Tape reading question

[Patrick Finnegan]

Ah, interesting.

I've got a drives, but bad rollers (and one burned out EOT lamp to replace,
which is annoying but should be easy enough).

Any suggestions on sizes for the rollers? I have one that is starting to
go, and the other one is goo already.  I can probably guess at sizes but I
thought I should ask first.

I did think it's interesting that they used a SIO/2 in the system to read
the tape.  I think I realized it was 4 track NRZI encoded from the GEI
manual, but didn't realise that (older) QIC wasn't.

Patrick Finnegan

On Mon, Mar 11, 2019, 13:32 Al Kossow via cctalk <cctalk at classiccmp.org>
wrote:

> If you open it up, it should have a DEI tape drive in it, which predates
> QIC
> The data coming off the tape is NRZ instead of GCR
>
> I just double-checked and the drive pinouts match the DEI CMTD-3400 manual
> I know, it isn't obvious at all from the maint manual..
>
> This is a problem for a bunch of systems built in the early 80's (Zilog,
> Onyx, etc)
>
> I have a stack of tapes in the queue (incl an 816 tubodos tape) for me to
> get fixed-head 4 track reading working
>
>
>
> On 3/11/19 10:19 AM, Patrick Finnegan wrote:
> > Really? They're DC300 cartridges.
> >
> > On Mon, Mar 11, 2019 at 1:16 PM Al Kossow via cctalk <
> cctalk at classiccmp.org <mailto:cctalk at classiccmp.org>> wrote:
> >
> >
> >
> >     On 3/10/19 7:48 PM, Patrick Finnegan via cctalk wrote:
> >
> >     > One has the TurboDOS backup/install media for a Televideo TS-816
> that I got
> >     > from Don Maslin back in the day. I think the other one is related
> too, but
> >     > it was unmarked.
> >     >
> >
> >     TS-816 tapes aren't QIC
> >
>
>