These changes facilitate more robust parameter type checking and helps
to identify unexpected coding errors.
Most simulators can now also be compiled with a C++ compiler without
warnings.
Additionally, these changes have also been configured to facilitate easier
backporting of simulator and device simulation modules to run under the
simh v3.9+ SCP framework.
Previously, the input silo was modeled by using the pending input data in
the TMXR line buffer. This was fine when bps rate limiting wasn't happening.
In order to properly pace arriving data from multiple lines the silo is now
implemented in a way which more precisely reflects the original hardware.
Each of the speeds greater than 9600bps deliver a character in less than
1ms. Computing inter-character delays in microseconds therefore can't
be precise enough to be well behaved. Measuring the inter-character
delays in instructions (scalled by the calibrated clock) gets us the needed
precision.
Data arriving on simulated serial ports can arrive faster than the OS running
on the simulated system can deliber it to user mode programs. This happens
when chunks of data are delivered to the mux from a network connection.
This can be due to a file transfer program (kermit) running on the other end
of a network connection and the packet size being delivered exceeds the
simulated OS's type ahead buffer size OR from users who paste arbitrary
blocks of data into a telnet or console session.
The goals here being to simplify calling code while getting consistent output delivered everywhere it may be useful.
Modified most places which explicitly used sim_log or merely called printf to now avoid doing that and merely call sim_printf().
Show IOSPACE doesn't always get the number of devices right due to device creativity.
o The distinction between UNIT and DEVICE has blurred
o MUX devices merge several physical devices into one device/unit
o Dynamic device sizing has made things more volatile.
This edit solves the problem for SHOW IOSPACE by adding an (optional) word to the DIBs.
The word contains the amount of IO space consumed by each instance of the physical device that's being emulated.
E.G., if it's a DZ11, the device is the DZ11 module, or 8 lines, even though the MUX device may support 32.
This enables SHOW IOSPACE to determine the number of physical devices being emulated, which is what folks need when configuring software. The word may have other uses - in a generic dynamic device sizing routine - which is why the amount of IOSPACE per device was chosen rather than the 'number of physical devices.'
The edit should not make any existing device regress. If the new word (ulnt) is zero (not initialized), SHOW IOSPACE will default to the number of units in the device, or if there's no device (CPUs), 1 as before. If it is present, the number of devices is the calculated as total allocation/allocation-per-device.
The edit updates all the devices that seem to require this treatment, and all the processors that define the UNIBUS/QBUS DIBs.
Fixed auto configure bugs which didn't allow Fixed CSR Addresses or Fixed Vectors to be set using the auto configure information.
Fixed display of address and vectors to indicate that the assigned address and/or vector is in the floating set.
Added extended definitions to the auto configure table to reflect all known potential static and floating and static addresses as of VMS V5.5-2
Changed the name of the VAX 11/780 console floppy device name to RXC from RX (which collides with a Unibus name for the RX11).
scp.c, scp.h
- added sim_uname (Unit Name) API to simplify places which might want to display it (mostly debug messages).
- added support for clock co-scheduling
- added debugging to trace event queue activities
sim_defs.h
- added support for clock co-scheduling
- added support for sim_uname (Thread local storage macro)
- added support for debugging to trace event queue activities
- simplified debug code by using sim_uname
- fixed support macro for sim_is_active when asynch timers are in use
sim_rev.h
- fixed nested comments
sim_tmxr.c, sim_tmxr.h
- added support for clock co-scheduling
- simplified debug code by using sim_uname
- added support for devices which poll for output on different units
sim_timer.c, sim_timer.h
- added support for clock co-scheduling
- fixed asynchronous clock calibration to smooth out calibration adjustments
- simplified debug code by using sim_uname
- added ability (when running with asynchronous support) to explicitly disable or enable asynchronous timer support.
- changed sim_timer_inst_per_sec to return a double value since the result is always used in a double expression and integer overflow could occur under strange timing conditions
vax/vax_stddev.c
- converted from simulator specific clock co-scheduling to generic clock co-scheduling.
vax/vax_cpu.c
- added EVENT and ACTIVATE debug flag (SET CPU DEBUG=EVENT;ACTIVATE) support
pdp11/pdp11_dz.c
- converted from simulator specific clock co-scheduling to generic clock co-scheduling.
pdp11/pdp11_vh.c
- converted from simulator specific clock co-scheduling to generic clock co-scheduling.
pdp11/pdp11_xq.c
- converted from simulator specific clock co-scheduling to generic clock co-scheduling.
Added support for per line tcp listen ports.
Added support for per line outgoing tcp/telnet connections.
Removed DEV_NET from pdp11_dz and pdp11_vh emulators to allow proper restore of
scp.c, scp.h, sim_defs.h
- Added commands:
SHOW MULTIPLEXER (MUX)
SHOW TIMERS
- Added facilities/APIs:
sim_activate_after - time specific event scheduling (vs instruction scheduling) API visible, optional separate thread implementation in a later revision
- Changed Commands:
SET CONSOLE DEBUG no longer affects global debugging, but merely debugging for the console subsystem. Use SET DEBUG and SET NODEBUG to affect global debugging.
- Added Asynchronous polling support
sim_tmxr.h, sim_tmxr.c
- Added Asynchronous capabilities to the multiplexer subsystem to avoid polling for input and to deliver input data instantly when it arrives instead of delaying for up to one or more full simulated clock ticks.
- Added debug trace support
- Added statistic tracking of total bytes transmitted on each line
- Added more aggressive attempts to flush transmit buffers when they fill before dropping tranmitted characters
- Fixed status return of tmxr_putc_ln to return SCPE_LOST if the transmitting line isn't connected or buffered.
sim_console.h, sim_console.c
- Fixed issue where connections to console telnet sessions would succeed for the first connection, but hang indefinitely for additional connects without rejecting due to all lines being busy. This is handled by using an internal device and unit to hang the required polling on. Connection polls happen once per second.
- Added console debugging/trace support.
- Added Asynchronous capabilities to the console subsystem to avoid polling for input and to deliver input data instantly when it arrives instead of delaying for up to one or more full simulated clock ticks.
- Added tmxr_set_console_input_unit() API to support asynchronous simulator console I/O
sim_timer.h, sim_timer.c
- Added SHOW TIMERS support
- Added mechanism to capture the timer the simulator uses for its clock tick and make this timer globally available for other uses
PDP11/pdp11_dz.c
- Added debug trace support
PDP11/pdp11_vh.c
- Added debug trace support
- Changed timing mechanisms to not assume that the count unit service routine calls measures the passage of time, and created a separate unit to measure time.
VAX/vax_stddev.c
- Added call to tmxr_set_console_input_unit to leverage Asynchronous console I/O
