MicroVAX I Diagnostic floppies

Josh Dersch derschjo at gmail.com
Tue Dec 19 12:59:25 CST 2017

Well, that figures.  Found them here, for future reference:


- Josh

On Tue, Dec 19, 2017 at 10:50 AM, Josh Dersch <derschjo at gmail.com> wrote:

> Hi all --
> I'm attempting to resurrect a MicroVAX I (because it's there, that's why)
> and the CPU appears to have developed a fault.  Microverify passes at
> powerup, but I can't get VMS to boot (it dies with a SYSBOOT-F-Unexpected
> Machine Check almost immediately).  Also tried Ultrix and it dies shortly
> after enumerating disks.  I know the memory and disk controllers are fine,
> and there's nothing else in the system at the moment, so unless anyone has
> any bright ideas, I think I'm going to need to debug the CPU.
> I'm trying to track down the diagnostics for this machine, no luck so
> far.  Anyone have a copy sitting around somewhere?  I believe there were
> two RX50 floppies for this purpose, DEC part numbers BL-T856A-DE and
> BL-T857A-DE.
> Thanks as always,
> Josh

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