Chip Tuning Warszawa

24 thoughts on “Found a 44 Year Old Error In The SPACE INVADERS Arcade Schematics Midway & Taito Classic PCB Repair”

1. I have this exact machine in the basement waiting for me to try to diagnose and put back together.. glad I saw this before tackling this or I'd have been confused with the schematic inconsistencies!

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2. But now the Y is the wrong way down!

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3. I found a file you were looking but for the Midway version at https://www.arcade-museum.com/manuals-videogames/S/SIDeluxe.pdf
   It is schematic part No. M051-00851-A002
   Game Logic P.C A082-90700-A000
   Used on Space Invader II Cocktail, Deluxe Space Invader Upright, Deluxe Space Invader Cocktail.
   It has the invader hit at top and saucer hit at bottom on page 27 of the pdf 🙂 (if you didn't already find it)
   Id love to build the simpler audio effects circuits but the 76477 can go jump cos i bet that's impossible to find that chip nowadays. The 556 and opamp circuits look simple enough and an Arduino could drive the inputs to control them. I know not quite retro enough but a compromise for those just wanting the sounds for some reason as authentic as possible. The 3 input AND gate chips and 7417 are just buffering except M3 which is injecting a 480Hz signal into the Bonus Missile Base sound from one half of the 556 Timer and the 74174 is a flipflop circuit that again just looks like it is buffering and logic control. Not really needed with modern equivalents. The Noise circuit is just an XOR feedback system into a static shift register to simulate random noise, again simple enough.
   Old analogue sound generators are much more rich in tone and beef than any digital knock off. Plus they have the advantage of being easily tweaked and tuned to personal preference.

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4. "There's a loose screw somewhere" 😄

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5. I was watching my favourite 80s tv show 'Only fools and horses' the other day and they have a space invaders arcade machine sat proudly in the corner of the pub. Different design on the side of it though, maybe its not midway version?

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6. Opportunity missed!

   “There’s a loose screw somewhere…”

   “My brother has a channel called My Brother Donnie…”

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7. A separate circuit for each sound? How inefficient they were in those days.

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8. I counted the sounds, it;s 10. Not 7.

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9. "Just ONE MORE GAME…!"

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10. I started wondering what the "bass" melody reminded me of… but it must be this: https://youtu.be/hZMf716hCZw

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11. Also either you're shooting really fast two at a time or you have double blast as well in the sounds I couldn't tell which one. It looks like you might have some more strange magic. 🙂

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12. Something sounds different about the sound when you shoot the invaders but I don't know if that's Midway specific or not. play another version of the game if you have it and you'll hear what I'm talking about.

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13. "Increase speed, drop down and reverse direction!" – Emperor Lrrr 😅

    Love the backdrop on this version!

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14. Hey I have a TKG4 Donkey Kong PCB, graphical glitch starts and hangs can u guys fix it for me? 🙂 I thinks it's a ram problem.

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15. The reason all 3 of those early manuals are wrong is because they were just copied :).
    No one bothered to check if the original was correct. Come on people …. lol 🙂
    Space Invaders is such a classic. Thanks for showing this one off.

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16. thanks for this video. I have a broken explosion sound. This will help heaps.

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17. He's hooked, he's hooked, his brain is cooked!

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18. Fun fact!
    The increasing falling speed of the invaders was never intended, but as the CPU had less to draw, it could update the animations more frequently!

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19. So basically the way I understand it, each of the sounds that this Space Invaders arcade game is capable of making, are produced by what are essentially analog synthesizer circuits.

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20. I think the Saucer Sound circuit has to be working in a way cause if it wasn't, then by logic you wouldn't be hearing any Saucer Sounds at all, that's assuming that the Saucer Sound circuit produces all the Saucer Sounds.

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21. Joe, the level of details you provide about the games, components and history in the videos are amazing. Thanks for sharing!

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22. I remember the very first time I saw one of these Space Invaders arcade machines, I was living with my stepmother in Subiaco near Perth in Western Australia, back in 1980 or 1981 if memory serves me right, I was doing my year 6 at Subiaco Primary school at the time and my class got treated to a day at the local Rollerskating Rink, anyway, I had done quite a few laps of the Rollerscating Rink and my legs were starting to feel a bit tired, as well as a bit sore from falling on my knees, so I headed to where there was an opening in the short wall that surrounded the Rink and made my way towards a round white table and chair, while I made my way over to the table and chair I heard a really bassy "Bup…Bup…Bup…Bup" sound and I went to investigate where it was coming from, it turned out to be a Space Invaders arcade game and I thought it was the coolest thing i had ever seen, the sounds it was making were pretty scary, I was probably about 10 or 11 years old at the time, I'm 53 years old now, if my memory serves me right, the Space Invaders arcade game I saw just had a black and white screen on it but looked a lot like the one in this video.

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23. I've seen this happen before due to them forgetting to update the included schematics when they went from prototype to production boards.

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24. Taito – tie toe

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