[Simh] Physical serial ports and SIMH

[Brian Knittel]

Hi Gregg,

This is an interest of mine too, for some personal and some work 
projects.

The RPi usees 3.3V logic, so you have to use a level-shifting chip to 
use the hardware UARTs with RS-232 or RS-4xx. I've had an RS-232/RPi 
interface sitting on the dining room table half put-together for the 
last 2 months, so I can't tell you yet how well it works.

Re: the USB to RS-232 interface options (most of which, AFAIK, use the 
FTDI chip built into a cable), I have read online accounts of 
instability in the Raspbian drivers -- the interfaces work for a few 
minutes or hours, and then stop working. If true, that makes them 
functionally worthless.

I'd be very interested to hear if anyone has had this experience, or 
has found a USB/RS-232 cable/driver combo that has proven to be stable 
on the RPi.

Brian


On 26 Jun 2013 at 11:01, Gregg Levine wrote:

Hello!
Right now I am tooling up to try out an idea or two concerning the
PDP-11 emulation. This is to be run on a Raspberry Pi running the
latest release of their Raspberry specific Debian release. (Also fully
updated and upgraded.)

The device has the two USB connections ostensibly for a keyboard and
mouse, but one gentleman I know managed to make use of the serial port
function on one of them, and attached a USB to serial adapter to one
of the connections. So obviously I can connect two adapters to the two
ports there.

But what about the serial port embedded on the GPIO connectors? Can I
make use of that one?

I know normally that SIMH emulates a chosen computer and only fairly
recently with some of them do communicate with the outside world via
Ethernet, but for what I'm planning and working on, it seems to be a
good fit. Should it work I might be able to upscale the working
programs to Mr Wilson's product running on an X86 board instead, or
even an actual PDP-11 model.....
-----
Gregg C Levine gregg.drwho8 at gmail.com
"This signature fought the Time Wars, time and again."
_______________________________________________
Simh mailing list
Simh at trailing-edge.com
http://mailman.trailing-edge.com/mailman/listinfo/simh=-=-=-=-=-=-=-=-=
-=-=-=-=-=-=-=-=-=-=-
_| _| _|  Brian Knittel
_| _| _|  Quarterbyte Systems, Inc.
_| _| _|  Tel: 1-510-559-7930
_| _| _|  http://www.quarterbyte.com