RSTS/E Question

[Paul Koning]

>>>>> "Ashley" == Ashley Carder <wacarder at usit.net> writes:

 Ashley> ----- Original Message ----- From: "Ron Hudson"
 Ashley> <ron.hudson at sbcglobal.net> To: "General Discussion: On-Topic
 Ashley> and Off-Topic Posts" <cctalk at classiccmp.org> Sent: Thursday,
 Ashley> September 16, 2004 4:01 PM Subject: Re: RSTS/E Question


 >> > Ron> In a real PDP11 you would have actual terminals/ttys
 >> connected > Ron> to physical serial ports.  In my case I have
 >> Telnet > Ron> sessions..but I don't know how many I can have.. I
 >> suppose one > Ron> for each job (20 or so?) or does the DZ11 limit
 >> the number of > Ron> KBn: s I can have?
 >> >
 >> > It sure does.  If it's a DZ (whether real, or emulated one tied
 >> to a > Telnet session at the emulator) it by definition has 8
 >> ports.
 >> >
 >> > If you want 20 sessions, and they are hooked to DZs, then you'd
 >> have > to have at least 3 DZs...
 >> >
 >> > paul
 >> >
 >> >
 >> Hmm.. In the simulator, I type show dz
 >> 
 >> DZ, address=17760100-17760137*, vector=300-334, lines=32, attached
 >> to 232, 8b, 0 connections
 >> 
 >> Does this mean I have 32 KBn: (KB0 - KB31??)

 Ashley> The console is KB0: and it does not use a DZ11 line.  I
 Ashley> believe that any configured pseudo keyboards would use the
 Ashley> next numbers in the series PK1:, PK2:, for example. ...

The order is: KL/DL11-A; DL11-C/D; DL11-E; PK; DJ11; DH11; DZ11.

Note that PKn: is the controlling end of a pseudo keyboard.  If you
asked for two, then the controlling end is PK0 and PK1, which control
respectively KB1 and KB2 (assuming your only single-line interface is
the console).  Writing to PK0 is "typing" on KB1.

By the way, Linux has the same concept -- "pty".   The "master pty" is
the PKn:, the "slave pty" is the matching KBm:.

The standard use for PKs is batch jobs and network terminal sessions.

    paul