[Oberon] Emulating an RS-232 line with the Oberon emulator

Peter De Wachter pdewacht at gmail.com
Tue Oct 24 22:17:38 CEST 2017

This is now possible with my emulator, https://github.com/pdewacht/oberon
You can set it up like this:

mkfifo pipe1 pipe2
risc --serial-in pipe1 --serial-out pipe2 ob1.dsk &
risc --serial-in pipe2 --serial-out pipe1 ob2.dsk &

This works on Linux, I'm not sure how portable the code is.

Some notes:
* If you use this feature, the built-in PCLink1 handling is disabled.
* Don't use the same disk image for multiple instances of the emulator.
* You can use /dev/fd/n if you want to connect to a file descriptor
instead of a file
* Transfer speed might be rather poor, as the emulator pauses when it
detects that Oberon is busy-waiting on I/O.

On Tue, Oct 24, 2017 at 8:08 PM, Andreas Pirklbauer
<andreas_pirklbauer at yahoo.com> wrote:
> Does anyone know how one can link TWO emulated Oberon instances? The idea
> would be to start two Oberon instances with the Oberon emulator on a host
> system (e.g., Mac, Linux, Windows) and then “link” them with a mechanism
> that e.g. behaves like an RS-232 line:
> "Oberon instance A”  <--->   “Link that emulates an RS-232 link”   <—-->
> “Oberon instance B”
> From the source code of the Oberon emulator at  www.github.com/charlesap/io
> I see that the two file transfer commands “pcsend.sh" and “pcreceive.sh" are
> realized via a file interface (the files PCLink.REC and PCLink.SND are
> written by these two commands, and the emulator then reads from or writes to
> them if the program PCLink1 running inside the emulator reads from or writes
> to the memory addresses -56 and -52, i.e. the addresses which map the RS-232
> line, see RS232.Mod).
> So it *should* be possible to extend this mechanism such that the two ends
> are permanently “connected" together. On Mac or Linux, the pipe mechanism
> might be used to accomplish this.
> -AP
> --
> Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
> https://lists.inf.ethz.ch/mailman/listinfo/oberon

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