[Simh] SimH as microcode simulator

[Bob Supnik]

SimH is pretty much a knockoff of MIMIC, which was used for microcode 
verification of the LSI11... so it should work fine.

For microcode, the hardware has to be modeled with extreme care, 
particularly for operations happening in parallel, and the timing has to 
be accurate. Most SimH simulators time in instructions, but that's 
arbitrary. You can time in any unit you want (like nanoseconds). STEP 
would require some work, of course.

/Bob

On 7/1/2019 12:00 PM, simh-request at trailing-edge.com wrote:
> Message: 3
> Date: Mon, 01 Jul 2019 15:59:42 +0000
> From: Lars Brinkhoff<lars at nocrew.org>
> To:simh at trailing-edge.com
> Subject: Re: [Simh] Which PDP-11 to choose
> Message-ID:<7wblydbv9t.fsf at junk.nocrew.org>
> Content-Type: text/plain
>
> Bob Supnik wrote:
>> The J-11 based simulators (11/73 and up) are the only ones that were
>> verified against actual machine microcode.
> Speaking of which.  Someone claimed SIMH wouldn't be well suited for a
> microcode level simulation.  Is there any truth to this?  If so why?
>
> Asking for a friend.
>
>