[Info-vax] VAX vs. MV/8000 [was Re: Hard links on VMS ODS5 disks]

[Johnny Billquist]

On 2023-08-23 04:16, Arne Vajhøj wrote:
> On 8/22/2023 9:36 PM, Rich Alderson wrote:
>> =?UTF-8?Q?Arne_Vajh=c3=b8j?= <arne at vajhoej.dk> writes:
>>> VAX + VMS                               Eclipse MV + AOS/VS
> ...>> ---------                               -------------------
> 
>>> 16 bit compatibility mode               16 bit compatibility mode
>>
>> Wrong!  See below.
> 
>> Unlike the PDP-11 mode bit in the VAX, the MV/8000 used the same 
>> method as the
>> Eclipse to add 32 bit intructions to the mix:  A previously unused set 
>> of NOPs
>> was turned into the prefixes for the 32 bit instruction set.
> 
> So you say that the Eclipse MV was "Eclipse compatible" instead
> of having "Eclipse compatibility mode"?

I think there was a famous quote about this:
"We will *not* have a compatibility mode bit like the VAX did!".

   Johnny