Clock calibration normally takes several seconds to zero in on somewhat
accurate values for reasonable synchronization of simulated time to wall
clock time. Often this doesn't matter one way or another. However,
one thing which requires somewhat accurate clock calibration is the
pacing of output to serial ports on the host system. Pacing happens
at the configured bits per second rates as long as the simulators
instruction execution rate has been reasonably calibrated with respect
to wall clock time. A given host system will most likely simulate
instructions at the same rate from one run to the next, so running a
simulator for a little while and then examining the execution rate with
the SHOW CLOCK command can provide knowledge about the calibrated
execution rate which can be used to start a future simulator's execution
with a very good estimate of what the ultimate calibrated rate will be.
If the SHOW CLOCK shows simulator execution at 120,000,000 instructions
per second, and the simulated system has a simulated clock that runs at
60 hz, then the pre-calibrated values can be set with these commands:
sim> DEPOSIT INT-CLOCK TICK_SIZE_0 2000000
sim> DEPOSIT INT-CLOCK TICK_RATE_0 60
sim> DEPOSIT INT-CLOCK INTERNAL_TICK_SIZE 12000000
The INTERNAL_TIMER runs in the background whenever the simulator
doesn't have a calibrated timer running. It runs at 10 Hz.
- Add "SHOW STACK" support to CPU
- An off-by-one error in checking SDT length was fixed.
- not-present co-processor R/W should not set Bus timeout bit
Previously, only long delays that would transition the next clock
calibration would be coscheduled unless an explicit timer was
specified to coschedule with.
This may help with the problem discussed in #508
Under CYGWIN the conditional tests in the altairz80_sio.c source file for the
SIMH pseudo device's getHostsFilenamesCmd and resetSIMHInterfaceCmd
functions need to have UNIX_PLATFORM set to 1 - otherwise they do nothing!
With this fix, the HDIR host command from CP/M now displays a list of files
in host system's current directory under CYGWIN.
- New Commit-Id with Commit-Time
- Properly execute when the Win32-Development-Binaries needs to be cloned
- Properly limit parallel builds if the local system has more than 8 Threads
When the git hooks have changed and git isn't in the path, the correct git
commit id can't be determined and thus be available to be included in
the build. This change announces that fact and stops a build.
This only happens if git is installed locally and available in the current
path when Visual Studio executes. Whether git is in the path is an
installation option when git for Windows is installed.
Otherwise, proper results should be available after subsequent
activity on the local repository. Any build will install the git hooks
that properly populate .git-commit-id when any changes are made
to the local repo.
- added deferred IO and RELEASE button simulation
- added SET TTY 1DIGIT
- added SET LPT NOFF
- numerous fixes from Tom McBride, Bob Armstrong, and Dave Wise
