yah, that's exactly what you'd want to do - set up serial comms on that sort of hardware hack.
you don't need flow control for TPDD protocol.. it is self limiting since it is hand-shaking for every "packet" and each packet is small enough to be managed by the tiny M100 buffer. Steve On Tue, Jan 5, 2016 at 9:59 AM, VANDEN BOSSCHE JAN < jan.vandenboss...@vivaqua.be> wrote: > > But, you certainly can't plug the TTL signal into the M100. > > > > Bummer. It's never simple enough. Or … > > > > > So, to adapt the M100 to a TTL signal , you need to clamp at 0V/5V, and > invert. > > > > Can't that be done ? > > > > Anyway, I'll probably need something linke this ? > http://pi4j.com/example/serial.html > > > > Actually, that expands the possibilities. I could use a Model A, and have > one USB-port to spare. > > > > Can LaddieAlpha be customised to write the files to a USB-flashdrive ? > That way, you turn the R.Pi off, and remove the USB-stick for file transfer. > > > > > > * |\ _,,,--,,_* > > * / ,`.-'`' ._ \-;;,* > > * |,4- ) )_ .;.( `'-'* > > *<---''(_/._)--'(_\_)* > > *Jan Vanden Bossche @ work* > > > > > > > > > > *From:* M100 [mailto:m100-boun...@lists.bitchin100.com] *On Behalf Of *Stephen > Adolph > *Sent:* dinsdag 5 januari 2016 15:48 > > *To:* Model 100 Discussion > *Subject:* Re: [M100] Raspberry Pi as TPDD > > > > Hi Jan, > > the M100 RS-232 port is not a TTL port, it is kind-of a low voltage > hybrid. It doesn't provide true full swing RS-232. > > * M100 is inverted like standard RS-232 > > * the "high" voltage level is >> 5V > > * the "low" voltage is negative, but not by much. close to 0V. > > (by memory-- I'll have to have a schematic in front of me to confirm > this....) > > A normal RS-232 signal is balanced, meaning it has a full swing ex. > +10V/-10V. > > So, to adapt the M100 to a TTL signal , you need to clamp at 0V/5V, and > invert. > > But, you certainly can't plug the TTL signal into the M100. > > ..Steve > > > > On Tue, Jan 5, 2016 at 9:40 AM, VANDEN BOSSCHE JAN < > jan.vandenboss...@vivaqua.be> wrote: > > John, > > > > > The pi already has a serial port it's just at TTL levels instead of rs232 > > > > Wasn't one of the criticisms of the Model T that its serial port was > TTL-level (i.e. max 5 Volt) too ? > > If that is correct - and please do correct me if I'm wrong - then what's > the problem ? > > > > *|\ _,,,--,,_* > > * / ,`.-'`' ._ \-;;,* > > * |,4- ) )_ .;.( `'-'* > > *<---''(_/._)--'(_\_)* > > *Jan Vanden Bossche @ work* > > > > > > > > > > *From:* M100 [mailto:m100-boun...@lists.bitchin100.com] *On Behalf Of *John > R. Hogerhuis > *Sent:* zaterdag 2 januari 2016 16:53 > *To:* Model 100 Discussion > *Subject:* Re: [M100] Raspberry Pi as TPDD > > > > Usually the first adapter shows up as /dev/ttyUSB0 > > > > If you have multiple you can have issues with which adapter is which > name. There's a way to create udev rules so the same name is always bound > to the same device. > > > > Power cycles: I suggest getting ups pico board or just always keeping it > plugged in to something, could be a battery. > > > > As to the board: not really smaller no. The pi already has a serial port > it's just at TTL levels instead of rs232. The board I've used is just a > max232 chip to do the level conversion. I guess if you built the chip into > the cable it could be smaller. Otherwise you're adding a daughter board. I > prefer the USB serial devices unless you're out if USB ports. > > > > -- John. > > On Saturday, January 2, 2016, Jan-80 <ja...@scarlet.be> wrote: > > Hi, > > 2. LaddieAlpha on Mono were the the names I was looking for. If it works, > I don't care about name or environment. I was just pondering aternatives. > > 4. /dev/ttyS0 is the first USB-port, then? Or is it the USB-port + a > USB-2-serial adapter? > > 6. How do you manage power cycles? > > 5. If you build your own serial port, isn't that smaller? > > -- Greetings from the TyRannoSaurus Jan-80 > > > > On Fri, 1 Jan 2016 17:22:11 -0500, Stephen Adolph wrote: > > HI Jan, > > I am currently running a raspberry pi with laddieAlpha, and it is working > well. > > Why do you want to use Desklink? > > In my case, Laddiealpha is listening to a TCP port however, not serial. > > Certainly it could use the /dev/ttyS0 port if you wanted to. > > John H is the expert here. > > ..Steve > > > > On Fri, Jan 1, 2016 at 10:46 AM, Jan-80 <ja...@scarlet.be> wrote: > > Hello, > > A happy New Year 2016 to all of you. > > I would like to use my old Raspberry Pi - an early Model B with only 256 > MB RAM - as a TPDD replacement. It would also allow anyone with any type of > old Raspberry Pi to do so. I am sure that, with the presentation of the > Pi2, a lot of hobbyists are going to sell their first-generation Pi's and > they can be picked up really cheap. > > Software: there have been 2 ways reported on this list on getting a TPDD > emulator to work on the R.Pi. A third one was never mentioned, but might be > possible also. Correct me if I'm wrong > 1. re-compiling Desklink from the original source for the Raspbian > environment. > 2. running the Windows.NET based version of Desklink in the > .NET-compatible environment of the R.Pi. (sorry, forgot the name) > 3. is it possible to run a Desklink in DOS-emulated environment? (Just an > idea of mine...) > > Hardware: come to think of it, some hardware stuff must also be considered. > 4. Serial link simple: a USB-to-serial adapter does the trick. I have one, > but don't know if it will work. How do I test this? > 5. Isn't it possible to use the I/O pins from the R.Pi as a serial port? > Does the TPDD need the control lines? > 6. If you use the R.Pi as a TPDD, you're likely to turn it off an on as > one. But the R.Pi is a computer, and you could ruin the filesystem by doing > so. Isn't it better to use a hardware on/off button instead of simply > pulling the plug? Like this one: > > http://www.raspberry-pi-geek.com/Archive/2013/01/Adding-an-On-Off-switch-to-your-Raspberry-Pi > > > > > Rejoignez-nous sur Facebook - Volg ons op Facebook > > > DISCLAIMER > > Pensez à l'environnement, n'imprimez cette page et ses annexes que si > c'est nécessaire. > > Ce message électronique, y compris ses annexes, est confidentiel et > réservé à l’attention de son destinataire. > Si vous n'êtes pas le destinataire de ce message, merci de le détruire et > d’en informer l’expéditeur. 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