Nope: 2000/1 means 2000 instructions and wat 1 msec which is the resultion of the sleep timer. Reindert From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Supratim Sanyal Sent: Thursday, 18 November, 2021 21:06 To: hecnet at Update.UU.SE Subject: Re: [HECnet] ANF10 network --> DN200/DN20 --> instant gratification ...? On 11/18/21 1:35 PM, Paul Koning wrote: On Nov 18, 2021, at 1:26 PM, Supratim Sanyal <mailto:supratim at riseup.net> <supratim at riseup.net> wrote: On 11/18/21 11:10 AM, R. Voorhorst wrote: Hi, Hi. ... 2. The simh config file for configuring a working simh Pdp11/34 with the proper throttling to make it work; the proper setting is important because of Chk11 init phase which is instruction timing based!!! How does one arrive at a realistic argument for throttle? Did you put 2000/1 because you reckon your host processor does 2000 instructions in the same time as the guest processor does 1? Or is it more pure clock speed based? SET THROTTLE 2000/1 Check the docs ("help set throttle"). The simplest is to say what instruction rate you want: "set throttle 300k" is probably a pretty realistic setting to make it look like an 11/20; "set throttle 2m" is a somewhat optimistic 11/70. I am interpreting the "2000/1" as "wait 2 seconds after one instruction" which cannot be right, hence my question. BTW, throttle is dicey; my MicroVAX 3800 (the SIMH "vax") machines are set to 1.9 mips (3.8 times of the 0.5 mip 11/780), but still they grab 100% of a core running *BSD. But this is a discussion for the SIMH forum, not here. paul --