[Info-vax] VAX 6000 on Young Sheldon

[Arne Vajhøj]

On 2/12/2023 12:11 AM, Dennis Boone wrote:
>   > Hmm.  In 50+ years of data processing/IT/systems work, I've never heard of
>   > tapes having (nonprogrammatic) CRC, that is, anything generated by the
>   > hardware/firmware rather than the backup program.
> 
> Seven track tape had both frame and longitudinal parity.
> 
> Nine track had both parities, plus a crc character.  Data, three
> frame times empty, crc frame, three frame times empty, lrc, irg.
> 
> See e.g. http://bitsavers.org/pdf/kennedy/9100/Kennedy_Model_9100_192-9100-003_75ips_Operation_and_Maintenance.pdf

A quick glance indicate that this stuff is below "byte level" and down
at "electric level".

Arne