Well, it would be a very nice thing to put the hands on a copy of such
Given that I didn't find ANY information on Google about these boards,
except for the bare description in the PDP11 field guide, it would be very
nice to archive a copy on bitsavers too...
If you manage to find something, please let me know
>I've got a photocopied user's manual in this mess somewhere (used for the
"VR:" VT30 emulation in E11).
Hi, all, I have a Heathkit TC-3 tube checker, including manual and prints,
available. Image here:
It has been modified with an after-market Coletronics panel with a bunch of
additional tube bases.
Condition is unknown; it probably hasn't been powered on in some years. It was
in my wife's father's basement, so it was in a cool, dry space, at least.
I know this isn't the best list for this, but I'm not on those lists; can
people here who are, please forward it to those lists?
Any interest, reply to me only, please - no need to litter the list!
Just a quick note to thank the cc forum for providing a platform to
publicize our needs in an (nostalgic?) attempt to re-create a Data
General Eclipse and Nova environment that we used for a number of
years, over 40 years ago, in what I thought might well be a fruitless
endeavor. Were it not for this forum, and in particular the generous
assistance of Mr.Jay Jaeger of Wisconsin, the project would have never
gotten off the ground. As it is, progress is now in store! Gratefully,
Roger H. Anderson Endwell NY
I have been on the lookout for software for an emulator of MU5 that I am
building. Manchester University has found a disk pack that is promisingly
labelled. The disk pack has been provisionally identified as an ICL EDS8,
apparently compatible with an IBM 2311 and with the mechanical assembly
based on a CDC 9450.
The University has asked The National Museum of Computing (TNMOC) is they
have a drive that could read this disk pack, but it seems that although they
have such a drive, they have no plans to restore it.
Does anyone know of a working drive that might be able to read this pack?
given recent posts about Unibus graphic systems, I'm coming back with a
was anyone some documentation about board sets VT30-H and VTV30-J?
They should be graphic systems as well, the former Unibus, the latter Qbus.
Definitely I think they aren't "regular" DEC products, maybe they were
developed by third parties, as the PCB realization and style is far from
I think they are really hard to find parts, would like to try to do
something with it.
Analog, which is my nemesis, curses me again.
I have a cute idea for a cassette port project for the Tandy line of
computers (the ones with the cassette port). I have a Coco 3 on the
bench, so I scoped the output line while doing 'csave "jim"'. The
signal looks to be just under 1V PtP (0-1V on the scope), and rests at
about .3V when not sending data.
I have tried 6 different ways to boost the signal to 5V digital, to no
avail, and so I ask humbly if someone with analog knowledge might be
able to assist.
I first tried to boost the signal with a transistor (with variations
using a N channel FET as well). Arguably, that was foolhardy, and it did
My second attempt was based on this link that was shared with me:
The output from the Coco3 does not appear to be "loud" enough to work
with this circuit.
So, I finally decided a comparator solution would be required.
First, I tried a design using a 741 op-amp, which failed miserably, but
probably would have worked, but I tried to merge the design from the
Coco1, and replace the LM339 in the Coco 1 design with the 741, and I
feel I did not merge the designs well :-)
I then tried using the comparator in an Atmel AVR, and had minimal
success. By biasing one input via a variable resistor to around .8V, I
was able to get a digital stream, but it did not look like the data
stream of the cassette format.
I then pried an LM339 out of my Coco1 and replicated the circuit int the
Coco 1, as noted in the tech manual:
Color Computer Technical Reference Manual (Tandy).pdf
I was shocked that I had no success with that design at all. I assumed
(wrongly, it appears) that the Coco cassette input circuit would read
the output of it's output circuit. Beyond the possibility that my
components are defective or I wired it up wrongly, I can only theorize
that Tandy assumed that all tape recorders would AGC the output and then
feed a 2V PtP signal back to the Coco (the Coco 1 circuit looks to bias
the comparator at 1.05V (not sure about the feedback resistor's impact))
I can fiddle around with the AVR solution, which might work if I can
smooth out the spikes and bias the comparator right, but it just bothers
me that the Coco 1 circuit does not work, as I assumed I would at least
have success by copying a working design.
brain at jbrain.comwww.jbrain.com
actually when it all shows up as cc talk as the sender it is of value
as we can clear the group of mail faster after I have picked out the
topics relative to what we are working on.
In a message dated 3/1/2017 2:47:11 A.M. US Mountain Standard Time,
cctalk at classiccmp.org writes:
On 28 February 2017 at 21:23, Rich Alderson via cctalk <
cctalk at classiccmp.org> wrote:
> OK, it's official. I rarely criticize mail interfaces, because they're
> mostly innocuous. However, today's change makes life a lot more
> In the past, it was simple to direct a reply to an individual instead of
> to the
> list because the originator's address was right there in the From:
> header. As
> of today, the list address is substituted for that, so that it is
> impossible to
> respond privately...
Yoyodyne Propulsion Systems: "The Future Begins Tomorrow"
Visit us at: http://www.yoyodyne-propulsion.net
"When a true genius appears in the world, you may know him by this sign,
that the dunces are all in confederacy against him." -- Jonathan Swift
On Wed, 1 Mar 2017 cctalk-request at classiccmp.org wrote:
> Message: 17
> Date: Tue, 28 Feb 2017 20:10:33 +0100
> From: Lars Brinkhoff <lars at nocrew.org>
> To: Mattias Engdeg?rd <mattiase at acm.org>
> Subject: Re: DEC VT100/220 line wrapping semantics sought
> Mattias Engdeg?rd wrote:
> > Data for VT100, VT220 and VT510 have been collected, as well as
> > several emulators
> > (https://github.com/mattiase/wraptest/blob/master/results.txt). If
> > anyone has access to other working terminals, VT3xx/VT4xx in
> > particular, I'd be most grateful if you would take a few minutes to
> > run the test program.
> I have a VT420 set up for my kid to play with. I'll borrow it and
> submit a pull request with the results.
I have a VT525 in my home office that I use to read the mail (including
this and other mailing lists) when I don't want to fire up a workstation.
(It's quick, simple, and I get check/send a message without much fuss).
Would results from that terminal help?