Joystick pinouts for BBC Micro, Help

[billysastard]

hi i recently purchased an amstrad aj-5 analog joystick (uses a 15 pin gameport for old pc's or amstrad gx4000/cpc+) and a quickshot pc analog stick and want to use them on my bbc b+ but i couldn't find anyone selling an adapter anymore, i know it's supposed to be a fairly simple job so i asked someone i've dealt with before (he makes all sorts of stuff commercially for the amiga) if he could build me one (i'm afraid no matter how easy, i couldn't do it now), he replied as follows.....

 

"There is a lot of info online for the BBC and acorn analogue port, but not one of the documents I have found tells you which is the pin for the x axis pot, and which is the pin for the y-axis pot.

All you get is:

Joy1 ch0 = pin 15
Joy1 ch1 = pin 7
Joy2 ch2 = pin 12
Joy2 ch3 = pin 4

So it would be a 50-50 gamble guessing which two pins were for the x axis and which two pins were for the y-axis."

 

 

 

is there anyone here who could help me out with the correct pinouts to make either a 1 or 2 port 15 pin adapter?

 

thanks in advance.

 

[carlsson]

Here is one (of several) diagrams on building an Atari to BBC joystick. Based on the schematic, it looks like pin 7 (joy 1) and pin 4 (joy 2) correspond to up/down while pin 15 (joy 1) and pin 12 (joy 12) equal left/right.

 

http://zxjim.blogspot.co.uk/2012/05/acorn-bbc-atari-joystick-adapter.html

 

Thus if you want to use digital Atari style joysticks, you could have your friend build along that diagram. If he wants to doublecheck, there was some discussion and links to other designs here:

http://www.stardot.org.uk/forums/viewtopic.php?f=3&t=2894

[billysastard]

Here is one (of several) diagrams on building an Atari to BBC joystick. Based on the schematic, it looks like pin 7 (joy 1) and pin 4 (joy 2) correspond to up/down while pin 15 (joy 1) and pin 12 (joy 12) equal left/right.

 

http://zxjim.blogspot.co.uk/2012/05/acorn-bbc-atari-joystick-adapter.html

 

Thus if you want to use digital Atari style joysticks, you could have your friend build along that diagram. If he wants to doublecheck, there was some discussion and links to other designs here:

http://www.stardot.org.uk/forums/viewtopic.php?f=3&t=2894

thank you so much, i've passed the details on