Caple C871i Manual do Utilizador descarregar pdf (Página 341)

Apple II Computer Info

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frankc writes ...

> Okay, I have looked at what it takes to convert a PC joystick

> to an Apple II joystick. I have found it to be suprisingly

> simple. I have seen some web sites that discuss using

> capacitors, resistors, etc... The problem is some of these

> tend to lose functionality if you do this. So I pulled apart

> a joystick that has both a PC connector and an Apple II (9

> pin) connector and found that the only thing that is being

> converted is the digital side, the buttons. The

> potentiometer is being fed 5 volts on one side and fed to the

> Apple and PC input pins. So I came up with a simple circuit

> that RETAINS THE RAPID FIRE functionality of some joysticks.

> I have built a schematic and have made it into a GIF file. I

> tried to upload it here, but the message never showed up.

The net seems to be messing up here and there recently. Your posting

with the diagram came in okay on my server; thanks for posting it. Your

diagram is reproduced below. (I added more line colors to help see what's

going on.)

> So if anyone wants it they can have it if they mail me

> directly. I have not tested it just yet so be warned it may

> not be %100 percent. I will not take resposibility for you

> torching your computers! Anyway, it should work fine.

....

It looks like your design should be fairly torch free. It will not work

properly as-is because the standard PC joystick's pots max out around 100k

Ohms, 50k less than the pots on Apple II joysticks.

Adding a small capacitor (approx. 0.01uF) on each paddle lead going to

Ground should compensate for the difference in max resistances.

Using a logic IC to invert Button/RapidFire signals is an interesting

approach. (The design for doing this referenced on the FAQs KB&Joystick page

uses PNP transistors.) Since there is about six feet of wire connected to

each gate input on the IC, you may need to add pull-up resistors-- about 3.3k

going to +5V-- on each input to avoid false triggering due to noise.

Rubywand

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Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 341 of 572

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Caple C871i Manual do Utilizador Página 341

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