[Simh] PDP10: KS10 console lights?

[Clem Cole]

On Fri, Sep 7, 2018 at 1:52 AM Lars Brinkhoff <lars at nocrew.org> wrote:

> Timothe Litt wrote:
> > > I have checked the KS10 instruction set.  It doesn't have a DATAO
> > > PI, instruction.  However that particular opcode isn't in used, so
> > > it's just a UUO.  This is also the case for ITS microcode.  Before I
> > > start working on anything, I'd like to ask if it would be OK to
> > > repurpose this opcode for its traditional use?
> >
> > Neither the KL nor the KS use DATAO PI,. I don't have a problem with
> > implementing it for the KS. It would need to act like any IO
> > instruction - MUUO in user mode, functional in Exec and with
> > User-In-Out.
>
> Of course.
>
> The next problem is, how to access USB from SIMH?  I have something that
> works in Linux.  I checked SIMH to see if there's a built in USB API
> that works across operating system, but I didn't see any.

I believe that device is using an FTDI chip set, which Linux/MacOS/Winders
etc will see as a dynamic serial port that appears at attach time.   You
use open it and used traditional read and write.  FWIW:  If you grab the
sources to the Arduino IDE and look at the interface code in there - it
knows rules on how the port names will be generated in the different OSses
which will be thr one tricky part, since the rules.
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