One additional observation: If I turn on throttling with values ranging from
"set throttle 100k" to "set throttle 99%" then **all** the Win32 development versions of IBM1130.exe I've tried, including the ones from before Jan. 29, 2016, exhibit the behavior that I'm interpreting as "broken" -- i.e., the simulator never enters a "Wait" (and drops back into the "sim>" prompt, thereby freeing up the GUI), either after DMS boots or after a program finishes executing. The Win32 development executables from github I've tried have all been running on a Windows XP machine, but I also tried the experiment on a 64-bit Windows 7 machine using the 64-bit IBM1130.exe from a suite of SimH executables I built myself using gcc (5.1.0) under MinGW back in June, 2015. That 64-bit/Win 7 version behaves the same as the 32-bit/WinXP Win32 development builds from on or before January 7, 2016 -- i.e., correctly if throttling is not used, broken otherwise.
