tops20 assembly tutorials

David Griffith dave at
Fri Mar 11 17:47:49 CST 2016

On Thu, 10 Mar 2016, Rich Alderson wrote:

> From: David Griffith
> Sent: Wednesday, March 09, 2016 4:14 PM
>> On Tue, 8 Mar 2016, Rich Alderson wrote:
>>> From: David Griffith
>>> Sent: Monday, March 07, 2016 11:53 PM
>>>> Specifically I'm trying to build and run this:
>>>>          CIRC 2,-^D18
>>> Where did this code come from?
>> I got it from Jan deRie when I asked about it on a Youtube video[1]
>> showing the Panda Display in action.
> Something just occurred to me.
> Exactly *where* are you trying to run this program?  On a kn10-kl (the
> extended KL-10 CPU defined by klh10), on a SimH KS-10, or on a real CPU
> (KL, KS, or Toad)?
> I just had a look at the klh10 sources and find that Ken Harrenstien
> added the CIRC instruction to his KL emulation as well as his KS
> emulation in 2002.  If you're running any klh10-based emulation, that
> instruction ought to work.  It would only work on MIT-specific real
> hardware.

It's a kn10-kl.  I'm using the Panda distribution as downloaded from

David Griffith
dave at

A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?

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