[Simh] TOPS-20 4.1 Cobol 12c Sample test failure

[Pascal Parent]

Thank you for the suggestion. I did try the test using KLH10/kn10-ks which
I built from source but I was running into console I/O issues. Instead of
the BOOT prompt, I would get this after hitting enter:

KLH10# go
Starting KN10 at loc 040000...
[CTYI: 15 => 415, old 415][CTYI: 15 => 415, old 415][HALTED: FE interrupt]

My guess is that this is the result of remedial code adjusting console
timing and not working properly. Processors have gotten much faster since
KLH10 was written. I tried again on a -much- slower PC and I was able to
boot TOPS-20 using the simh disk image. For that I needed to specify dlw8
for the disk format instead of dbd9 in the devdef command.

The Cobol test is successful on KLH10 emulating a KS10 so it now appears
that this is a SIMH specific issue.

Pascal.

On Tue, Nov 1, 2016 at 11:31 AM, Rich Alderson <
simh at alderson.users.panix.com> wrote:

> > From: Pascal Parent <pascguyz at gmail.com>
> > Date: Thu, 27 Oct 2016 22:55:48 -0700
>
> > I installed TOPS-20 V4.1 and COBOL-74 12C in SIMH. However, I am running
> > into an error when trying to run the XT74 sample in UETP.LIB.
>
> > I also installed Cobol 12C from the same tape on the Panda Distribution
> > using the KLH10 emulator. There the test is successful.
>
> > See the from both systems below.
>
> > Could this be explained by a difference between the KL-10 (KLH10) and KS
> > (SIMH) simulated hardware or is it a symptom of a bug in SIMH? I am
> running
> > this version:
>
> > "PDP-10 simulator V4.0-0 Beta        git commit id: cf1e7b9c"
>
> > Let me know if there is any other information I can provide that would be
> > useful.
>
> I ask out of curiosity:  Did you try the same test on the KLH10 *KS10*
> emulation?  Then you would be comparing apples to apples, rather than
> sloths
> to gazelles.
>
>                                                                 Rich
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