🚀 go-pugleaf

     From a beginner.
 
     I need to drive a graphics tube through COM2 using watcom
fortran.  I am able to write to the tube but not able to read from it
using 
  
     OPEN (8,FILE='COM2') etc.

     The same thing happens in vanilla DOS with CTTY COM2, 
I get the DOS prompt on
the dumb terminal and can even type but then when I hit the return key
it either freezes or I get,
General error reading com2.  This also happens with a dumb terminal
in place of the graphics tube.
 
     The pc is willing for me to type at the 'abort, retry, fail'
prompt, and even echoes back what I type giving me the message over
and over again, but when I hit the return
key it jams again.  Hitting the break key gets me back to the prompt.
I can type commands at the prompt but when I hit the return key
it freezes.

     Kermit on the other hand is able and willing to both read and
write between my pc and anything I stick on com2 including the
graphics tube and the dumb terminal.  Of course kermit is passing
nothing to the command interpreter, and I feel that its not a problem
with reading but with the returns or something else.

     I am using a null modem cable
 
        2 ------ 3
        3 ------ 2
        4 ------ 5
        5 ------ 4 
        6 ------ 20
       20 ------ 6
        7 ------ 7
        8 ------ 8
 

     Need help desperately,
 
     Homer