[Info-vax] RSTS/E and VMS connection

[Dave Froble]

On 4/7/2023 6:26 PM, Arne Vajhøj wrote:
> On 4/7/2023 5:22 PM, Johnny Billquist wrote:
>> On 2023-04-07 01:02, bill wrote:
>>> WE have often heard that VMS on the VAX was the logical procession
>>> from RS11 on the PDP.  I was looking around at my bookshelf and saw
>>> my 1983-84 RSTS/E PDP-11 Operating System book and it kinda piqued
>>> my interest so I picked it up and did a  little lite reading.
>>
>> Well. Internally, VMS is like a scaled up RSX in many (most?) corners. Most
>> data structures and designs were (are) more or less the same as in RSX, but
>> scaled up for 32-bits and whatever logically came out from there. A lot of
>> system calls is the same story. And initial release of VMS mostly used all RSX
>> cusps, running in compatibility mode, and slowly getting replaced with native
>> things. Early versions of VMS I seem to remember even might still have used
>> ODS-1, or some hybrid between ODS-1 and -2. I clearly remember the 9+3
>> character filename limitation in my earliest memories of VMS.
>
> Before my time (I started with 4.4) but I thought the 9+3 to
> 39+39 change happened with VMS 3.x -> 4.0 not with ODS-1 to ODS-2?
>
> Arne

And your memory would be correct.  I started on VMS at version 2, and the 9+3 
was it at that time.


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