Irem Invaders was indeed VERY common in Australia. The place I worked at imported at least tables of these directly from Japan – they. This is a pretty unique Space Invaders hack, based around the instead of the Also features a ‘coffee break’ between waves!. Released in January Known as the poor mans version of “Space Invaders”. Irem was founded in as ‘IPM Corp.’ in Hakusan, Japan. Like most of their.

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So the game uses seperate syncs, the horizontal sync is negative, and the Vertical sync is positive.

Feel free to take it and do anything you like with it. This isn’t the fault of the scan, that’s just what it’s like on the real document. The circuit board layout in the document also matches my particular boardset revision which is a different revision than the one that the original poster has.

Now i’ve sent the pcb back to the owner and a full set of schems turns up!!! In they changed their corporate name to Irem Corp. Dez – I can smell a new board set project coming on for you Good stuff, nice neat fix, hate to see boards with Sinclair-esque dead cockroach style fixes with chips splayed and spliced in. Here is the file 13MB: Another unique feature in IPM Invader is the ‘capsules’. Guys, I had no idea how in-demand this document was. I don’t use Acrobat – I use Foxit reader.


If you still have no luck, let me know. If you already downloaded it, please grab the new one. What’s the ‘coffee break’?

Yeah who made it? Just edited the brackets out of post 1 title So email link take you to the latest post – – – Updated – – – Yeh i’ve spent a tonne of time on this pcb now, and while the cpu is able to trigger the sound properly, the ufo noise just doesn’t sound in-game which is very odd.

Also features a ‘coffee break’ between waves! Cheers Would you like me to mirror that on my site? However after fixing all the sounds, and then triggerign them in-circuit using my fluke they are all there, but the game code doesn’t appear to trigger the UFO noise at all, even though its there and works perfectly under cpu control.

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.

You’ll know you have the new one if the front cover is beige rather than greyscale. So, it looks like this document is indeed for IPM Invader?

IPM Invader arcade video game by IPM ()

My changes are in yellow: It has the addition of the famous ‘coffee break’. MOS Technology M 2.

Known as the poor mans version of ” Space Invaders “. These days you are likely to want to play this game in a JAMMA cabinet or other monitor with more ‘normal’ sync, which means it needs to be composite negative sync.


The ‘coffee break’ is a unique feature in IPM Invaders whereas after every 3rd wave or pattern of invaders, the ‘coffee break’ appears. Without schematics, its a time sucker right now.

Firstly, the pinout i found online was incorrect infader a few areas, so i’ve copied and modified it so it is now accurate. Most space invader pcbs and clones suffer from missing sounds, and the pcb i have in front of me is no exception. You’ll notice that some of the writing on the schematics is barely legible.

It is like “Space Invaders”, with identical graphics. What would be the best way to share this file in a permanent manner? If you’ve read my PONG colour conversion pageyou’ll know that ‘s are basic TTL building blocks, so its easy to make the gate you need. Dropbox, SkyDrive, or Google Drive share.

IPM Invader

It was a “rip-off” so I’m not surprised. Yeah that be me: So we need to find where these syncs come from, go get your pcb and look here: To do this, we can join the Irej gate in the following manner to turn it into an inverter like this: Happy to give credit where it’s due.

Irem was founded in as ‘IPM Corp.

Anyway, i wrote up a tech page on my website that explains what you can do about it: