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Arcade
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Platform:

IPM Invader

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Notes:
Release type:
Units produced: Irem
Controls/Input Device: Control(joy8way), Buttons(1)
Number of Players: 2
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MAME folder name: ipminvad

Display: raster 240x224 @ 61.78Hz (61.78 pixclock)
Sound: 1 channels

Emulated in MAME via driver m10.c:
Status: imperfect; Emulation: good
Graphic: good; Sound: good; Color: imperfect
Palette size: 16; Savestate: unsupported

Roms:
b10r with 1024kb
sha1:0154eae62585e154cf20edcf4599bda8bd333aa9 crc:be4b8585
b1r with 1024kb
sha1:93ac65d3ac725d3e4c2fb769816ee808ab609911 crc:f9a7eb9b
b2r with 1024kb
sha1:6a74fcc7cb1627b1c427a77da89b69ccf3175800 crc:af11c1aa
b3r with 1024kb
sha1:8771a34f432e6d88acc5f7529f16c980a77485db crc:ed49e481
b4r with 1024kb
sha1:135500fc17524e8608c3bcfe26321144aa0afb91 crc:6d5db95b
b5r with 1024kb
sha1:75e47eacd429f48f0a3a4539e5ecb4b1ea7281b1 crc:eabba7aa
b6r with 1024kb
sha1:14903bfc9506cb8e37807fb397be79f5eab99e3b crc:3d0e7fa6
b7r with 1024kb
sha1:6fe3ce208334321b63ada779fed69ec7cf4051ad crc:cf04864f
b9r with 1024kb
sha1:ba13a856477fc6cf7fd36996e47a3724f862f888 crc:56942cab
Mameinfo.dat entry:
0.37b10 [Yochizo]


WIP:

- 0.147u2: hap fixed clone Omega Fighter Special. The game fails to boot or finish post. After showing bad rom errors, the game resets.

- 0.147u1: Fixed maincpu rom loading.

- 0.122u7: Fixed gfx1/2/3/4/5 rom loading.

- 0.89u3: Changed Z80 CPU2 clock speed to 5MHz.

- 0.37b10: Yochizo added 'Omega Fighter' (UPL 1989) and clone Omega Fighter Special.

- 21st November 2000: Yochizo fixed some graphics bugs in the Omega Fighter / Atomic Robo-kid driver.

- 8th November 2000: Yochizo sent in a driver for Omega Fighter and Atomic Robo-kid.

- 25th April 1999: Dumped Omega Fighter Special.


LEVELS: 8 (restarts once)


Other Emulators:

* FB Alpha

* JFF

* Raine


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Romset: 2016 kb / 8 files / 457.8 zip


Credits Mameinfo and Mametesters Project Robert J. Rabgno et al.
History.dat entry:
IPM Invader (c) 1979 IPM Corp.

- TECHNICAL -

Main CPU : MOS Technology M6502 (@ 2.5 Mhz)

Screen orientation : Vertical
Video resolution : 224 x 240 pixels
Screen refresh : 60.00 Hz
Palette colors : 8

Players : 2
Control : 2-way joystick
Buttons : 1

- TRIVIA -

Released in January 1979. Known as the poor mans version of "Space Invaders".

Irem was founded in 1974 as 'IPM Corp.' in Hakusan, Japan. Like most of their contemporaries, the company's initial purpose was to produce and rent out electronic leisure machinery to various sections of the entertainment industry. With the advent of arcade videogaming and the hugely popular "Space Invaders" (1978), Irem opted to move into the development and manufacturing of their own titles. They rapidly released their own 'invader clone', the aptly named IPM Invader.

IPM Invader was a crude and shameless copycat of Taito's milestone, but yet the sheer popularity of arcade rooms at the time saw the game do well enough to convince the company that games were a viable business opportunity.
In 1979 they changed their corporate name to Irem Corp., an acronym for 'International Rental Electronics Machines'. This would stand until the mid-80s, when it would then be changed to 'Innovations in Recreational Electronic Media'.
For their first few years, Irem's output was average at best. If anything it could almost be considered poor: random invader clones and poorly produced action games disappeared amongst the numerous other titles of the day.

- UPDATES -

It is like "Space Invaders", with identical graphics. It uses a color monitor instead of a black and white monitor with a color overlay.

It has the addition of the famous 'coffee break'. What's the 'coffee break'? The 'coffee break' is a unique feature in IPM Invaders whereas after every 3rd wave or pattern of invaders, the 'coffee break' appears.

Another unique feature in IPM Invader is the 'capsules'. When dip switch settings are changed to advanced settings, the game becomes more difficult with the introduction of the UFO (mystery score ship) dropping 'capsules' that hatch into new invaders. The 'capsules' cannot be destroyed until they hatch, and are dropped across the screen to defeat the players 'narrow column' strategy.

- SCORING -

Large Invader : 10 points
Medium Invader : 20 points
Small Invader : 30 points
UFO : 50 to 300 points

- CONTRIBUTE -

Edit this entry: http://www.arcade-history.com/?&page=detail&id=1200&o=2


Licensed from Alexis Bousiges under a CC Attribution 3.0 License
cheat.dat entry:
00000000 0080 00000008 FFFFFFFF Infinite Lives
20800000 1957 00000000 FFFFFFFF Bullet Invincibility

Credit Pugsy's MAME Cheat file
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