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Ask an Expert Forum Looking for way to switch 8 pins at once, either mechanically or low-powered electronics
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Looking for way to switch 8 pins at once, either mechanically or low-powered electronics

Former Member
Former Member over 10 years ago

Hi!

 

I'm building a mouse/joystick switch for use with old Atari/Amiga 16-bit computers. On these computers, joystick port 0 double as a mouse port, so if you want to play two-player games you have to swap the mouse for a joystick, which is a hassle (especially so on the Atari ST, where the port is underneath the machine). So a little box where you'd connect both mouse and joystick and switch to choose one of them would be helpful.

 

What I need is a way to switch 8 of the pins at once, either using a DPDT-style switch or something like a couple of 4066's.

 

However, the 4066's need power (of which I can draw only miniscule amounts from the port's 5V pin), and I simply can't find any suitable 8-pole mechanical switchers, probably because I'm not using the right search words.

 

A latching push button would be a nice mechanical solution, but even better would be a switch where it'd be immediately obvious which device is active, like a slider or a toggle switch.

 

 

Thanks in advance,

 

Per.

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Top Replies

  • Jan Cumps
    Jan Cumps over 10 years ago +1 suggested
    Hey, this is the first time that I can recommend the same IC in two different questions: SN74CBT16245DGGR: 16-Bit FET Bus that can switch two groups of 8 pins. Very fast. (I also recommended it for another…
  • Former Member
    Former Member over 10 years ago in reply to Jan Cumps +1
    Thanks for the reply! That little guy (well, IC...) looks great, but I'm honestly not sure my soldering skills are up to it. But no, I didn't mention my beginner status, so how could you have known? But…
  • Robert Peter Oakes
    Robert Peter Oakes over 10 years ago in reply to jw0752 +1
    Wow, I would never have expected that, but I would not be so sure about the eBay specials
Parents
  • jw0752
    0 jw0752 over 10 years ago

    Hi Per,

    Here is a switch that can switch 25 lines to position A or B. I used to use switches like this for multiple printers on one computer. You will not need 25 lines but it would be relatively easy to tap into 8 of them.

     

    http://www.ebay.com/itm/2way-DB25-pin-wire-AB-Manual-Data-Switch-Box-Parallel-Printer-LPT-Device-SHdis-T-/121694397454?hash=item1c558d240e

     

    John

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  • jw0752
    0 jw0752 over 10 years ago

    Hi Per,

    Here is a switch that can switch 25 lines to position A or B. I used to use switches like this for multiple printers on one computer. You will not need 25 lines but it would be relatively easy to tap into 8 of them.

     

    http://www.ebay.com/itm/2way-DB25-pin-wire-AB-Manual-Data-Switch-Box-Parallel-Printer-LPT-Device-SHdis-T-/121694397454?hash=item1c558d240e

     

    John

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  • Robert Peter Oakes
    0 Robert Peter Oakes over 10 years ago in reply to jw0752

    It may not be switching all 25 lines so beware, Centronics printers have alot of grounds so many may be common to both sides and only the 8 data and a few handshake will be switched, but even this is enough to meet the askers requirements

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  • jw0752
    0 jw0752 over 10 years ago in reply to Robert Peter Oakes

    Hi Peter,

    I have a couple of DB 25 4 throw switches and I cracked one open to see if there was a problem with grounds not being switched. At least in the case of this one all 25 lines are switched. Obviously a 2 throw switch would not be as much of a rats nest as my 4 throw.

     

    image

     

    image

     

    John

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  • Robert Peter Oakes
    0 Robert Peter Oakes over 10 years ago in reply to jw0752

    Wow, I would never have expected that, but I would not be so sure about the eBay specials

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