[GreenKeys] ASR 33 channel 8 always inverse...why?

[Steve Garrison]

The ASCII character set only uses seven bits. The eighth bit on the  ASR 33 is only used if you are generating parity.  So that must be what you are experiencing.  You used the term ‘printed’ when I think you are really referring to ‘punched’ in the paper tape.  Printed would be on the paper on the platen, and there you can not see if the eighth bit is even used.  Unless you look at the punched tape.

Hope that helps.

Steve G./N4TTY
Sent from my iPhone

> On Jun 27, 2022, at 2:41 AM, Ethan Blanton via GreenKeys <greenkeys at mailman.qth.net> wrote:
> 
> B Degnan via GreenKeys wrote:
>> Hi.  I was wondering what might cause pin/channel 8 to always go
>> inverse of what was typed at the keyboard.  Results in the wrong
>> character to print.  For example, if the ascii character was --34-6--
>> , the character printed would be --34-6-8. If the character was
>> --34-6-8 , the character printed would be --34-6--
> 
> Is that actually what's happening, or is it possible that it is
> applying even parity?  For example, does --34-6-- turn into --34-6-8,
> but 1-34-6-8 turns into 1-34-6--?  (Note that the resulting code, in
> both cases, has an even number of mark bits.)
> 
> Ethan
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