Notes For V3.8

The makefile now works for Linux and most Unix's. However, for Solaris
and MacOS, you must first export the OSTYPE environment variable:

> export OSTYPE
> make

Otherwise, you will get build errors.

1. New Features

1.1 3.8-0

1.1.1 SCP and Libraries

- BREAK, NOBREAK, and SHOW BREAK with no argument will set, clear, and
  show (respectively) a breakpoint at the current PC.

1.1.2 GRI

- Added support for the GRI-99 processor.

1.1.3 HP2100

- Added support for the BACI terminal interface.
- Added support for RTE OS/VMA/EMA, SIGNAL, VIS firmware extensions.

1.1.4 Nova

- Added support for 64KW memory (implemented in third-party CPU's).

1.1.5 PDP-11

- Added support for DC11, RC11, KE11A, KG11A.
- Added modem control support for DL11.
- Added ASCII character support for all 8b devices.

1.2 3.8-1

1.2.1 SCP and libraries

- Added capability to set line connection order for terminal multiplexers.

1.2.2 HP2100

- Added support for 12620A/12936A privileged interrupt fence.
- Added support for 12792C eight-channel asynchronous multiplexer.

1.3 3.8-2

1.3.1 SCP and libraries

- Added line history capability for *nix hosts.
- Added "SHOW SHOW" and "SHOW <dev> SHOW" commands.

1.3.2 1401

- Added "no rewind" option to magtape boot.

1.3.3 PDP-11

- Added RD32 support to RQ
- Added debug support to RL

1.3.4 PDP-8

- Added FPP support (many thanks to Rick Murphy for debugging the code)

1.3.5 VAX-11/780

- Added AUTORESTART switch support, and VMS REBOOT command support

2. Bugs Fixed

Please see the revision history on http://simh.trailing-edge.com or
in the source module sim_rev.h.

sim_timer.c

@@ -1,6 +1,6 @@
 /* sim_timer.c: simulator timer library
 
-   Copyright (c) 1993-2008, Robert M Supnik
+   Copyright (c) 1993-2010, 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.
 
+   29-Dec-10    MP      Fixed clock resolution determination for Unix platforms
    22-Sep-08    RMS     Added "stability threshold" for idle routine
    27-May-08    RMS     Fixed bug in Linux idle routines (from Walter Mueller)
    18-Jun-07    RMS     Modified idle to exclude counted delays
@@ -298,19 +299,6 @@ return;
 
 uint32 sim_os_ms_sleep_init (void)
 {
-#if defined (_POSIX_SOURCE)                              /* POSIX-compliant */
-
-struct timespec treq;
-uint32 msec;
-
-if (clock_getres (CLOCK_REALTIME, &treq) != 0)
-    return 0;
-msec = (treq.tv_nsec + (NANOS_PER_MILLI - 1)) / NANOS_PER_MILLI;
-if (msec > SIM_IDLE_MAX) return 0;
-return msec;
-
-#else                                                   /* others */
-
 uint32 i, t1, t2, tot, tim;
 
 for (i = 0, tot = 0; i < sleep1Samples; i++) {
@@ -320,13 +308,9 @@ for (i = 0, tot = 0; i < sleep1Samples; i++) {
     tot += (t2 - t1);
     }
 tim = (tot + (sleep1Samples - 1)) / sleep1Samples;
-if (tim == 0)
-    tim = 1;
-else if (tim > SIM_IDLE_MAX)
+if (tim > SIM_IDLE_MAX)
     tim = 0;
 return tim;
-
-#endif
 }
 
 uint32 sim_os_ms_sleep (unsigned int milliseconds)