Re: TI-H: Joystick connector

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Re: TI-H: Joystick connector


I can do it in 5 wires!!! Wire 1 is common. It connects to pin 24 on the 
microprocessor (for the TI-85 anyway). left is pin 17, right is pin 18, 
up is pin 19, and down is pin 16. simply connect the 4 buttons in the 
joystick to each wire, with common (pin 24) connecting to all the 
buttons in the joystick. 5 wires is all that's needed. add pin 21 and 30  
to the fire button to press 2nd. that's 7 wires. add 1 more wire, pin 
22, and short it with pin 30 to get exit. That's 8 wires (8 pin header 
WILL fit on a TI-8x. Pin 23 and 29 is Alpha. If you have the arrow keys, 
and 2nd and alpha, you use 5 wires for the arrow keys and 4 for the two 
fire buttons (2nd and Alpha). That's 9 pins! If you have a third button, 
add 1 pin for exit and you have 10 pins (use a 10 pin header)! You can 
have 2nd, Alpha, EXIT, and the 4 arrow keys all on one joystick, enough 
to control most shells even!!! The design can be modified for any calc 
as well!!!

Personaly though, I'd rather see a positional joystick. Maybe a GUI that 
uses it as a mouse. Something small, about the size of an N64 Analog 
joystick, and would work the same way! That's what I want, because I 
personaly agree that just emulating the keys is boring.

Richard Piotter
richfiles1@hotmail.com

>
>
>It wouldn't really matter whether it was a 9 or 15 pin, but mine is a
>15-pin.  I found a joystick that I'm going to use, it is a SMALL 1in. X 
1in.
>X 2 in.!  Basically,  whenever the joystick is moved, a relay is pulled 
and
>then any key (whichever you solder the relay to) is pressed.  Pretty 
simple.
>Since joysticks have a calibration knob, this idea will work.  As for a
>gamepad. . .  You would need a special port just for it.  You would 
have to
>double the wires going to the gamepad, because they will have to 
diectly
>short the keys.  I will have plans soon for a port that can be used by 
both,
>with a modification to the gamepad.  Since a 15-pin port would be hard 
to
>put on a TI-86 (or any other calc) and getting the cover to fit, I am 
going
>to use a small phone (or any other) port that will fit, but I will have 
to
>make an adapter.  I'm working on an interface for the link port, but I
>haven't gotten that far, and I don't know if there are enough people 
who
>would want that.  If you have any suggestions or comments, e-mail me at
>reb@netride.com or, just reply to this message.
>
>
>                                                                            
>-Robert Brack
>
>-----Original Message-----
>From: Osma Suominen <ozone@clinet.fi>
>To: ti-hardware@lists.ticalc.org <ti-hardware@lists.ticalc.org>
>Date: Thursday, February 12, 1998 10:49 AM
>Subject: Re: TI-H: Joystick connector
>
>
>>
>>Robert Brack wrote:
>>
>>> I got a huge brainstorm in the middle of band the other day.  Since 
we
>weren't
>>> playing, I got out a pad and started scribbling out an experimental
>schematic.
>>> This is still preliminary, but I figured out a way to interface a
>joystick to
>>> my calc (gamepads will be done a little differently).  The first 
thing I
>did
>>> when I got home was pull apart my joystick and use my DMM to measure
>voltage on
>>> everything.  I then fixed my schematic.  I haven't built it yet, but 
I'd
>like
>>> some feed-back.  This should work with and game currently out.  I 
will be
>>> posting a finished schematic at ticalc.org within two weeks.  Tell 
me
>what you
>>> think.
>>
>>Some time ago, I thought about interfacing a joystick to the calc with 
an
>>I2C system. A digital (Amiga, Atari, C64 style) joystick would be 
connected
>>to the PCF8574 I/O expander, which in turn would be connected to the 
link
>>port or SPinTerface port. The rest would just require some 
programming.
>>
>>I thought about an interrupt driven system where an interrupt routine 
polls
>>the joystick port constantly, and hands over this information to the
>>application. It might even be possible to make the joystick movements 
look
>>like keypresses to the running game, but this is unlikely because I 
assume
>>most games read the keypad directly and not via ROM calls. Making 
those
>>games work with the joystick would require tinkering with the 
internals of
>>the TI.
>>
>>Of course, the system would also work fine without even using 
interrupts. A
>>game could have direct joystick support, and poll the interface chip
>>whenever it wants. The programming should be a piece of cake with my 
MBus
>>routines, and the hardware isn't difficult to do either. I just don't 
know
>>if there's real need for a big clumsy joystick to be connected to a 
small
>>and handy calculator, but there are some people who will want it 
anyway.
>>
>>How have you dreamt up the hardware part? Does your system connect to
>>analog (PC,15pin) or digital(9pin) joysticks? The TI community ain't 
big
>>enough for both of the systems, but if you want, you can do all the 
stuff
>>yourself and I won't start making a rival system. I'm too busy even 
without
>>the extra work.
>>
>>-Ozone
>>
>>--
>>*** Osma Suominen *** ozone@clinet.fi *** http://www.clinet.fi/~ozone 
***
>>
>>
>
>


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