[GreenKeys] the rareness of the KSR 35 vs ASR 35

[Dave]

On 13/12/2013 23:19, Christian Gauger-Cosgrove wrote:
> If you want to run an IBM mainframe system, you develop a much more 
> difficult problem, of needing to convert the raw TTY traffic into 
> telnet. Though, you can emulate any System/370 and upwards machine; 
> but as I'm unsure of whether MTS has been resurrected it may not be 
> all that useful to you unless you feel comfortable 
> configuring/reconfiguring/sysgen'ing the operating systems that I know 
> for certain are available (OS/360 21.8F, MSV 3.8J, and VM370 
> version-I-cannot-remember). 

"much more difficult problem, of needing to convert the raw TTY traffic 
into telnet"

I can't see why this is difficult. If your TTY speaks RS2323 then plug 
it into any Linux box and you should have a console session, login and 
telnet to a local or remote Hercules. I haven't tried it with a TTY but 
I have used a Televideo "green screen" with TN3270 onto MTS and that 
works. The Raspberry PI would probably be good for this. It has a serial 
port but its LV-TTL (3.3Volt) so you need a converter. For RS232 you can 
buy cables with RS232 converters in the D-Type for a few dollars on 
e-bay. For current loop you can build a daughter board to drive the 
loop. Something like the ST-5 interfaces but I guess you only need 20MA.

The sad thing is that whilst MTS is available the tools to re-configure 
it for TTY support are not included. However the free VM/370 already has 
at least one TTY port configured. It also has some IBM3101 ports (an IBM 
serial terminal) which can also be accessed by line mode TTY and should 
work with a real TTY.

I have used it with a "green screen" terminal and TN3270. If any one is 
interested I will have a look at zapping the tables, which I will 
probably try at some point as I want to run APL into a real golfball 
terminal. A few things are stopping me , such as zapping the tables, the 
need to collect the terminal from the other side of the UK, and no 
interface to a PC. (its well more complex as I don't have some parts ....)

Dave
G4UGM

P.S. I am currently working on getting the 5-level Creed equipment which 
formerly connected to the Pegasus at MOSI (www.mosi.org.uk) running. 
Pictures and Video logs can (possibly) be viewed here:-

https://plus.google.com/photos/109617668049845980735/albums?banner=pwa

or here :-

https://picasaweb.google.com/109617668049845980735?noredirect=1

but google seems to be changing everything at once....