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7174Re: [cosmacelf] Re: Membership card Rev. B

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  • Chuck Bigham
    Oct 22, 2010
      Is there a way to signal external hardware when data is available at the output port? Other systems I've used have TPB brought out to signal that data was available, but it doesn't look like TPB is available on the front panel connector. Does anyone have ideas how external hardware can be signaled?

      Worst case, I can greenwire TPB to a pin on the 30-pin connector, but I was hoping someone might have a more elegant solution that I'm not seeing.


      From: Lee Hart
      Sent: Monday, October 11, 2010 6:43 PM
      To: cosmacelf@yahoogroups.com
      Subject: Re: [cosmacelf] Re: Membership card Rev. B

      On 10/11/2010 12:51 PM, timgreenowb wrote:
      > The main thing is you can keep your program without having to pull
      > the I/O board off when you power down.

      You don't have to remove the Front Panel board to go into standby
      (minimal power consumption). Power connector P4 has 4 pins:

      pin 1 = positive supply (3-6v)
      pin 2 = Standby/Run; tie to pin 1 to run, leave it open for standby
      pin 3 = LEDs; tie to pin 4 to enable LEDs, leave it open to disable
      pin 4 = negative supply (3-6v)

      So, for minimum standby power, open the connections between 1-2 and 3-4
      with a switch.

      Or, note that 1v is enough to maintain memory contents, but stops the
      clock and other logic from drawing power.
      Lee A. Hart | Ring the bells that still can ring
      814 8th Ave N | Forget the perfect offering
      Sartell MN 56377 | There is a crack in everything
      leeahart earthlink.net | That's how the light gets in -- Leonard Cohen

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