[Info-vax] Hard links on VMS ODS5 disks

[Fred. Zwarts]

Op 24.aug..2023 om 12:08 schreef Johnny Billquist:
> On 2023-08-23 14:35, Simon Clubley wrote:
>> On 2023-08-22, Arne Vajhøj <arne at vajhoej.dk> wrote:
>>>
>>> VAX + VMS                               Eclipse MV + AOS/VS
>>> ---------                               -------------------
>>>
>>> CISC                                    CISC
>>> 32 bit virtual byte addresses           31 bit virtual word addresses
>>> 4 GB address space                      4 GB address space
>>> 512 byte pages                          2 KB pages
>>> 16 bit compatibility mode               16 bit compatibility mode
>>> 4 modes:                                8 modes:
>>>     K (0) - VMS                             0 - kernel
>>>     E (1) - RMS & Rdb                       1 - virtual adress 
>>> translation
>>>     S (2) - DCL                             2 - unused
>>>     U (3) - application                     3 - IO buffering & 
>>> compatibility
>>>                                             4 - DG database
>>>                                             5 - Oracle database
>>>                                             6 - available for large
>>> applications
>>>                                             7 - applications
>>> memory organized:                      memory organized in 512 MB
>>> segments one per mode
>>>     P0 - heap
>>>     P1 - stack
>>>     S0 - OS
>>>     S1 - unused (early VMS)
>>> processes                               processes + threads (called 
>>> tasks)
>>> kernel in Macro-32 or Bliss             kernel in assembler
>>> utilities in Macro-32 or Bliss or HLL   utilities in Algol dialect
>>>
>>
>> Based purely on what you write above, the use of an Algol dialect for
>> writing their userland code is a _massive_ win over the DEC approach
>> and _far_ superior to the way DEC did things.
>>
>> Wish DEC had done the same.
> 
> I think when it came to utilities, very little was in Macro-32, and most 
> were in Bliss or some other HLL. Can't say that I'd consider everything 
> written in some Algol dialect to be a massive win over that.
> 
>    Johnny
> 

I remember that in very early VMS versions (1.5 or slightly later) the 
'directory' command sometimes displayed FORTRAN errors. :)