DEC Pro operating systems and MFM emulator

Paul Koning paulkoning at
Sun Jan 24 13:43:07 CST 2021

> On Jan 24, 2021, at 11:54 AM, Warner Losh via cctalk <cctalk at> wrote:
> On Sun, Jan 24, 2021 at 9:53 AM Cameron Kaiser via cctalk <
> cctalk 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.
>> [...]
>>>> 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?
>> It's a pretty vanilla 380. I think it has just the 256K. No EBO, no option
>> cards. RD52-A and RX50-AA.
>> Note that I can't exclude that it has a 380-specific Venix installed; it
>> came
>> to me with it and I don't have floppies (part of why I'd like to convert
>> it).
>> But I don't recall Venix coming in a 380-specific version.
> The Venix/Pro that's in the archives works on all Pros (1.0) but 2.0
> requires the 380.

That's odd.  The image I tried is "venix2" from the Xhomer website.  From the name I'd guess that is V2.0, but it runs fine on Xhomer which is a 350 emulation.  On the other hand, it panics (as I reported) on my Pro 380.


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