[Techtoolslist] Kurz Kasch test fixture cards on eBay

[Andrew Welburn]

years ago i actually built a joystick interface for missile command with 
a couple of 555's . I found it was possible to simply pull the DIR input 
high or low to choose your direction and pulse the CLK input on each 
axis with a 555. This worked in u/d/l/r direction, but when you went 
diagonal, the cursor would shoot off in the opposite direction. Never 
quite figured out why, but i was cheating to make it work anyway so it 
was not a surprise it didn't entirely work.

It was crude, but it allowed me to usefully test missile command PCBs 
enough to fix them on my bench.

  These days i use a PIC microcontroller i programmed that properly 
translates a digital joystick input in to all types of trakball and 
spinner outputs. Different games count the controllers at different 
rates, so i've also got a pot that adjusts the speed of the output 
signals so that all games are playable (for adequate testing purposes 
only). Its all mounted into my testrig :)

Andrew Welburn
http://www.andys-arcade.com

On 18/02/2015 21:30, John Robertson wrote:
> On 02/18/2015 7:02 PM, Matthew Rossiter wrote:
>> I bought a set for Atari Tank only to find out I already have it. :)
>>
>> I notice Kurz Kasch never made a set of cards for Atari Basketball
>> AFAIK so I made a pretty nice little rig using a variac to control the
>> input voltage.   I just need to make a simple 555 timer - duty cycle
>> circuit like they have to mimic the trackball in other games so that I
>> don't have to hunt down a 4.5 inch trackball.  Anybody got a schematic
>> I can use?
>>
>> Matt
>>
> Don't you need two pulsing signals for each axis? Rotation and
> direction? How can you do that with a single 555 timer? Seems to me you
> would need a dual timer with an offset depending on which direction you
> want to 'go'.
>
> Or am I missing something?
>
> The Atari CTS-1 used a dual opto spinner for this sort of thing.
>
> John :-#)#
>>
>> On 2/18/2015 4:16 PM, John Robertson wrote:
>>> Coinopwarehouse has about 75 cards up for sale. I bought a few, and
>>> they are in good condition. Lloyd said most didn't come with
>>> documents, but he does include what he has. He will combine ship too.
>>>
>>> Worth looking at if you are rounding out your collection or want to
>>> trade with me sometime...
>>>
>>> stores.ebay.com/coinopwarehouse?_dmd=1&_nkw=kurz
>>>
>>> John :-#)#
>>>
>>
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>
>