[Info-vax] VAX 6000 on Young Sheldon

[Arne Vajhøj]

On 2/11/2023 7:02 PM, Johnny Billquist wrote:
> On 2023-02-11 17:26, Arne Vajhøj wrote:
>> On 2/11/2023 11:18 AM, Tony Priborsky wrote:
>>> I'm pretty sure it didn't write a native VMS backup saveset -
>>> remember the CPU on the HSC was a PDP-11.   Logically the backup was
>>> the equivalent of VMS "BACKUP/PHYSICAL".  I seem to recall that at
>>> some point the VMS backup could restore (read) a HSC backup.
>>
>> So no CRC and no redundancy groups?
> 
> Depends on how you mean that. Tapes have CRC on the data unless I 
> remember wrong. Just like disks have.

As I remember 9 track tapes then it was pure data blocks
and tape marks - no CRC.

If mounted as labeled tape then some blocks were
considered VOL and HDR blocks, but that was an OS
feature not a drive feature.

Arne