Hello,
I had the dlplus.zip lying around for a long time, but I see that it is at
the bitchin100.com web site (DLPlus for Linux etc.).
I'll try and do some proper documentation for this and a web page but the
short version (from memory) is....
The Sparkfun converter seems to let the M100 talk to the pi but it can't
convert the ttl signal to RS232. I gave up on that one...
The converter I have with the Max232 works OK and I have the pdf for it
but the web address on the pdf (www.anykits.com) doesn't work anymore. I
thought I bought it from electrokit.com in Sweden but they don't seem to
list it now, either. Googling Raspberry Pi and Max232 gives a lot of
results that look promising. Some look like they plug right into the GPIO
connector.
There are only 4 wires connecting the pi (GPIO connecter) to my level
converter. I used an old CD-ROM audio cable and moved some pins around.
You need tx,rx,gnd, and 5v. The level converter gets its power from the
pi. No hardware handshaking.
I tested it both with arch and raspbian but raspbian had a C compiler etc.
so I stuck with it (Jessie). You need to configure Raspbian to start in
command line mode, and while you're at it, edit the file in cmdline.txt
(in boot) so that the baud rate after ttyAMA0 is 9600 (default is 115200).
With a null modem between the level converter and the m100, it should work
at 9600 baud. Xon/xoff seems to be the default for ttyAMA0.
Unzip dlplus.zip somewhere and type make. I don't think I changed
anything in the source. dl seems to set the baud rate for the transfer to
19200 (I can see it in the source) so I've set TINY to 19200 for
transfers. I've been meaning to change everything to 9600 but I haven't
gotten around to it.
Jonathan
On Thu, 22 Oct 2015, VANDEN BOSSCHE JAN wrote:
THIS ...
http://arstechnica.com/information-technology/2015/08/surfing-the-internet-from-my-trs-80-model-100/
... is what I'm going to use the Raspberry Pi I've got lying around in my house
for.
And I'm very interested in DL for the Raspberry Pi. I think you should describe
how you did this, how you use it, and publish it somewhere on the 'net. And for
reference, send it to Bitchin'100... ;-)
Greetings from the TyRannoSaurus
Jan-80 """""
@ work ( @ @ )
--------------.ooo--(_)--ooo.---
Be green, read from the screen!
From: M100 [mailto:m100-boun...@lists.bitchin100.com] On Behalf Of Mark Wickens
Sent: donderdag 22 oktober 2015 09:53
To: Model 100 Discussion
Subject: Re: [M100] An article about the TRS 80 Model 100
I'm not sure why 9600 baud is such a magic number but I've had *so* many
devices now that won't talk sensibly above that speed, even modern kit.
I have a model 200 that I would like to get round to modernising, but there are
too many projects in my head and not enough time!
Regards, Mark
On 22 October 2015 at 08:11, <jonathan.y...@mykopat.slu.se> wrote:
Hello,
It was that article that got me to dig out my M100 and a 'spare' raspberry pi
(a B+) I had sitting around. I had played with the m100 and the first pi I had
but that project fell by the wayside. I connect in a slightly different way
since I had been connecting the pi to my other machines via the GPIO bus and a
USB to serial adapter. So (to me) it seemed logical to try the M100 and the
GPIO bus.
This meant using a level shifter (the pi is 0/3.3 v, I think) and RS-232 is
-12/+12. I found a couple of pi sites that talked about the MAX232 chip, and I
built a little adapter using this chip from a kit.
The pi and the M100 work fairly well together. There is no hardware
handshaking, but at least raspbian and a recent version of arch both had
xon/xoff handshaking as default on /dev/ttyAMA0 (the GPIO bus serial port). At
19200 baud things still got garbled but 9600 is just fine. I made my own null
modem with some db9 and db25 connectors and a soldering iron.
I even compiled dl (the linux version of desklink) and I can use the pi as a
mass storage device. I still haven't figured out how to end the dl program
from the M100, but the pi is fairly robust and with another pi (my 3g
modem/wifi hotspot) we just unplug it when we want to turn it off. I could
probably also use a timer to automatically end dl after a fixed time but I
haven't gotten around to trying this.
Jonathan
On Wed, 21 Oct 2015, Duane Calvill wrote:
While browsing the internet. I was found this article. Just wanted to pass
it on to other to read.
http://arstechnica.com/information-technology/2015/07/back-to-the-future-the-trs-80-model-100/
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