[GreenKeys] USB-teletype adapters (update)

[Eric]

On 03/28/2016 9:27 am, Jones, Douglas W wrote:
> On Mar 28, 2016, at 11:13 AM, Gil Smith wrote:
> 
>> So, not including the start/stop bits:
>> 
>> 33 format is technically 7 bit plus parity or 7 bit plus mark for a 
>> total of 8 bits (7-P-2 or 7-M-2).
> 
> I believe Model 33 was also available with 7 plus space.  DEC ASCII
> paper tape tended to have bit 8 punched all the time, but I recall
> using TTYs that always had bit 8 unpunched, and others, of course,
> where bit 8 was parity.
> 
> Any USB to current loop device ought to support all 3 flavors.
> 
> I know that many glass TTYs had option switches for all 3 flavor (I
> have some ADM 31 and ADM 5 terminals gathering dust.  They support
> both current loop and RS232 interfaces).
> 
> 		Doug Jones
> 		jones at cs.uiowa.edu

Heh. This whole thing was intended for 5-bit only, to replace the cp2102 
solution and have an option for character set translation. The ascii 
stuff was just an afterthought, because I was surprised to note that the 
hardware technically could kind of manage on a 20mA loop as well as 
60mA. :) I might try to get 8-bit passthru working for now and save the 
large menu of parity, etc options for another firmware revision.

eric

> 
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