[Simh] Porting simh for IBM VM/CMS

[rubhone at aol.com]

Dave,


You need not be amazed; your idea is sound and as you mentioned, getting the brackets
right was the worst of it.  Congrats on the code transformation from simply "nasty" to
"really horrid" and finally "truely noxious".  I'll insert some line breaks and comments to
make it potentially readable.  (Here I thought APL was the only write-only language.)


Perhaps this original code struck you as nasty because it is really a hidden OS dependency,
is it not?  Or are character set arrangements not included in that realm?


Thinking about related matters, do I need to be concerned that the IBM systems are
big endian?  It appears that simh takes this into account with the sim_finit routine in sim_fio.c,
but there could be other places with data coding assumptions not fitting the /370 architecture.

For the moment, I hacked the "attach" <dev>" code to avoid a rb+ file open attempt since
the CMS implementation of the stdio package does not support simultaneous r/w file access.
This will surely prove to be another big problem, but for now the attach is successful for an
existing file.


Fritz


-----Original Message-----
From: Dave G4UGM <dave.g4ugm at gmail.com>
To: rubhone <rubhone at aol.com>
Cc: 'simh' <simh at trailing-edge.com>
Sent: Fri, Jul 31, 2015 7:09 am
Subject: RE: [Simh] Porting simh for IBM VM/CMS


 
  
I am amazed, and very glad, it works, been ages since I wrote any “C” ….
  
.. and as for threads, well they are hidden in the headers, and should just pick up again. 
  
 
  
Dave Wade
  
G4UGM
  
 




          
         
        
       
      
     
    
   
  
 


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