I set up a TOPS20 system with simh (simh v3.8.1 on Ubuntu, TOPS20 v4.1
clean install). The installation went fine with no problems, but I cannot
get the idle detection feature in simh to work. I say -
pdp10
sim> att rp0 tops20-4.1.rp06
sim> set cpu tops20
sim> set cpu idle tops20
sim> show cpu
CPU, idle enabled, stability wait = 20s, 1048KW, TOPS-20
sim> b rp
....
Everything boots and runs fine, but simh uses about 98% of the host CPU and
never goes down. In an hour of wall clock time the pdp10 process uses about
58+ minutes of CPU time. Clearly the idle detection isn't working - is it
broken, or am I doing something wrong?
BTW, I find that I can break the emulation and usually I'll see
Simulation stopped, PC: 000003 (SOJG 2,3)
According to the simh doc, SOJG 2,3 running in AC3 is the expected TOPS20
idle job, so that part hasn't changed.
Thanks,
Bob Armstrong
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