Hi Andy, Do you have any documentation on your PIC micro controller setup? That would sure be handy as I have about 4 Atari Basketball boardsets that I need to get working. Well, actually I have 1 down, 3 to go. thanks! Matt On 2/19/2015 9:24 AM, Andrew Welburn wrote:
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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