[Info-vax] RSTS/E and VMS connection

[Arne Vajhøj]

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