[Simh] pdp11 - console input with high bit set

[Johnny Billquist]

On 2020-07-24 19:53, Ethan Dicks wrote:
> On Fri, Jul 24, 2020 at 1:13 PM Paul Moore <paulmoore100 at hotmail.com> wrote:
>> Johnny, I don't know what that means for simh
> 
> On an xterm session, there may not be a way to do it.  If you were
> running simh from a dumb terminal on a serial port, you could set your
> terminal to do 7E1 (even parity), and possibly a matching  "stty
> parenb -parodd" , but the arg 'parenb' appears not to be valid from a
> window session.

7E1 obviously will not work when the software is expecting MARK parity. 
stty settings might work, but I would generally assume that simh would 
remove such things so that it can instead be applied inside the 
simulation, if wanted.

Of course, right now my mind is drawing a blank, but I'm trying to 
remember if 7N2 could actually be a trick. But I can't remember if the 
stop bits equals mark or space.

But if you have a reasonable terminal, it should be able to also 
properly do MARK parity as well.

   Johnny

> 
>> From: Johnny Billquist <bqt at softjar.se>
>> Sent: Friday, July 24, 2020 1:37:27 AM
>> To: Paul Moore <paulmoore100 at hotmail.com>; Simh at trailing-edge.com <Simh at trailing-edge.com>
>>
>> You need to have your terminal set to MARK parity.
>>
>> On 2020-07-24 01:56, Paul Moore wrote:
>>> I am trying to run an RK11 diagnostic and am stuck.
>>>
>>> Looking at the code, it is looking for digits and then cr.
>>>
>>> But it is actually looking for  #215, which is 0x8d. Which is CR with
>>> the high bit set. (It also looks for #377 del with HB set)
>>>
>>> So what happens is that it just keeps reprompting
>>>
>>> I don’t see how that character ever gets into the system. I did ‘set tti
>>> 8b’ but it made no difference. I can post the relevant code if needed.
> 
> Does "set tti 7p" work for this?
> 
> -ethan
> 

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol