[Simh] More VAX 11/750 Testing

[Mark Pizzolato - Info Comm]

Hi Henry,

Can you connect me with a disk image (and config file) for the VAX750 simulator that demonstrates the issue?


-        Mark

From: Simh [mailto:simh-bounces at trailing-edge.com] On Behalf Of Henry Bent
Sent: Friday, July 10, 2015 11:54 AM
To: simh at trailing-edge.com
Subject: Re: [Simh] More VAX 11/750 Testing

Just a quick update: the problem here is definitely the PCS.  When I was also having problems booting 4.3BSD, I figured out that if I remove pcs750.bin (the file that the bootloader uses for the microcode updade) then the system would boot just fine.
-Henry

On 8 July 2015 at 19:30, Henry Bent <hbent at oberlin.edu<mailto:hbent at oberlin.edu>> wrote:
First of all, thank you very much to Mark for finding and fixing the uba problem with the 750.  Glad that modern Ultrix now works on that simulator.
Now for a new 11/750 issue: Ultrix 1.1.  Before the most recent fix it didn't even attempt to boot, and I just figured that bootloader/OS support was incomplete.  Now, with the most recent fix, that turns out not to be the case.  The kernel loads but stops immediately:

sim> boot rq /r5:1
Loading boot code from vmb.exe

Boot
: ra(0,0)genvmunix
Updating 11/750 microcode ...
220688+77372+63260 start 0x1420

HALT instruction, PC: 800001E5 (HALT)
If needed, I put a mostly clean install of Ultrix 1.1 (on a 780) at http://occs.cs.oberlin.edu/~hbent/vaxultrix/ultrix11.tar.bz2 .  No root password.
On a more general note relating to Bob's recent email, I don't think I have the skills to truly adopt a machine within simh, but I can certainly do all manner of testing.  I'll try to find some time over the next few days to come up with some esoteric corner cases for the 8600 and 750.
-Henry

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