looking for a 7-track reel tape controller

[Chuck Guzis]

On 8/8/19 12:25 AM, Christian Corti via cctalk wrote:
> On Wed, 7 Aug 2019, Michael Thompson wrote:
>> can be connected to both 7-track and 9-track drives. The TU20 drive on
>> the
>> PDP-9 at the RICM is a 7-track drive. The only difference between the
>> 7-track and 9-track versions of the TU20 is the tape head. All of the
>> tape
>> drive electronics is the same for both versions.
> 
> The same is true for the HP 7970B tape drives, I even have a 9-track
> 7970B that can be switched between 200, 556 and 800 bpi. I only need a
> 7-track head...

7-track density settings only really matter when writing--a 200 or 556
cpi tape can be read at 800 without problems.

--Chuck