IPM Invader

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The purpose of this site is to document as much information on the little known Space Invaders rip off, IPM Invader. For those who are not aware of IPM Invader, it is the game that has a 'coffee break' after every 3 waves of invaders. This has always fascinated me and I enjoyed reaching the 'coffee break' when I was young.
 
GAme Facts
Manufacturer
Year
Type
Players / Control
Monitor Information
IPM* / IREM
1978-79˜
Shooter/Space
2 Alternating / 2 way joystick

Raster. Vertical.
screen aspect: 3 x 4.
resolution x: 224 pixels.
resolution y: 240 pixels.
colors used: 8.

 
 
 

Technical

In this section I will be documenting all the technical data available to me on IPM Invader. Pin outs, schematics, manuals, pcb revision numbers, pcb sound boards, pcb cpu/rom boards and pcb pictures.

IPM Invader is also a Dual sync game meaning it has separate Horizontal and Vertical outputs, and many have been modified to composite negative Horizontal sync because they won't work on most monitors. Thanks Jomac.

I have managed to track down some pinouts thanks to a friend of mine. Thanks Geoff.
*Updated - 11 December 2013. Thanks to Andrew Welburn for some fine electronics work.

*Updated - 12 December 2013. Manual and Schematics finally found. Thanks DisQo and yohansen.

IPM Invader Pinouts
      (confirmed on M-11s-1 PCB)
Solder Side
    Parts Side
-------------------------------------------------------
Ground
44
43
Ground
(+) 5 Volts
42
41
(+) 5 Volts
(+) 5 Volts
40
39
(+) 5 Volts
Coin 1
38
37
Test Switch / Coin? (hangs the game if grounded)
N\C
36
35
N\C
N\C
34
33
N\C
N\C
32
31
Video Blue
Video Green
30
29
Video Red
1 Player Lamp
28
27
2 Player Lamp
Speaker (+)
26
25
Speaker (-)
(+) 12 Volts
24
23
(+) 12 Volt
(+) 12 Volts
22
21
(+) 12 Volt
H-Sync (negative)
20
19
-
-
18
17
V-Sync (positive) 62hz
P1 Start
16
15
P2 Start
P2 Fire
14
13
P1 Fire
P2 Right
12
11
P1 Right
P2 Left
10
9
P1 Left
N\C
8
7
Coin Counter
(-) 5 Volts
6
5
(-) 5 Volts
Ground
4
3
Ground
Ground
2
1
Ground

To download the pinouts click here.
To download the Manual (with schematics) click here.

 

Sound
Which pot does what?
[write to $a000]

BIT POT Sound
0 VR2 base shoot
1 VR1 base explode
2 VR3 invader hit
3 VR4 life extend (bonus)
4 VR5 fleet move - low tone
5 VR6 UFO hit
6 VR7 fleet move - high tone
7 VR19 volume
VR10 controls frequency
UFO noise
- VR8
Volume for all sounds

Credit: Andrew Welburn.

Thanks go to Carmel Morris for supplying me with photos of an original IPM Invader cocktail control panel.

IPM Invader Control Panel


Here are some pictures of a working IPM Invader board set.

IPM Invader PCB
IPM Invader PCB
IPM Invader Converted from Sky Shooter


I have recently translated the Japanese writing (katakana)that is located on the board connectors, and it says 'Su-ka-i Shi-yuu-ta'. Actual translation is: (Sky Shooter). A converted PCB set. Numbers on this board set are:

  • Top board (sound) = M-10S-E
  • Bottom board (cpu/rom) = M-10L-E

This pcb is now happily running IPM Invader.

Another board set that is not working is pictured below.

IPM Invader PCB
IPM Invader PCB
IPM Invader PCB

Numbers on this board set are:

  • Top board (sound) = M-10S-H
  • Bottom board (cpu/rom) = M-10L-C

Here are another 2 different board sets from another friend.

1st set
IPM Invader PCB
IPM Invader PCB Edge Connector
2nd set
IPM Invader PCB
IPM Invader PCB Edge Connector

Numbers on the 1st board set are:

  • Top Board (sound) = unknown
  • Bottom board (cpu/rom) = M-10-L

Number on the 2nd board set are:

  • Top Board (sound) = M-10S-E
  • Bottom board (cpu/rom) = M-10L-E

 

 

Finally I have a board set which is not working and it's a weird revision too.

IPM Invader PCB
IPM Invader PCB

Numbers on my board set are:

  • Top board (sound) = M-11S
  • Bottom board (cpu/rom) = M-11L
  •  

As you can see, there clearly were several hardware revisions when Irem was manufacturing these pcb's.

 

Will have manuals and schematics up shortly. I hope.

 

IPM Invader ROMS have been dumped for the mame project but due to the Irem skychut.c driver not being the best it could be, the game play is average at best in mame. I hope the skychut.c driver is improved in the future.

Some more images of IPM Invader (click for larger image)

IPM Invader Control Panel
IPM Invader Control Panel
IPM Invader internals
IPM Invader
IPM Invader PCB
IPM Invader
IPM Invader
IPM Invader
IPM Invader
IPM Invader
IPM Invader
IPM Invader internals
IPM Invader internals
IPM Invader coin slot
IPM Invader tag
IPM Invader Instruction Card
IPM Invader circuit
IPM Invader circuit
IPM Invader circuit
IPM Invader circuit

 

 
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