The console terminal driver won't like you touching the device registers. Don't do that. Use the RT-11 syscalls instead.
Or load your program into the (emulated) bare hardware, and have fun. This communication may not represent my employer's views, if any, on the matters discussed. On 19-Feb-16 16:58, Will Senn wrote: > Given the following test program that I wrote (GETC.MAC): > > .title getc > > .mcall .exit > > TKS = 177560 > TKB = 177562 > ;TPS = 177564 > ;TPB = 177566 > > begin: > inc TKS ;set the ASR read enable bit > getc: > tstb TKS ;is a character available? > bpl getc ;loop until there is > > movb TKB,R0 ;put the character into register 0 > > .exit > > .end begin > > I would expect the console to wait until I typed a single character > and then for the program to exit. What is happening is that the > program appears to accept any number of characters and only ends when > I type CTRL-C twice. > > Here are some questions that arise: > > 1. Is it reasonable to expect to be able to read directly from the ASR > Keyboard buffer while running RT-11 in SimH or does this somehow > compete with the running OS? (I can print characters using the ASR > Punch Buffer just fine) > 2. Is there a flaw in the program? (Nevermind that it doesn't do > anything much with the character). > 3. Is this a totally abnormal way to read a character? > 4. What's up with needing to hit CTRL-C twice? > > Answers to any of the above would be appreciated or if you have > something else, that's fine too. > > Thanks, > > Will > _______________________________________________ > Simh mailing list > Simh@trailing-edge.com > http://mailman.trailing-edge.com/mailman/listinfo/simh
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