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/
