Document Title: [Venture tech.html (html file)]
There are two boards to the Venture boardset, the logic and the audio board.
The audio booard is labeled with:
Exidy Inc.
Copyright 1981
PCB 77-3387-14
ASY 77-3387-15
Audio/Color ---
|B|
---
And the logic board is labeled with:
PCB 77-3374-14 COMP
Exidy Inc ASSY 77-3374-15 SIDE
Copyright 1981 Revision E
The audio board is the top board. It has a 30-pin edge connector and 3 10-pin
connectors. Only the edge connector at P5 and the 10-pin connector at P21 are
used. The other two connectors at J2 and J3 are not used.
The logic board has two edge connectors: a 44-pin at J1 and a 40-pin at J0.
Only the 44-pin connector at J1 is used.
My guess is that the unused connectors on both boards are used for testing the
boards.
CP = Control Panel (15 pin connector, 5 rows of 3)
CH = Coin Harness (6 pin connector)
RB = Regulator Board Power Supply (12 pin connector)
PS = 5V Power Supply (3 pin connector)
AB = Audio Board
LB = Logic Board
MV = Monitor Video
The game is powered using these supply outputs:
+5V DC @ 6 amps
-5V DC @ 1 amp
+12V DC (HI) @ 3 amps
+12V DC (LO) @ 1 amp
-12V DC (HI) @ 3 amps
-12V DC (LO) @ 1 amp
J1 Logic Board
COMPONENT | SOLDER
------------------------------------|--------------------------------------
| 1 | A |
--------------------------------|---|---|----------------------------------
| 2 | B |
--------------------------------|---|---|----------------------------------
| 3 | C |
--------------------------------|---|---|----------------------------------
| 4 | D |
--------------------------------|---|---|----------------------------------
(from CP2) 8 Way Down | 5 | E | Coin (from CH6)
--------------------------------|---|---|----------------------------------
(from CP6) Fire | 6 | F | 8 Way Up (from CP4)
--------------------------------|---|---|----------------------------------
(from CP5) 8 Way Right | 7 | H | 8 Way Left (from CP3)
--------------------------------|---|---|----------------------------------
(from CP1) One Player Start | 8 | J | 2 Player Start (from CP7)
--------------------------------|---|---|----------------------------------
(*)(from CP1) One Player Start | 9 | K |
--------------------------------|---|---|----------------------------------
(from CH5) Ground |10 | L | Anti-Slam (from CH1)
--------------------------------|---|---|----------------------------------
(to RB12 and AB1) Ground |11 | M | +12V (LO) (to RB3 and AB6)
--------------------------------|---|---|----------------------------------
(to RB1 and PS3) Ground |12 | N | -5V (to RB4 and AB5)
--------------------------------|---|---|----------------------------------
(from CP15) Ground |13 | P |
--------------------------------|---|---|----------------------------------
(from CP14) Ground |14 | R | +5V (to PS2)
--------------------------------|---|---|----------------------------------
(from CP13) Ground |15 | S | +5V (to PS1)
--------------------------------|---|---|----------------------------------
(from CP12) Ground |16 | T | +5V (from CH4)
--------------------------------|---|---|----------------------------------
(to PS3) Ground |17 | U | +5V (from CP11)
--------------------------------|---|---|----------------------------------
(from AB15) Ground |18 | V | +5V (from AB8)
--------------------------------|---|---|----------------------------------
(**) |19 | W |
--------------------------------|---|---|----------------------------------
|20 | X |
--------------------------------|---|---|----------------------------------
|21 | Y | Coin 2 Input (to CH2)
--------------------------------|---|---|----------------------------------
(+) (to CP9) A/D Convert M2 |22 | Z | A/D M1 (to CP8) (+)
---------------------------------------------------------------------------
+ These are not wired on my original machine, although they are wired
to the control panel connector.
* This may be incorrect as pin 9 is not wired on my machine, but the
schematic indicates it.
** This has a green ground wire coming off the edge connector on my
machine. Maybe the pinouts are off by one on all these grounds?
Looking at the edge, pins 10 through 21 are all ground.
J5 Audio Board
Pin | Definition
------------------
1 | Ground (to LB11 and RB12)
2 | +12V (HI) (to RB2)
3 | -12V (HI) (to RB6)
4 | -12V (LO) (to RB5)
5 | -5V (to LBN and RB4)
6 | +12V (LO) (to LBM and RB3)
7 | Speaker (A)
8 | +5V (to LBU)
9 | Speaker (B)
10 | +12V (LO) (not used)
11 | -5V (not used)
12 | -12V (LO) (not used)
13 | -12V (HI) (not used)
14 | -12V (HI) (not used)
15 | Ground (to LB18)
My Audio Board has an edge connector with pins 1 and A, 2 and B, etc soldered
together. Also, whereas the Logic board lists pins 1 through 22 on the
component side, the audio board seems to list pins 1 through 15 as being on
the solder side. I'm looking at the traces on each side of the edge, and only
the solder side appears to go to any IC's, capacitors, etc. The component side
has traces going from pin A to pin S, pin B to pin R, ..., pin F to pin L.
Hmm...after looking at the traces on each side it seems to make sense that
pins 1 and A, 2 and B, ..., 15 and S are soldered together. Some of the
traces for the pins are dead ends on one side yet lead somewhere if you follow
the trace for the corresponding pin on the other side.
J21 Audio Color
Pin | Definition
------------------
1 | Red (to MV1)
2 | Green (to MV2)
3 | Blue (to MV3)
4 | HSYNC (to MV4)
5 | VSYNC (to MV5)
6 | Ground (to MV6)
7 | Unused
8 | Unused
9 | Unused
10 | Unused
This section shows how the pinouts map to other connectors and pinouts in other
parts of the system:
Regulator Board Power Supply
Pin | Definition
------------------
1 | Ground (to PS3 and LB12)
2 | +12V (HI)
3 | +12V (LO)
4 | -5V
5 | -12V (LO)
6 | -12V (HI)
7 | Unused
8 | Unused
9 | Unused
10 | Unused
11 | Unused
12 | Ground
5V Power Supply
Pin | Definition
------------------
1 | +5V
2 | +5V
3 | Ground
Control Panel
Pin | Definition
------------------
1 | One Player Start
2 | 8 Way Down
3 | 8 Way Left
4 | 8 Way Up
5 | 8 Way Right
6 | Fire
7 | 2 Player Start
8 | A/D M1
9 | A/D M2
10 | Unused
11 | +5V
12 | Ground
13 | Ground
14 | Ground
15 | Ground
Coin Harness
Pin | Definition
------------------
1 | Anti-Slam
2 | Coin 2 Input
3 | Unused
4 | +5V
5 | Ground
6 | Coin
Monitor Video
Pin | Definition
------------------
1 | Red
2 | Green
3 | Blue
4 | HSYNC
5 | VSYNC
6 | Ground
