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Author Topic: ServoStik Review  (Read 33052 times)

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jasonbar

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ServoStik Review
« on: May 04, 2013, 03:22:57 pm »
It's taken me a while to get around to installing my 2 new ServoStiks, and installation itself took a while, too. Here is my review...well, a whole lot of disjointed numbered bullet points is more like it...



1 - Design. Totally clever, easy to take apart & work on, etc. I love how the 4 microswitches are captured by the restrictor plate. Slick!

2 - Throw. Going by subjective feel, the ServoStik feels much much better than my old Mag-Stick Plus. The ServoStik's throw feels far longer. Compared to my "main" Player One stick on my panel (a Happ mechanical rotary stick), the ServoStik throw isn't as satisfying (in terms of distance thrown off of neutral), & the square restrictor feels funnier than smooth "round" motion, but it holds up OK. The square restriction seems like something inherent to a switcher stick, so I'm not counting it as a drawback, just noting that round restriction feels nicer to me in 8-way mode than square, in general.

3 - In my order was a baggie with 5 little set screws. Where do these go? In this same order, I also got a steering wheel for Ultimarc's spinner, but that had no set screw holes in its hub...

4 - I found that 1 of the Fiberglas motor mount boards interfered with a button near the joystick. It was a simple matter of taking a beefy set of angle cutters, snipping the board, & then sanding the rough edges smooth. I wasn't using the board to mount the controller PCB anyway, so I didn't need that Fiberglas real estate, & that portion of the board is not in the load path between the mount fasteners & the motor mount features, so there was no harm in trimming it.

5 - Based on the presence of ejection pin circles, the white restrictor plate looks to be injection molded. However, the 4 "banana" shaped slots to clear the mounting screws appear to have been cut with a mill or router. These features were "hairy" as heck, with tons of dangling material. Not wanting to have little white plastic hairs falling into my control panel over time, I deburred these slots. Upon further inspection, these holes provide generous clearance for the 4 assembly screws that pass through them--why weren't these slots injection molded to save cost? The central square/diamond restriction feature also appears to have been machined but deburred nicely before shipping. All other features look to be as-molded: foreshadowing--see #13 below..

6 - During assembly & handling, I accidentally pulled off 1 wire from 1 motor & damaged the other wire tab on the same motor. Be careful when handling: small wires & small tabs! Consider potting the tabs or adding strain relief. On my 2 ServoStiks,I re-soldered all 4 tabs on both motors & then potted the connections w/ hot glue & then also looped the motor wires through the motor retention band twice for strain relief.

7 - Speaking of the motor retention band, it's totally clever. I've never seen this means of mounting a motor to a gearbox before. I wanted to remove the to inspect it & look inside gearbox, but I feared breaking the elastic band in the process--if I accidentally snapped it or introduced a cut while prying it off, it would be difficult to repair or replace. Wonder how this band lasts long-term. Any heritage for reference?

8 - The compression springs. 1 spring was in the wrong place in the sandwich: between restrictor plate & microswitch, not between screw head & washer. Upon many disassemblies & reassemblies in my troubleshooting (see #13 below), I noticed that the springs often pass through the plastic washer holes when torquing the screws, so they end up not performing their job of keeping the restrictor plate pushed lightly against the stick housing. The washer holes should be slightly smaller or the spring ID should be an little bigger to prevent this. I imagine that vibration & handling over time might lead more springs to weaseling their way into the washer holes.

9 - When reassembling the joystick, make sure that restrictor plate is seated--sometimes requires a decent press to snap it in (see #13 below for related discussion). Seating often requires pushing the plate in w/ your thumbs--the 4 small springs alone are too weak to seat it.

10 - Software. I'm no software guy, so I had a little trouble. I'm using these in "Hardware Mode", where pressing a momentary admin button on my CP switches them to 4-way & pressing another button switches them to 8-way. I ran the Ultimarc program (Windows 7), plugged in the driver board (no motors attached--just PCB), & Windows recognized it. (Going from memory here!) After Windows did its thing, I clicked "4-Way" & believe I saw something like "4 detected" in the little box in the program. I clicked "8-Way" & I believe it said "8 detected." I wasn't sure if this meant that the software was reading some feedback from the PCB & confirming that the command had been sent. I clicked "Upgrade FW" for fun & the USB device umounted. I made these clicks just out of curiosity, as  I was going to use Hardware Mode anyway, but I wanted to see what the software buttons did before making this irreversible change. I clicked "Hardware Mode" & got a warning/confirmation box (good!). I confirmed my Hardware Mode decision & that warning box disappeared, returning me to the program's main screen. Did it work? I don't know? No feedback of confirmation? Hmmm? I repeated the process & got the same results. I guess it worked...? Later, when I installed it into my cabinet, I couldn't get it to work at first, so I removed it, took it back to my laptop, repeated the above process, & then it did work. I'm going to lean towards operator error on that last weirdness, but the moral of the story is that I would have had an easier time w/ some sort of software message or PCB blinking LED notification or something to give me some feedback.

11 - Microswitches are super loud. This comes from somebody who's neurotic about silent button & joystick actuation, who spent hours & hours on various folded paper shims in microswitches ( http://forum.arcadecontrols.com/index.php/topic,72400.0/all.html ) & GGG Micro-Leaf switches. (I ultimately settled on Happy Cherry K-Series w/ paper shims for all buttons & Paradise Arcade Zippy "silent" microswitches for all sticks.) Flashback: because of the inherent short throw of the Mag-Stik Plus in 8-way mode, I'd found that these microswitches actuated a little too soon & make it difficult to hit the 4 cardinal directions without going diagonal (i.e., if you break up the stick's throw into arcs, the diagonals' arcs felt much longer than the non-diagonals' arcs). My solution at the time was to file the outside ends of the microswitch plungers to make the plungers .290" long, which resulted in a little more stick throw to actuate, which made it a little harder to hit the diagonals accidentally. Because the restrictor is a square & because you're pushing against a flat square side when going N, S, E, or W, if your direction of push is not quite normal to that square edge, the stick will tend to want to slide to a corner & go diagonal on you. So, I transferred my Zippy microswitches into the ServoStik to replace the stock Sanwa switches included w/ the ServoStik (swapping the lever arms & the plungers so that the ServoStik had full-height plungers). Same issue as with the Mag-Stik Plus. I could barely go N/S/E/W--diagonals were far too plentiful. (Smash T.V.'s diagnostic mode is a great utility for testing straight-vs-diagonal tendencies--I use it when fussing w/ my leaf switches on my "Robotron" sticks.) So, I swapped in my filed-down .290" high plungers into the ServoStik & one worked fabulously, while the other was now adjusted too far & I couldn't hit 1 of the diagonals in 8-way mode. So, another plunger swap back to the stock plungers (.305" high or so, I think?) from the ServoStik's Sanwa microswitches & that second ServoStik was now behaving nicely & quietly. (I used to be a machinist, BTW!) Moral of this story: you might want to fuss w/ the switches...if you're a fussy guy...

12 - Musing on restrictor feel. I wonder if these 4-Way/8-Way adjustable sticks in general could have their straight square sides bowed out slightly. I sketched this up quickly (see attached), not paying too much attention to proportions. The dotted lines represent the existing designs & the solid lines represent my idea. In 8-Way mode, pushing in one of the 4 cardinal directions might result in fewer undesired diagonal actions if the user is pushing into a shallow "pocket" instead of against a flat surface. Diagonal actuation in 8-Way mode should not feel any different. In 4-Way mode, when sliding from one direction to the next, bypassing a restricted diagonal, there would be a slightly "rounder" & less straight travel, but the travel couldn't be *so* off-straight that the diagonal would be triggered when going from one direction to another. Just some food for thought that might improve the feel of switchers--this would probably require lots of prototypes & testing & would be quite tedious! :\

13 - The actuation needed a lot of modification to work. Out of the box, the motors would stall when about halfway through their travel. I uninstalled & reinstalled the sticks several times over, removed them from my panel & worked on them "loose" on my workbench, etc. etc. See this other guy's video for reference--I'm not the only one! There were a combination of interference/friction/binding issues that ganged up & prevented the restrictor plates from moving smoothly: a - The servo horn exiting the gearbox was too high relative to the restrictor plate & the bottom of the restrictor plate rubbed against the top face of the servo horn. b - The OD of the restrictor plate was too large relative to the 4 walls of the stick housing.

Solutions: a - Sand the OD of the white restrictor plate gently bit by bit until it spun more freely. b - Ditch the compression springs altogether & instead use another set of nylon washers to shim the restrictor plate up slightly (so it won't rub on the servo horn) & to remove the compression springs from the equation, as they tended to work their way into the restrictor plate. c - I didn't want to do this, but it seemed like a good idea & adds insurance--I put some light grease on the OD of the restrictor plate & in the restrictor plate's slot in which the servo horn boss rides. All these adjustments combined make the ServoStik servo quite nicely now. Perhaps just 1 or 2 of these 3 solutions would be enough, but I'd spent so much time on these that I wanted to really kill this problem & not have to revisit it later.

Recommendation: instead of screws with full thread, how about shoulder bolts that will bottom out at a known height when torqued into the joystick housing's threaded inserts, & then a precise stack of slippery shims/washers can be used to take out the restrictor plate's axial play, rather than use those compression springs.

Thanks,
-Jason

chopperthedog

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Re: ServoStik Review
« Reply #1 on: May 04, 2013, 03:37:17 pm »
Great write up. I know there may have been a new plate made (saw chatter about it in another thread). I had similar issues you did late last year, but you're much better at typing :). http://forum.arcadecontrols.com/index.php/topic,129335.msg1323645.html#msg1323645 I had suggested trying to source out some conical springs (he may have already since) and that would solve the springs falling through. Once all the mucking with is done it's a friggin awesome setup. There might have been some tweaks to improve them in the last 5 months. When you did you order yours?


good day.

jasonbar

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Re: ServoStik Review
« Reply #2 on: May 04, 2013, 03:42:33 pm »
Thanks--yes, thanks for bring up the tapered compression springs--those crossed my mind but I forgot to write them up--that would be a good solution. Nevertheless, I prefer removing the springs altogether & just use shim instead--I don't want to add any more friction to the setup. Also, I'm not a fan of taking pliers to the joystick base walls & bending them out--sounds a bit sketchy--will they relax & return or will I snap them off or will I go to far & make the restrictor plate loose or...? Sanding the restrictor plate OD seemed safer.

Thanks,
-Jason

AndyWarne

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Re: ServoStik Review
« Reply #3 on: May 05, 2013, 10:04:31 am »
Just a comment to say the ServoStiks are now shipping with a revised restrictor plate which has the 5 slots molded not machined and also has a slightly smaller overall diameter to eliminate binding.

The spring issue I am not aware of this actually happening in usage. But to eliminate it happening in assembly we are having washers made with slightly smaller holes.

jasonbar

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Re: ServoStik Review
« Reply #4 on: May 05, 2013, 03:08:04 pm »
Glad to hear of a redesign. But what of the issue of the restrictor plate face rubbing against the servo horn face? To fix that interference problem in myh sticks, I shimmed the restrictor plate up by putting 1 set of white Nylon washers underneath the plate. These washers, combined with 1 more set of washers under the screw head, worked out for a perfect shimming job, obviating the need for springs at all.


I found the springs sneaking through the holes just when I was assembling & disassembling my sticks repeatedly, so I predict that the springs can work their way in during play.

Thanks,
-Jason

mgb

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ServoStik Review
« Reply #5 on: May 05, 2013, 06:18:39 pm »
Nice write up on this stick.
It definitely looks like a good product.
I would like to give one a try sometime soon.
I imagine the throw in four way is comparable to a JLW in four way?

jasonbar

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Re: ServoStik Review
« Reply #6 on: May 05, 2013, 10:10:28 pm »
Nice write up on this stick.
[snip]
I imagine the throw in four way is comparable to a JLW in four way?

Thanks for reading. Sorry, I don't know the JLW. My cabinet has 8-way Happ mechanical rotaries (not sure what stick these are based on), "Robotron" 4" Wico leaf/grommet awesomes, Ultimarc Mag-Stik Pluses, & a Happ trigger-stick (Tron style, but w/ a normal restrictor plate). My write-up above already contains the only comparisons that I'm able to provide. :]

-Jason

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Re: ServoStik Review
« Reply #7 on: May 06, 2013, 05:56:22 am »
Thank you for this excellent write up. I recently purchased one to put in a bartop and I was kind of hesitant. This review provided answers to allot of questions I had about it. Thanks!!!! :cheers: :applaud:

RetroBorg

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Re: ServoStik Review
« Reply #8 on: May 06, 2013, 01:42:07 pm »
Interesting write up and good to see Andy has already revised some parts to eliminate those problems.

GernBlanston

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Re: ServoStik Review
« Reply #9 on: May 10, 2013, 01:26:39 pm »
Just a comment to say the ServoStiks are now shipping with a revised restrictor plate which has the 5 slots molded not machined and also has a slightly smaller overall diameter to eliminate binding.
<snip>
we are having washers made with slightly smaller holes.
Andy,

I haven't researched this much and hopefully it's been posted here somewhere already, but any plans to officially handle the Early Adopters that jumped on this product when it was new?  Price you pay for early adoption perhaps but I'm still hopeful that I'll be able to get my two ServoStiks working smoothly without having to MacGuyver it.

Thanks.

-Gern

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Re: ServoStik Review
« Reply #10 on: February 12, 2014, 12:34:22 pm »
What is the current evaluation of these sticks? Have things improved with the revised restrictor plate?

I'm thinking about using these on my new control panel.

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Re: ServoStik Review
« Reply #11 on: July 07, 2014, 06:25:26 am »
What is the current evaluation of these sticks? Have things improved with the revised restrictor plate?

I'm thinking about using these on my new control panel.

Same here, maybe Andy can give us an update?

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Re: ServoStik Review
« Reply #12 on: July 07, 2014, 11:52:51 am »
What is the current evaluation of these sticks? Have things improved with the revised restrictor plate?

I'm thinking about using these on my new control panel.

Same here, maybe Andy can give us an update?

I have not heard anything at all, which I hope means that the early issues with the restrictors are solved. This was a very long time ago now, with hundreds of units sold since.

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Re: ServoStik Review
« Reply #13 on: July 07, 2014, 01:10:45 pm »
FWIW, I bought one about 1 year ago, and have been using it since last September. My thoughts / issues:

1) I had a microswitch go bad very quickly after I started using the stick. Andy promptly sent me a replacement once I had reported it.
2) One of the screws which hold the restrictor in place dropped out once while playing. I had been over-cautious not to over tighten it so this was my fault really. You just need to pinch up the screws.
3) After a while I noticed the stick didn't feel quite as smooth as it could have done. I took the joystick apart, cleaned everything and used some silicone grease when re-assembling. Much better, I would do this at the point of installing the stick (any type) in future.
4) I have had zero problems (binding or otherwise) when the restrictor is being rotated.
5) For the first time I mounted the stick under an 18mm panel (not routed) with the long shaft. I think in future I would route the wood down to 5mm or so and use the normal length shaft. I don't have a big problem with how I've done it, but I feel with the normal length shaft, the throw would be slightly reduced (probably not a lot).
6) This is a great stick!

Scorpie

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Re: ServoStik Review
« Reply #14 on: July 07, 2014, 02:03:37 pm »
FWIW, I bought one about 1 year ago, and have been using it since last September. My thoughts / issues:

1) I had a microswitch go bad very quickly after I started using the stick. Andy promptly sent me a replacement once I had reported it.
2) One of the screws which hold the restrictor in place dropped out once while playing. I had been over-cautious not to over tighten it so this was my fault really. You just need to pinch up the screws.
3) After a while I noticed the stick didn't feel quite as smooth as it could have done. I took the joystick apart, cleaned everything and used some silicone grease when re-assembling. Much better, I would do this at the point of installing the stick (any type) in future.
4) I have had zero problems (binding or otherwise) when the restrictor is being rotated.
5) For the first time I mounted the stick under an 18mm panel (not routed) with the long shaft. I think in future I would route the wood down to 5mm or so and use the normal length shaft. I don't have a big problem with how I've done it, but I feel with the normal length shaft, the throw would be slightly reduced (probably not a lot).
6) This is a great stick!

Thanks for your post :) much appreciated !

The only thing I now want to know if its possible to mod the stick with an rgb led balltop :D there goes my imagination :D

Slippyblade

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Re: ServoStik Review
« Reply #15 on: July 07, 2014, 05:17:20 pm »
The only thing I now want to know if its possible to mod the stick with an rgb led balltop :D there goes my imagination :D

That'd be cool, change the ball color based on 4/8 way position.

05SRT4

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Re: ServoStik Review
« Reply #16 on: July 07, 2014, 08:18:38 pm »
That actually does sound cool, I don't think it would be impossible to do.

danny_galaga

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Re: ServoStik Review
« Reply #17 on: July 14, 2015, 07:50:18 am »
I was going to write up a review but noticed this so will add my thoughts here. First up I have to say theses are absolutely worth the money. However, much like buying say a resin cast kit model compared to a mass produced one, you are buying a very niche product that needs a little attention before installing. The things that need attention are as follows:

1) There is no inherent system to hold the screws in place. they will work their way loose over time.
2) The springs are too close to the size of the washer hole, and tend to work their way 'through' them, thus ending up on the wrong side of the washer.
3) The swash plates can be tight enough to bind and stall the motor before it finishes the full turn. If it happens to one joystick and not the other (as it did me), much head scratching ensues!

The solutions are quite straight forward, much easier than fixing up the afore-mentioned resin kit.

1) Locktite! Easy-peasy. In the pic you will notice I didn't go to town on it. Just put some where you think thread will screw in. You may end up with some on the plastic. Don't worry, it's not glue. Just clean it up the best you can with cotton tips or tissues. Tighten the screws up just tightly enough that there is a little bit of pressure. It doesn't need much and doesn't seem to me to be something that needs to be fine tuned.

2) Not as easy as the first part. You could either find some springs with slightly larger diameters, or do what I did and open up one end a little so that it can't worm its way into the washer. I used a pair of pointy nosed pliers. I suspect it wouldn't matter too much if you lost a spring, as long as you put the screw with the missing one at the opposite end to the control horn. All they do is gently apply pressure upwards.

3) My first thought was to try and remove a bit of plastic off the swashplate, but hit upon a simpler solution that works well. I simply put a tiny amount of ceramic grease on one side of each of the four swash plate contact points and then turned it so that it dragged the grease through. That INSTANTLY made it very very light to turn. If you are worried that it is too loose (I'm not) you could always just do one or two contact points.

The third pic shows what my springs ended up like, and also the grease. I used ceramic grease because I had some (it's great for N64 thumbsticks!). It's designed for plastic gears and bearings. But I'm pretty confident that vaseline would do. You only need a smidgen.

Look after those things and you should have years of trouble-free operation.
« Last Edit: July 14, 2015, 07:51:50 am by danny_galaga »


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Treguard

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Re: ServoStik Review
« Reply #18 on: April 04, 2016, 11:44:20 am »
Sorry to resurrect an old thread, but I noticed you were using this in software mode. Have you come across something that explains how to assign the switching to a button (or 2) say for an arcade cabinet setup? Thanks

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Re: ServoStik Review
« Reply #19 on: March 09, 2017, 02:47:17 pm »
I need a comprehensive list of ROMS vs 4/8 way and I plan on writing a .NET exe to shim between Hyperspin/launch and the Mame.exe.   It will capture the command line intended for MAME and fire off the servostik EXE ONLY if it needs to switch from 4-8 way or vice versa (this means storing current state).  Then calling MAME and running it with the passed command line arguments.

I already had to write a custom one for Daphne command line as they differ from game to game.

My Setup is pretty unique.  I modified the servostik motors for Sanwa JLF and I built a narrower cabinet that wall mounts and the controls slide in and out as a drawer on 4 drawer rails (2 each side for extra support) and a motor to open/close it.  There is an arduino that runs the drawer open/close system on/off and I plan on getting info on how many buttons games need and only lighting those buttons with the arduino.  This same "Shim" application will trigger the number of lights to light for buttons or all if its unknown. 
« Last Edit: March 09, 2017, 02:49:39 pm by Flyer »

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Re: ServoStik Review
« Reply #20 on: December 21, 2017, 01:50:49 pm »
Don't often ressurect ancient threads, but this seems to be the best place for ServoStik users. On the software side of things, RocketLauncher (www.rlauncher.com), is a launcher application that replaces HyperLaunch for HyperSpin and is compatible with other frontends. I worked with them to add support for the ServoStiks. In a nutshell, RocketLauncher uses MAME data to automagically determine the correct mapping for your ServoStiks and then sets them to the correct mapping, as the game launches.

For non-MAME games, you can also program the mapping via manual settings per game -- IE Daphne.