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Re: Direct digital I/O ?

From rickman <gnuarm@gmail.com>
Newsgroups comp.sys.raspberry-pi
Subject Re: Direct digital I/O ?
Date 2016-06-13 14:25 -0400
Organization A noiseless patient Spider
Message-ID <njmtr1$g4$1@dont-email.me> (permalink)
References <njbs2a$96b$1@dont-email.me> <njmc5g$iip$1@dont-email.me> <MPG.31c8f48a6c0a39f5989801@172.16.0.1>

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On 6/13/2016 12:49 PM, Paul wrote:
> In article <njmc5g$iip$1@dont-email.me>, no.spam@thank.you.invalid
> says...
>>
>> "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> wrote in message
>> news:njbs2a$96b$1@dont-email.me...
>>> Inspired by Oscar Vermeulen's emulations of PDP8 and PDP11 front
>>> panels (I've used both processors, in my time over the past 40 years)
>>> but as yet inexperienced in the RPi world (despite getting Pi1 2
>>> years ago and Pi2 one year ago :-(  ),  I'd like to consider
>>> producing a similar front panel low-level access for the RPi itself.
>>> Is anyone aware of direct digital I/O facilities for the RPi, ie, in
>>> not going via the I2C bus?
>>> Or, even an I/O bus creation facility, perhaps much along the lines
>>> of the PDP8's Omnibus?
>>> Also, what of interfacing a hard disk into the SD card slot.?
>>> Apologies if I have posed these questions before, for it
>>> always takes me many months to come to a definite decision;
>>> never put off till tomorrow what you can put off till the day after :-)
>>
>> Interesting that the above has fomented a lot of negative thinking
>> and defeatism, and, for the moaners in those categories, yes, I
>> agree wholeheartedly, that it wouldn't work out for you.
>>
>> I had in mind a miniscult monitor program, with NMI being
>> driven from the ersatz Halt switch, and to use the built-in
>> debug instructions to perform single stepping.
>
> Forgot to say your
>
>>> Also, what of interfacing a hard disk into the SD card slot.?
>
> Is akin to connecting the water inlets of a washing machine to the
> gas mains. They operate differently and use different interfaces
> and different software drivers.
>
> Even on PDP-8's and similar they would have different interface cards
> just like serial interfaces, disk drives, printers etc on any system.

I see the guy is giving you a hard time.  He really is a troll and the 
best thing to do is to *totally* ignore him.  Don't respond even to tell 
him you are ignoring him.  I don't think that is going to happen in this 
group, but it would be for the best.

-- 

Rick C

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Thread

Direct digital I/O  ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-09 14:47 +0100
  Re: Direct digital I/O ? GlowingBlueMist <GlowingBlueMist@blackhole.io> - 2016-06-09 11:22 -0500
  Re: Direct digital I/O  ? "Dave Liquorice" <allsortsnotthisbit@howhill.com> - 2016-06-09 19:56 +0100
    Re: Direct digital I/O  ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-10 19:55 +0100
      Re: Direct digital I/O  ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-10 22:27 +0000
        Re: Direct digital I/O  ? mm0fmf <none@invalid.com> - 2016-06-11 07:45 +0100
          Re: Direct digital I/O  ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-11 08:37 +0000
            Re: Direct digital I/O ? The Natural Philosopher <tnp@invalid.invalid> - 2016-06-11 09:41 +0100
              Re: Direct digital I/O ? "Dave Liquorice" <allsortsnotthisbit@howhill.com> - 2016-06-11 11:17 +0100
                Re: Direct digital I/O ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-11 14:00 +0100
                Re: Direct digital I/O ? cb@elaine.df.lth.se (Christian Brunschen) - 2016-06-11 16:12 +0000
                Re: Direct digital I/O ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-12 22:00 +0100
                Re: Direct digital I/O ? cb@elaine.df.lth.se (Christian Brunschen) - 2016-06-12 22:40 +0000
                Re: Direct digital I/O ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-13 11:02 +0100
                Re: Direct digital I/O ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-12 22:04 +0100
              Re: Direct digital I/O ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-11 13:49 +0100
            Re: Direct digital I/O  ? Rob <nomail@example.com> - 2016-06-11 09:23 +0000
              Re: Direct digital I/O  ? Ahem A Rivet's Shot <steveo@eircom.net> - 2016-06-11 10:47 +0100
            Re: Direct digital I/O  ? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-06-11 12:46 -0400
              Re: Direct digital I/O  ? mm0fmf <none@invalid.com> - 2016-06-12 09:20 +0100
                Re: Direct digital I/O ? Michael J. Mahon <mjmahon@aol.com> - 2016-06-12 11:07 -0500
                Re: Direct digital I/O  ? andrew@cucumber.demon.co.uk (Andrew Gabriel) - 2016-06-12 16:13 +0000
                Re: Direct digital I/O  ? jeffj@panix.com (Jeff Jonas) - 2016-07-01 20:39 -0400
                Re: Direct digital I/O  ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-07-02 10:40 +0100
                Re: Direct digital I/O  ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-02 13:55 +0000
                Re: Direct digital I/O ? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2016-07-02 19:22 +0300
                Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-07-02 17:47 +0100
                Re: Direct digital I/O ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-07-02 17:07 +0000
                Re: Direct digital I/O ? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2016-07-02 21:30 +0300
                Re: Direct digital I/O ? The Natural Philosopher <tnp@invalid.invalid> - 2016-07-02 19:35 +0100
                Re: Direct digital I/O ? Dave Higton <dave@davehigton.me.uk> - 2016-07-02 19:43 +0100
                Re: Direct digital I/O ? The Natural Philosopher <tnp@invalid.invalid> - 2016-07-02 20:07 +0100
                Re: Direct digital I/O  ? andrew@cucumber.demon.co.uk (Andrew Gabriel) - 2016-07-03 18:59 +0000
                Re: Direct digital I/O  ? "Ivan D. Reid" <Ivan.Reid@ivan.fsnet.co.uk> - 2016-07-03 19:15 +0000
  Re: Direct digital I/O  ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-13 14:23 +0100
    Re: Direct digital I/O  ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-13 14:13 +0000
      Re: Direct digital I/O  ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-13 15:09 +0000
        Re: Direct digital I/O  ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-13 17:48 +0100
      Re: Direct digital I/O  ? mm0fmf <none@invalid.com> - 2016-06-13 17:45 +0100
        Re: Direct digital I/O  ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-13 17:04 +0000
          Re: Direct digital I/O  ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-13 19:13 +0100
      Re: Direct digital I/O  ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-13 17:47 +0100
    Re: Direct digital I/O  ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-13 17:49 +0100
      Re: Direct digital I/O  ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-13 19:07 +0100
      Re: Direct digital I/O ? rickman <gnuarm@gmail.com> - 2016-06-13 14:25 -0400
        Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-13 19:45 +0100
          Re: Direct digital I/O ? Jim H <invalid@invalid.invalid> - 2016-06-13 20:14 +0000
            Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-14 09:38 +0100
        Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-13 19:57 +0100
          Re: Direct digital I/O ? Mike Fleming <{mike}@tauzero.co.uk> - 2016-06-14 10:48 +0100
            Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-14 11:41 +0100
              Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-14 11:48 +0100
            Re: Direct digital I/O ? rickman <gnuarm@gmail.com> - 2016-06-14 20:24 -0400
              Re: Direct digital I/O ? The Natural Philosopher <tnp@invalid.invalid> - 2016-06-15 08:13 +0100
                Re: Direct digital I/O ? rickman <gnuarm@gmail.com> - 2016-06-15 03:26 -0400
                Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-15 08:54 +0100
                Re: Direct digital I/O ? AndyW <Andy@nojunqmail.com> - 2016-06-15 16:48 +0100
                Re: Direct digital I/O ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-15 21:02 +0000
                Re: Direct digital I/O ? Martin Gregorie <martin@address-in-sig.invalid> - 2016-06-15 11:21 +0000
                Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-15 16:21 +0100
              Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-15 08:52 +0100
              Re: Direct digital I/O ? Gordon Levi <gordon@address.invalid> - 2016-06-15 18:57 +1000
                Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-15 10:28 +0100
                Re: Direct digital I/O ? rickman <gnuarm@gmail.com> - 2016-06-15 10:57 -0400
                Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-15 16:23 +0100
                Re: Direct digital I/O ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-15 16:46 +0100
                Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-15 17:04 +0100
                Re: Direct digital I/O ? Rob Morley <nospam@ntlworld.com> - 2016-06-15 17:43 +0100
                Re: Direct digital I/O ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-15 20:57 +0100
    Re: Direct digital I/O  ? Paul <paul@pcserviceselectronics.co.uk> - 2016-06-13 17:46 +0100
      Re: Direct digital I/O  ? "gareth G4SDW GQRP #3339" <no.spam@thank.you.invalid> - 2016-06-13 19:06 +0100

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