From: muta...@gmail.com   
      
   On Tuesday, June 15, 2021 at 8:13:43 PM UTC+10, Joe Monk wrote:   
      
   > > For what reason does telnet support EBCDIC? Who    
   > > else is emitting EBCDIC and what does the data    
   > > stream look like?   
      
   > On my macOS shell (terminal app), I can set the code page to Western (EBCDIC   
   latin 1), which as I understand it is code page 037.   
      
   Ok, cool.   
      
   > I connect (in ASCII to kerravon.mooo.com port 64000). Then I change the code   
   page to the above. Pressing ENTER does nothing, so I type a "?", which gives   
   me:    
      
   If ENTER does nothing, try it again. The BBS should react   
   to that and complain. Unless nothing is being sent.   
      
   > …"Welcome to the Ten Minute Limit BBS…Back in action 24 years after a   
   fascist kicked me off Fidonet…brought to you in glorious EBCDIC…enter an   
   option below:…1. Message area (not yet implemented)…2. File area (not yet   
   implemented)…3. The    
   highest quality porn ever produced (coming soon)"    
   >    
   > When I press a single character, it just sits there, and does nothing.When I   
   type a "1" followed by the ENTER key, it gives me:    
   >    
   > "You entered an invalid option! (hex 71)…it wasn't even a digit!!!…   
      
   Ok, I'm thinking the Mac software is stripping the high bit, and   
   at some point it did actually generate a hex F1.   
      
   I doubt that it is my end that is stripping it.   
      
   > (coming soon)…ÝJYou   
      
   That funny "Y" character is probably the ESC. It's not   
   interpreting the ANSI escape sequence, ESC [ 2 J   
   It will have never been exposed to that before I think.   
   Although I don't know how IBM USS or whatever it is   
   called manages to run emacs and vi. Don't they send   
   ANSI control characters to drive a terminal? They're   
   running in an EBCDIC environment - what choice do   
   they have?   
      
   Note that you can see the BBS software here, it's not   
   that complicated:   
      
   https://sourceforge.net/p/pdos/gitcode/ci/master/tree/s370/bbs.c   
      
   Ah, actually - the "Y" is probably "[". If you're using 037   
   instead of 1047, the "[", which is sent as x'AD', will not   
   be translated correctly. Even if the Mac recognized   
   EBCDIC ANSI escape sequences.   
      
   > entered an invalid option! (hex 0A)   
      
   And this looks like an ASCII newline that was never translated   
   to EBCDIC. It should have been converted to one of LF x'25',   
   CR x'0D', NL x'15'. It is only the last one that is used anywhere   
   in my software.   
      
   So it sounds like multiple issues.   
      
   Very interesting!!! Thanks for doing that test. ASCII and   
   EBCDIC colliding.   
      
   BFN. Paul.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)