Amstrad GX-4000 controllers - any damage possible?

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barnieg
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Amstrad GX-4000 controllers - any damage possible?

Postby barnieg » Tue Aug 09, 2016 9:07 am

I have an Amstrad GX-4000 console with 2 controllers as they are Atari 9 pin style they would plug into the mist. However I know in the real world it is possible to cause damage by plugging the wrong controller in once you get passed the standard 1 fire button.

How does Mist treat one of these controllers? Would I get 2 fire buttons with the Amstrad Core? What about other cores?

I could just try them but don't want to damage the board

Note: A similar question applys to other legacy controllers: how are Megadrive or Master System controllers treated? Is it all dependent on indivdual cores?

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Newsdee
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Re: Amstrad GX-4000 controllers - any damage possible?

Postby Newsdee » Tue Aug 09, 2016 10:31 pm

it's not dependent by core. Joysticks get processed by the firmware and are translated to a byte state passed to the FPGA (this allows catering for USB as well).

Genesis/Megadrive controllers work fine except only one button is recognized (B), same as if you used them with an Atari VCS.

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Re: Amstrad GX-4000 controllers - any damage possible?

Postby Newsdee » Tue Aug 09, 2016 10:44 pm

Looking at MiST schematics (see wiki) Fire1 on the Gx4000 is connected to the MiST Pin7 which is 5V. I don't know if it can damage the board but to be safe you could wire a small adapter that disconnects pin7. Fire2 will then work as the Atari button already.

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Re: Amstrad GX-4000 controllers - any damage possible?

Postby DrOG » Wed Aug 10, 2016 9:56 am

I found a chart here:

http://wiki.icomp.de/wiki/DB9-Joystick

The MIST board V1.3 schematic shows that there's a second button option on the 9th pin of D-SUB connector. I don't know if the current firmware handles it or not as second fire. Perhaps rewiring the controller's first button from pin 7 to 9 will add an opportunity to use it?

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Re: Amstrad GX-4000 controllers - any damage possible?

Postby Newsdee » Wed Aug 10, 2016 2:29 pm

That should work, there can be up to two buttons using the Amiga pinout. The key part is to not connect anything to the pin 7 of the MiST DB9 connector as it has 5V (unless you do need it for something)

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Re: Amstrad GX-4000 controllers - any damage possible?

Postby DrOG » Thu Aug 11, 2016 5:09 am

Hi all!

I found an article in the 'Amiga Mania' (hungarian Amiga-related newspaper) #6 about rewiring a Sega Megadrive gamepad to Amiga machines:

http://amigamania.amigaspirit.hu/Amiga% ... OnLine.pdf

It's on page 17 (in pdf 19). As I see, the DB9 pinout of the Amiga and the MiST are the same (obviously for compatibility reasons), and since the article is in hungarian language, the charts and pictures make it clear.

And a short overall review about MiST from Nr.9., on page 16-17. (pdf 18-19.) (It's not up-to-date, was written more than a year ago):

http://amigamania.amigaspirit.hu/Amiga% ... OnLine.pdf

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Re: Amstrad GX-4000 controllers - any damage possible?

Postby barnieg » Thu Aug 11, 2016 10:03 pm

http://wiki.icomp.de/wiki/DB9-Joystick is useful. I'm going to wire up some cables to see to see if I can use them as 2 button pads. Depending on spare parts I will post when I have some feedback and hopefully haven't damaged the MiST :)

Thanks all for the input!

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Re: Amstrad GX-4000 controllers - any damage possible?

Postby lips2k15 » Wed Mar 22, 2017 5:24 pm

Did you have any luck with this?

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Re: Amstrad GX-4000 controllers - any damage possible?

Postby barnieg » Thu Mar 23, 2017 1:04 am

lips2k15 wrote:Did you have any luck with this?


Sadly not yet, nasty seperation means I got as far as checking schematics and necessary parts then ended up homeless most of my retro stuff is in storage including all my Atari stuff and MiST hopefully within the next month I can get hold of the Mist and GX-4000 controllers.

Barnie

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Re: Amstrad GX-4000 controllers - any damage possible?

Postby DanyPPC » Thu Mar 23, 2017 6:44 am

Pinout of GX4000 controller is not suitable to DB9 ports of MIST.
Only CD32 joypads are compatible with MIST and Chameleon 64, and these work as a 2 button controller with the Amstrad CPC games that support GX4000 controllers.

Alternatively you can use a standard USB gamepad.

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Re: Amstrad GX-4000 controllers - any damage possible?

Postby barnieg » Mon Mar 27, 2017 12:17 am

DanyPPC wrote:Pinout of GX4000 controller is not suitable to DB9 ports of MIST.
Only CD32 joypads are compatible with MIST and Chameleon 64, and these work as a 2 button controller with the Amstrad CPC games that support GX4000 controllers.

Alternatively you can use a standard USB gamepad.


Thats why an adapter cable or rewire is required but yes wouldnt be a good idea to plug straight in. However they do still follow the 1 button atari standard. Its just a shame that no one standardised following additions to allow more buttons etc


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