I1620 : Changes from Bob Supnik re: Bob Armstrong has been running diagnostics and software, and these changes reflect fixes to bugs that were found.

We're not absolutely sure that all of the changes are correct - in particular the treatment of record marks in add/compare - but they do make the diagnostics pass, which they didn't before.

Bob asked for variable tab stops on the typewriter, and those are implemented as well. The routines were general enough that I put the SET/SHOW processors in sim_console.c, so I'm enclosing that and its header file.

Conflicts:
	I1620/i1620_cpu.c
	sim_console.c
	sim_console.h

sim_console.h

@@ -1,6 +1,6 @@
 /* sim_console.h: simulator console I/O library headers
 
-   Copyright (c) 1993-2008, Robert M Supnik
+   Copyright (c) 1993-2014, Robert M Supnik
 
    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
@@ -23,6 +23,7 @@
    used in advertising or otherwise to promote the sale, use or other dealings
    in this Software without prior written authorization from Robert M Supnik.
 
+   02-Jan-14    RMS     Added tab stop routines
    17-Jan-11    MP      Added buffered line capabilities
    22-Jun-06    RMS     Implemented SET/SHOW PCHAR
    22-Nov-05    RMS     Added central input/output conversion support
@@ -92,6 +93,8 @@ t_stat sim_ttclose (void);
 t_bool sim_ttisatty (void);
 int32 sim_tt_inpcvt (int32 c, uint32 mode);
 int32 sim_tt_outcvt (int32 c, uint32 mode);
+t_stat sim_tt_settabs (UNIT *uptr, int32 val, char *cptr, void *desc);
+t_stat sim_tt_showtabs (FILE *st, UNIT *uptr, int32 val, void *desc);
 
 extern int32 sim_int_char;                                  /* interrupt character */
 extern int32 sim_brk_char;                                  /* break character */