{solenoid 12}·swllches the sole-
noid ~B+power bEitween two power busses to permit actuating two groups of solenoids at
the proper times. In ~s de·eDem
izea
state, Ihe Relay connects Ihe 'circuil A pew&i' to 1B
'conlrolled" and ·switched" solenoids (lden1ilied In the lal,)"lewith
no
sutlix IIIJler or the.
lener A, after tha solenoid nUl)'1bo'r). Individual sol~noid operation then depends on tha
game program Mabllng the 9,round path for solenoid actuation, via .the drille/ transistor
assoclated with each 9,O!enoldclrcult. For example, the game :program can actul;lie the
Outhole kicker solenoid (sol'. 0IA). via the ddver ttam:dstor 033.
When the game program determines that the
Ale
Select Relay
(sol.
12) must be ener-
giloctilie re.layconneCts
'eil'QuilC
pewet 10 eigh1.group
C
solenOids
(Ole
through
08C)~
Now, driver transislor·033 can actuate Iha Relaunoh Flashlamps circuit
[sol, ai
C). Using
Ih'is "multiplex:ing'
technique, 'the. same driVer Iransistgr can control actuation of "two
separate solenoid circuits.
.
Oro
'H189
Bulbs
8F1
2,:SA
1
s-a
Typical
~m
fj,'tltIf!JlN1Jf)
+25V
CirCUit
sh.owing
the Function
or Ale
Select
Rela y~Sol.
12
Figure
2.
Typical Soienold
A)C
Select
Relay Circuli