DEC Pro operating systems and MFM emulator

Paul Koning paulkoning at
Sun Jan 24 09:38:27 CST 2021

> On Jan 23, 2021, at 4:00 PM, Cameron Kaiser <spectre at> wrote:
>>>> 2. Venix: panic at boot, "Bad access number".  That doesn't mean anything
>>>> to me.  I wonder if the issue is that Venix doesn't support the 380.
>>> The Venix image is special. Venix doesn't support more than 16 sectors
>>> per track. You may need to put it on a disk whose geometry is 16spt. Maybe
>>> that is why? Venix should support both the 350 and 380.
>> That doesn't explain it, because all hard drives on the Pro by definition
>> have 16 sectors per track.
> Venix runs fine on my 380. In fact, it's the only OS installed on it. It has
> the stock hard disk, though I'd like to convert to solid state, so I've been
> reading this thread with interest.

Interesting.  I wonder if it has to do with the peripherals I have installed.  I should try it again with the PC3XC and CNA pulled out.

What is your configuration?  Do you have EBO?  Memory size?  Option cards?


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