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 <[email protected]> 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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