[HECnet] TOPS20 on simh

[Bob Armstrong]

  Are there any HECnet'ers running TOPS20 on simh?   Have you gotten the idle
detection to work?

  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 for me.

  I did try posting this question on the simh list, but got no comments so I
guess nobody there is using TOPS20.   And yes, I could use KLH10, but AFAIK
KLH10 has no idle detection feature at all.

Thanks,
Bob