[Simh] pdp11 - console input with high bit set

[Timothe Litt]

Actually, even parity was more common in the early daze of DEC async. 
MARK always sets the high bit - even sets it only to make the total
number of 1s even.

Quick test: Given that #215 is CR - If the code is looking for #212 for
LF, it's mark.  If it's looking for #012, it's even.

Note also that the digits can also be used - e.g. '0' => 060 - is even,
while 260 would be Mark (or Odd).

Generating the expected format is a function of the terminal emulator.

On 24-Jul-20 04:37, Johnny Billquist wrote:
> You need to have your terminal set to MARK parity.
>
>   Johnny
>
> On 2020-07-24 01:56, Paul Moore wrote:
>> I am trying to run an RK11 diagnostic and am stuck.
>>
>> The diagnostic asks the user how many drives to test and I can get
>> the input to work
>>
>> 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.
>>
>>
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>
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