TOPS-20 I/O

[JONL at MIT-MC (Jon L White)]

Some bugs I' recently aware of
1) OPENs on the TTY device have a low probability of winning, in particular
   (OPEN '((TTY)) '(IN FIXNUM SINGLE TTY)) produces a file object which
   barfs when you try IN on it;  some other options even cause an Ilgl mem
   ref.  
2) OPEN with the APPEND option fails.