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caius

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Bought on eBay from the States a Time Soldiers PCB which arrived to me some days ago (by the way, thanks to 'coolmod' for his mediation and forwarding) :



Auction described the board as “TESTED NOT WORKING-GARBAGE ON SCREEN-MISSING CHIP”

The missing chip was actually one of four program ROMs:



I programmed a blank EPROM and finally powered the board up.All I got was a partially dimmed screen in which I could recognize the power-on TEST which probaby failed since the board kept resetting:


As usually I do, I started my troubleshooting with a visual inspection.Board was in very good shape but flipping it I noticed scratches on solder side, some quite deep :



A couple of traces looked really severed under the microscope and my multimeter in continuity test confirmed it :



Patching the broken traces fixed board completely :




The repair was pretty easy, just a quick fix hence it gave me time to look for something on the board to reproduce.The long custom SIL marked 'ALPHA-INPUT84' was a good candidate :



This custom IC handles inputs and Time Soldiers, being a rotary joystick game, uses four of them (two for 8-way joysticks of both players and the other two the 12-way rotary joysticks).Later Alpha-Denshi games like Gold Medalist use a part marked 'ALPHA-INPUT87' that externally is identical but with slight internal differences :



The two parts are not interchangeable but I was able to merge both designs in a single reproduction part: :



Testing on PCB was successful on Time Soldiers PCB, all directions of both players worked with 8-way joysticks (could not test rotary because I don't have them)


Another PCB and custom IC preserved!
 
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Hammy

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Superb! This is used on a lot of games!

Gold medalist
Gang Wars
Time soldiers
Sky Adventure
Ikari Warrior 3
Kyros
Super stingray
Paddle mania
Sky soldiers
Super champion baseball
+many more!
 

caius

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Thanks for the list!Maybe not the most wanted reproduction but it's always good to have it in my opinion ;)
 

Hammy

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Thanks for the list!Maybe not the most wanted reproduction but it's always good to have it in my opinion ;)
The other parts on this board are quite good, all hitachi and stuff.
With this input repro available it makes the hardware simple and easy to repair / maintain :D

It will be used on many others too, the list is just what have seen over the years / common stuff.
 

Mrhide

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The repair was pretty easy, just a quick fix hence it gave me time to look for something on the board to reproduce.The long custom SIL marked 'ALPHA-INPUT84' was a good candidate :

You almost seem sad that it was so easy ! :rolleyes: Who else would say "we'll it's all working but let's try to reproduce something, just for fun"

amazing.


Now you make me wanna find a board for my rotary joystick!
IMG_3568.jpg

Thank you !
 

caius

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You almost seem sad that it was so easy ! Who else would say "we'll it's all working but let's try to reproduce something, just for fun"

amazing.
Ahahahah!Thanks.Well, we are not speaking about a 'CPS-A-01' or other full digital ASIC so the part was really easy (for me at leat) to replicate.Here 's the "naked part" :




Now you make me wanna find a board for my rotary joystick!
And I'm looking instead for a rotary joystick!it seems they are not really cheap and easy to find.
 

caius

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The other parts on this board are quite good, all hitachi and stuff.
Yes, it seems all boards from Alpha-Denshi manufacturer make massive use of Hitachi TTLs which are well known to be reliable unlike Fujitsu and Texas Instruments ones...
 
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