On 8/11/19 8:51 PM, Douglas Taylor via cctech wrote:
>
> The TC02 is an Emulex TS11 emulation for pertec interface tape drives.
> The J1 and J2 are sort of standard terminology, don't know why.
Ah, the *Emulex* TC02. You had me going there--DEC also has a DECtape
controller called the TC02.
On 8/11/2019 10:44 PM, Chuck Guzis via cctech wrote:
On 8/11/19 6:00 PM, Douglas Taylor via cctech wrote:
I just looked at the TC02 and the Qualstar, there are termination
resistor packs on each. The Qualstar has a bunch of 74LS240 IC's near
the J1 and J2 pertec interface cables. The TC02
On 8/11/19 6:00 PM, Douglas Taylor via cctech wrote:
> I just looked at the TC02 and the Qualstar, there are termination
> resistor packs on each. The Qualstar has a bunch of 74LS240 IC's near
> the J1 and J2 pertec interface cables. The TC02 has a bunch of 74LS374
> chips near the J1 and J2
On 8/11/2019 7:01 PM, Jon Elson via cctech wrote:
On 08/11/2019 11:11 AM, W2HX via cctech wrote:
I seem to remember they were ribbon cables
with each odd/even pair twisted which probably meant one
active and one ground twisted together.
Or differential pairs.
No, both Pertec unformatted and
On 08/11/2019 11:11 AM, W2HX via cctech wrote:
I seem to remember they were ribbon cables
with each odd/even pair twisted which probably meant one
active and one ground twisted together.
Or differential pairs.
No, both Pertec unformatted and Pertec formatted interfaces
were TTL single-ended.
On 8/11/19 2:21 PM, Warner Losh wrote:
On Sun, Aug 11, 2019, 11:29 AM Alan Perry via cctech
mailto:cctech@classiccmp.org>> wrote:
On 8/11/19 6:58 AM, Charles via cctech wrote:
> Anyway. I did a bit more Googling and discovered that plain water
> dissolves the PVA goop
On 8/11/19 9:11 AM, W2HX via cctech wrote:
>> All of my Pertec tape drives (in the past) were located in
> a differentrack from the actual computer so the cables were
> always over 10' long and usually close to if not 20'. Never
> had a problem.
I stand by my commentary re Qualstar 1xxx drives.
On 8/11/19 6:58 AM, Charles via cctech wrote:
Anyway. I did a bit more Googling and discovered that plain water
dissolves the PVA goop just fine. No need to use a lot of expensive
alcohol which seems to be a less effective solvent anyway!
Last Christmas, I removed the old PVA from a DEC
>All of my Pertec tape drives (in the past) were located in
a differentrack from the actual computer so the cables were
always over 10' long and usually close to if not 20'. Never
had a problem.
That is because a) you had the proper termination in place and b) the
signalling speed of the
On 8/11/19 9:07 AM, W2HX via cctech wrote:
>> Would folding the
> excess cable up and covering with anti-static plastic help?
>
> unlikely. The typical problem is that the longer the cable, the higher the
> capacitance of the transmission line. Therefore you get a lot of problems
> with rising
The VT20 design team was, iirc, John Kirk for the video, and me for
the Unibus interface in the first version. The one with the slick
one shown here,
http://bitsavers.org/pdf/dec/terminal/vt20/vt20_2.jpg
The /05 based package was after my time, I don't remember much about
how it was deployed.
The
> On Aug 10, 2019, at 2:56 PM, Paul Birkel via cctech
> wrote:
>
> The DEC VT20 terminal apparently included a PDP-11/05 with a direct mapped
> character display and was intended for text editing and typesetting. It
> seems to have been followed by the VT21, and then VT71/VT72, all three
On Sat, Aug 10, 2019 at 9:46 AM Douglas Taylor via cctech
wrote:
>
> I bought the long cables off ebay, so they have to be good? Right? I
> think the short cables came from a hamfest.
>
> The cables can be fairly long, I remember interfacing a TU80 to an
> Emulex QT14 (maybe) and the DEC cables
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