[Info-vax] Backup TK50 tapes

[Johnny Billquist]

On 2013-02-25 21:27, glen herrmannsfeldt wrote:
> Paul Sture <nospam at sture.ch> wrote:
>> In article <kgfcuq$9f1$1 at Iltempo.Update.UU.SE>,
>> Johnny Billquist <bqt at softjar.se> wrote:
>
>>> Actually, I think for most hardware, the limit is actually 64k
>>> for one read.
>
> I have read/written 100K on unix 9track drives.

What system?

>> I believe that is correct.  However I purposely restricted VMS backup
>> tapes to a maximum of 32K because that meant I could copy savesets to
>> disk.
>
> Is that a VMS limit or DEC hardware limit?

If the 32K really is a limit, I believe it would be in VMS, in treating 
a 16-bit number as signed here.
The controllers that I know by DEC have 16 bit fields for record lengths 
in hardware, but it is unsigned.

	Johnny

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol