[Info-vax] VAX 6000 on Young Sheldon

[Arne Vajhøj]

On 2/16/2023 2:52 PM, gah4 wrote:
> The first thing OS/360 and successors do when a tape is mounted,
> is read the label (,SL), or verify that there isn't one (,NL).
> Systems I knew would let you read, but not write, with (,BLP).
> (That is, bypass label processing.)

MOUNT /OVER=ID on VMS bypasses everything.

> The drives will read until they find either data or a tape mark, or the
> tape goes off the reel.  (The foil EOT markers are only used on writing.)
> 
> No comment on how I know that.

I remember SYS$QIOW with IO$_READLBLK. Do one
after logical end of tape and it was a runaway tape
having to wait until tape ran out.

Arne