The Triple Hunt Game

On the Game PCB schematic diagram, Figure 41, the symbol "P" (appearing at various inputs of integrated circuit devices) indicates a connection to +5 volts DC through a pull-up resistor. For easy reference, the Game PCB is divided into grid sections. Along the short side of the board these sections are identified by letters A through R (skipping letters G, I, O and Q because they may be easily confused with the numbers 6,1 and 0, respectively). Along the long side of the board the numbers 1 through 12 are used. For example, sheet 2 of Figure 41 illustrates the type-9316 counter P5 at the upper left-hand corner of the drawing. This device PS will be found at coordinates P and 5 on the PCB.

ONBOARD POWER SUPPLIES (lower right corner of sheet 5, Figure 41): The two AC voltage inputs to the board come from the 25 VAC and 16.5 VAC center-tapped secondary windings of the power transformer insidethe Power Supply Assembly (which is mounted on - he floor of the gun mount cabinet). The +5 volts regulated supply provides the Vcc for the board's integrated circuits. The lowercurrent-rated +15 volts and -5 volts regulated supplies provide voltages for the gun position potentiometers and for the operational amplifier in the gun position sensing circuit. The unregulated +18 volts connects to the audio driver stage for the game's speakers.

CRYSTAL OSCILLATOR AND TV SYNC COUNTDOWN CHAINS (top half of sheet 1, Figure 41): A 12.096 MHz crystal oscillator generates the basic clock frequency that is divided down to produce the TV timing signals. Insert 1, supplied with this manual, illustrates these horizontal and vertical synchronization waveforms. They are used to produce a TV monitor raster made up of 262 horizontal lines at a horizontal frequency of 15,750 Hz (256H). Synchronized with line 224 is a vertical blanking pulse that occurs for the duration of 38 more horizontal scans, resulting in the total number of 262 lines per picture frame.

Besides their use for the TV raster, the TV timing signals are also used to drive the microcomputer clock generator, in the hit comparison circuit for detecting player hits on target objects, in the sound generator, in the display RAM circuit, and various other places on the board.

Gun Position Sensing Circuit (Bottom Half of Sheet 1, Figure 41):

The two potentiometers shown on the schematic, (one for left-right position and the other for up-down position), are mounted beneath the gun on the underside of the gun mount control panel. Note that a total of 20 volts is applied across each potentiometer ( + 15 volts via pin N and -5 volts via pin 11). The wipers from these potentiometers each connect, through series resistors, to type-4016 CMOS analog switch dcvices. The turn-on and turn-off of the4016's is controlled by the LAO and LA1 signals, which are derived from the microcomputer's Address Bus signals BAO and 8A1. The timing of LAO causes its switch to be closed once during V BLANK time (once per picture frame), and the timing of LA1 causes its switch to be closed once during the next subsequent V BLANK time.

The outputs of the 4016's both are connected to the positive input terminal of the type-741 operational amplifier J12. Connected to its negative terminal is a ramp waveform produced by the circuit containing transistors Q4 and Q5, as shown in Figure 43. The V RESET signal causes the ramp to return toward zero volts once per vertical scan on the TV screen.

Amplifier | I2 serves as a comparator that produces an output when the voltages at its inputs are equal. If, for example, a gun pot voltage was 6 volts, (as indicated by the dotted line in the Figure), then the amplifier will momentarily produce an output when the ramp voltage also reaches 6 volts. The transition of the amplifier's output serves as a clock signal for Latch F5. The TV timing signals (4V, 8V, etc.) applied to the Latch are changing state continually. When the amplifier senses a comparison, the instantaneous states are retained by the latch and will rep-

i.iis

SM I

. «-.I^/K.

rit-'i

■-■I-/

'»K.

-iv.. /'

Y

. /a

' K.

\sr

'

' I

: SNI

3KJ I

ii

SMbt. Ti-

COIW Ovj

KlC-i IT

"U

Ui B

vwutg.

& POb connector

Figure 39 Game Harness Schematic Sheet 1 of 2

Figure 39 Came Harness Schematic Sheet 2 of 2

ÖOTTONA VlEVsJ OF TAPE DECIC

Figure 40 Tape Deck Wiring

Figure 41 Came PCB Schematic Diagram Sheet 1 of b

f —

p

-i°vy 'H

p- 3

_d

k'4 «Ie

u 1

! VJ

Figure 41 Carne PCB Schematic Diagram S heel 2 of f>

Figure 41 Game PCB St he mal« Diagram Sheet 3 of 6

SA¿ fcH 6A.J ÓAÍ Ü«. V ÍA.7 Ó Aft -b,-9 ■ T.4 ' 1.5 -

U

!>e

|:S

^oe^oa-o"

OOSÚSMj.

oof

4CÍÍ Oí

7

. . -

Ai

3

AS

¡7

■5

M

1}

'i

M

en

C£¿ cTl

CU C£|

«2

¿27

j-llj»

MU*

"ir

KO

■t

AIA

1

">JO|

Al

4

Ai

i

U

Ai

7

a

V'OA

Si-A

Figure 41 Carne PCB Schematic Diagram Sheet 4 of 6

Figure 4t Game PCB Schematic Diagram Sheet "> of <>

r— T«.tt V »» ^p^--ti.. ■■•O"'»»0L.

r— T«.tt V »» ^p^--ti.. ■■•O"'»»0L.

V fO*> QAW VJVR-.TÉ

H

i* pOrí

re.

Tí.

DO 1

—*

Ö&4

10

SO 5

.2

Figure 41 Game PCB Schematic Diagram Sheet f> of b

>

Figure 41 Game PCB Schematic Diagram Sheet f> of b

Figure 42 Gdme PC B Sheet 1 of 4

Item

Part Number

Qty.

Description

1

007533-01

1

PRINTED CJRCUIT

BOARD

2

10-5100

2

RES, CARBON 5%,

¿W, 10 OHM

R11 , 16

3

10-5102

26

11 11 11

1K "

RI,2, 4-6 ,8,13,17, 46,52,66-69 72,102,91-96,107-109, H1

it

10-5103

12

11 11 11

10K "

R10,1 5,^5,7 6-79, 81-83 36,89-90

5

10-5104

2

11 H 11

" 100K "

R56.57

6

10-5105

2

11 11 11

" 1MEG 11

R47,75

7

10-5151

1

11 ti 11

150

R3

8 q

10-5153

1

it m 11 ti 11 11

n

R62

10

10-5220

2

11 11 11

H 22

R 7,12

1 1

10-5221

2

Il M II

n 220 "

R63,65

12

10-5222

3

Il II II

2.2K

R55,74,84

13

10-5224

2

Il II II

M 220K "

R48,51

14

10-5273

2

Il II II

n 27K n

R61,103

15

10-5301

1

Il II II

11 300 11

RI 00

16 17

10-5331 10-5332

29 1

" 3.3K "

R59

18

10-5333

1

Il II II

1. 33K n

R58

19

'0-5392

1

Il II >1

" 3.9K "

R54

20

10-5394

1

Il II II

390K 11

R87

21

10-5471

3

Il II M

470 "

R64, 73,104

22

10-5472

3

Il II II

" 4.7K "

R9,14,80

23

10-5473

2

Il II II

n £,7K i.

R60,101

¿4

10-5203

1

Il It '1

" 20K "

R45

sa

o

S3

£

**

R

?

¿ ?

-

s ? r :

3ΣI2

á

S3

S 5 : î S ï î

ll j ct uj

ll j ct uj

llil III S

ssss s es s

. - ,, rf^.V. H s, î s 5 s ; s s : « ¿ ™s:?k.°¿ r ¿

<><_><_> l_l LJ L; " M i' w H u V

n^mn

ï o

3

i sT

i : .

3 : :

S :

,ï s :. - r r- ? s a ,'» i. -■> i ; ; i. i :

<\» »V rv| IN r»| rs «■•» »N c-i s o i .¿ .'. ; .i .i ,!. ,•■.

MUim s i

¿ R s !.•, SÎ5S is u. ;; í. :8 r: X sí ï ;; r. •:: 7' v.

resent the gun shot position on the TV screen. But this gun position data is not sent out onto the Data Bus (signals DO through D7) until the 8T97 Tri-State Devices are enabled (by the D-A LATCH signal going to low), But although the gun position data is updated once per picture frame, the shot picture will only appear (at the corresponding spot on the screen where the gun is being aimed) when the player pulls the trigger.

SWITCH SENSING CIRCUIT (Lower Left Corner of Sheet 6, Figure 41):

The BAO, BA1 and BA2 signals from the Address Bus are applied to decoder E11 to produce a set of interrogation signals that test the settings of SW1, the operator option switch. In a similar fashion the BA.iand BA6 signals are applied to the "selcct" inputs of multiplexer F11. Contacts from the self-test, start, slam, trigger and the two coin switches, and two sets of common outputs from SW1, are connected to the input side of F11. The F11 outputs, pins 7 and 9, comprise the switch data lines which interface to the microcomputer system through Tri-State device F7.

0 0

Post a comment