[GreenKeys] Model 28 with a new problem

[Harold Hallikainen]

Yes, "sent" may not be the proper word. I've been trying to help Mike with
this since he's local, but I have no experience with the 28. He is doing
two sets of tests. The bit 5 issue is showing up on a local loop keyboard
to typing unit. The issue is not the keyboard since ITTY ALSO prints
giberish. I think it has printed one word correctly (AGE, I think). So, I
think the issue is in the decoding or the mechanical transmission of the
bits to the carriage and the positioning of the typebox.

Harold


On Sat, October 2, 2021 12:02 pm, hwhall at compuserve.com wrote:
>>what could be causing a MARK to be sent on bit 5 in cases where it should
>> be a SPACE?
>
> Might be asking the wrong question, it might be "what could be causing
> those bit 5 characters to be decoded & printed incorrectly?" Â IOW, the
> code may be getting sent correctly but decoded incorrectly. Â That the
> characters have a common denominator in the type box sounds suspicious.
>
> WayneWB4OGM
> -----Original Message-----
> From: Mike McAuley <mmcauley at cox.net>
> To: Green Keys <greenkeys at mailman.qth.net>; John <john-koster at tx.rr.com>;
> harold at w6iwi.org
> Sent: Sat, Oct 2, 2021 11:54 am
> Subject: [GreenKeys] Model 28 with a new problem
>
> So I got the code bar 3 issue fixed as far as I can tell.  I can see all
> five code bars shifting back & forth.
> But now there is a new issue...
> A types as WE types as ZI types as PS types as YU types as Q
> 3 types as quotation mark7 types as 18 types as 0Dash types as 2STOP types
> as hashtagSpacebar types as HLine feed types as L
> Now I was sleuthing the bit codes for all those keys and from what I see,
> the common denominator is bit 5.
> On those keys, a bit 5 SPACE is being turned into a MARK.  On other
> characters where bit 5 is *supposed* to be a Mark, they are typing fine.
> AND... it's not doing it on ALL the keys where switching bit5 from S to M
> would change the character.  For example, typing C does not change to V.
> I can also see that these affected characters happen to lie in the center
> four columns on each side of the typebox (middle four for the FIGS
> section, & middle four for the LTRS section.)
> The bit 5 code bar is NOT stuck. I can see it freely running back & forth
> between M & S.
> So the question is: what could be causing a MARK to be sent on bit 5 in
> cases where it should be a SPACE?
> Any thoughts, ideas or suggestions appreciated 
>
> 73s
> MikeKD7VRG______________________________________________________________
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