RSTS/E Question

From: Paul Koning <>
Date: Thu Sep 16 15:23:34 2004

>>>>> "Ashley" == Ashley Carder <> writes:

 Ashley> ----- Original Message ----- From: "Ron Hudson"
 Ashley> <> To: "General Discussion: On-Topic
 Ashley> and Off-Topic Posts" <> 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.

Received on Thu Sep 16 2004 - 15:23:34 BST

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