New batch of pdp8 OMNIBUS to USB interface! Please Read and react!
hachti at hachti.de
Wed Feb 15 08:45:55 CST 2017
On 02/15/2017 03:40 PM, COURYHOUSE at aol.com wrote:
> I have not heard of 40 mil loop here on ttys... generally 20 mil or
> 60 mil. - At least what I have encountered. Is the 40 mil. standard in
I have not heard about 60mA - at least not in the Telex network.
All mechanical 5 step teleprinters I have ever seen and owned run on
40mA. And my test equipment has a mark on the scale at 40mA.
I thought that this is international. But I also know that with respect
to teleprinters there are some CCITT norms that are internationally used
- except for the US.
It starts with ITA2 code which is the official international 5-bit telex
code. But US uses "US-TTY" which slightly differs.
Only the ASCII stuff (asr 33/35 etc) run on 20mA. But that's a totally
> Ed# _www.smecc.org_ (http://www.smecc.org)
> In a message dated 2/14/2017 2:24:15 P.M. US Mountain Standard Time,
> hachti at hachti.de writes:
> On 14.02.2017 22:18, geneb wrote:
>> On Tue, 14 Feb 2017, ben wrote:
>>> On 2/14/2017 6:27 AM, Alfred M. Szmidt wrote:
>>>> FWIW, Mini-B connectors are on their way out, nor USB OTG compliant.
>>>> Though agreed that they are flimsy... Why not just a type A or
>>>> something? Easy, big, and robust.
>>> Why not mini and regular?
>>> PS: Add a 45.5 baud serail port. Control everything with a 5 level
>>> TTY. :)
>> Dirty casual. 20mA current loop or nothing.
> The 45 baud machines do NOT run on 20mA. They usually run on 40mA :-)
> 20mA is the domain of model 28, 32, 33 etc.
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