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5.4
The
Game
and
(PL2) on the Motherboard)
The major function of this card are:
to count the number of coins and hence the number of
(i)
players in the game.
to sequence the players'
(ii)
button
(iii)
to distribute the score pulse train (from the SPC card
(PO-09) to the appropriate PSD card).
to reset the game to a
(iv)
The pulse from the coin mechanism,
IC12 which clocks a 4 bit shift register IC18.
buffering,
(a) through (d) and are routed to each PSD card.
currents to pass through the players score LED's).
'mode control'
have a parallel input.
the first coin is inserted (see sect 2.4).
this,
it being set by a 'player change' signal (PO-11) or by the
machine being powered up.
Operation of the 'player change'
monostable, IC24 which, if LO-15 is a logic 1, will trigger
stable IC22.
scoring as the SPC card and signal Pl-25
circuit on the LDPS card, RLl
the
caption'lamps, changing THROW DARTS to REMOVE DARTS as the
illuminated caption for the 5 seconds).
IC22 output is or-ed with the coin mechanism pulse in IC6
gate 1 and buffered in IC3 gate 1 to give PO-17.
the WBD card to reset the BUST register.
gate 1 also is used as the clock for a second 4 bit shift register,
The combination of gates using
of IC'S
15, 4 and 17 control the 'mode control' input of ICll.
Essentially they allow a parallel entry of 1000 for the first
player and then a shift right every time the 'player change' is
pushed.
If 2 players are playing, ICll
1000, 0100, 0010 etc.
0001, 1000 etc.
are output to the WBD card to signal which player is taking his
turn and Ll-03
lamp drivers on the LDPS card the caption lamps indicating whose
turn it is.
Player
Management
is
pressed
the 4 outputs of this register leave the card as LO-02
input and will allow IC18 to shift right or to
The parallel input is 1000 and occurs when
During this 5 second delay, signal LO-22 inhibits
If 3 players are playing it cycles 1000, 0100, 0010,
and for 4 players it cycles 1000, 0100, 0010,
from ICll
via
through Ll-06 is output.
(GPM)
card
turn when the player change
'GAMEOVER' condition with power on.
It is cleared by the coin mechanism pulse.
button will trigger a 5 second
operates, via a relay driver
on the Motherboard.
This output from IC6
cycles
suitable
buffering
These letter 4 drive, via
triggers
a
With
suitable
(There they allow
Pin 6 of IC18
A register,
(This
controls
This pulse feeds
16 and 20 and parts
through
1000,
Ll-07
through
monostable
controls
0100,
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