Hi all,
A colleague and I are trying to get a VT220 working again as it recently
died on us. We are hoping to set up a few items for the mid-80s
(including this terminal) to show the graduands what it would have been
like if they were doing their CompSci degree 30 years ago.
It looks to me like t
> Hi all,
>
> A colleague and I are trying to get a VT220 working again as it recently
> died on us. We are hoping to set up a few items for the mid-80s
> (including this terminal) to show the graduands what it would have been
> like if they were doing their CompSci degree 30 years ago.
>
> It look
Thanks for the information, Peter. It makes me want to try and test a
few of the components around the flyback.
Thanks again,
Aaron.
Peter Coghlan via cctalk writes:
>> Hi all,
>>
>> A colleague and I are trying to get a VT220 working again as it recently
>> died on us. We are hoping to set up
My flatmate has one of these. Just the small subassembly with the 2
push-buttons and a red light between them. Is this something that
would be of interest to anyone? I'm trying to persuade him to eBay it
instead of throwing it away.
We've also got the plastic covers from a few disk packs, an empty
>
> Thanks for the information, Peter. It makes me want to try and test a
> few of the components around the flyback.
>
It would also be good to check the stuff like voltages on the base of the CRT
and that the CRT heater is glowing. You could have a problem that is nothing
to do with the flyback
Yes we checked for the glow. It's very dim but it is there. I will bring
one home this weekend and check some of the surrounding
components. Hopefully it is something very simple to replace. I'll have
a probe.
Thanks!
Aaron.
Peter Coghlan via cctalk writes:
>>
>> Thanks for the information, Pe
Was working on some Drives this week, and took some pictures of it disassembled.
http://bitsavers.trailing-edge.com/pdf/diablo/photos/Diablo_33F/
The prefilter was orange crumblefoam. I took a look at my NOS ones and they have
a greenish prefilter that still appears to be OK. The gasket going up t
On Fri, Apr 28, 2017 at 4:38 PM, Aaron Jackson via cctalk
wrote:
> Yes we checked for the glow. It's very dim but it is there. I will bring
What do you mean by 'very dim'? It should be a distinct orange glow,
best seen looking
up the base of the CRT.
I normally start by checking the CRT pin volt
I'll have to give mine a look. I hate that foam.
Dwight
From: cctalk on behalf of Al Kossow via cctalk
Sent: Friday, April 28, 2017 9:00:28 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Diablo 3x pictures
Was working on some Drives this wee
On Fri, Apr 28, 2017 at 5:10 PM, dwight via cctalk
wrote:
> I'll have to give mine a look. I hate that foam.
There seem to be 2 types. One turns to a sticky goo, the other turns to
dust. I refer to them both as 'Evil Foam'. I have just removed some from
the drives of an RX01 (the older drives, on
On 4/28/17 9:13 AM, Tony Duell wrote:
> On Fri, Apr 28, 2017 at 5:10 PM, dwight via cctalk
> wrote:
>> I'll have to give mine a look. I hate that foam.
>
> There seem to be 2 types. One turns to a sticky goo, the other turns to
> dust. I refer to them both as 'Evil Foam'. I have just removed so
On 04/28/2017 09:20 AM, Al Kossow via cctalk wrote:
> I wish I knew of a gasket material I could trust to survive.
> Norprene is polypropylene based, as opposed to PVC, polyurethane,
> etc.
>
> Home weather stripping is made from polyurethane.
>
> This is the stuff I'm going to try
> http://www
Hi Tony,
Thanks for the information, that is all very useful! I think I will open
up my VT420 which is working nicely to compare the glow in the base
followed by checking the voltages, as you describe.
Thanks again!
Aaron.
Tony Duell writes:
> On Fri, Apr 28, 2017 at 4:38 PM, Aaron Jackson vi
On Thu, Apr 27, 2017 at 11:17 PM, Mike Loewen via cctalk
wrote:
> On Thu, 27 Apr 2017, Ethan Dicks via cctalk wrote:
>
>> Additionally, for a testing framework to poke signals through the
>> drive for debugging during the repair...
>
>You should check out a couple of disk utility programs for
On 04/28/2017 10:01 AM, Ethan Dicks via cctalk wrote:
> So that's where I'm at - the drive was working before the power was
> jiggled and now it's not and it doesn't appear to be the
> electronics.
Make sure that the head is making good physical contact with the medium.
Sometimes the head susp
On 4/28/17 9:00 AM, Al Kossow via cctalk wrote:
> The door latch and load lamp is driving me nuts. Dug out my extender card
> this morning
> to try and figure out why the driver transistors aren't turning on.
Quick work once I could probe the IC pins.
A gate on the J2 card was always assertin
On Fri, Apr 28, 2017 at 1:18 PM, Chuck Guzis via cctalk
wrote:
> On 04/28/2017 10:01 AM, Ethan Dicks via cctalk wrote:
>
>> So that's where I'm at - the drive was working before the power was
>> jiggled and now it's not and it doesn't appear to be the
>> electronics.
>
> Make sure that the head is
> -Original Message-
> From: cctech [mailto:cctech-boun...@classiccmp.org] On Behalf Of Gregory
> Beat via cctech
> Sent: 28 April 2017 18:28
> To: cct...@classiccmp.org
> Subject: Re: Reviving VT220?
>
> For your education, Google search "Flyback transformer"
>
> There are a number of re
For your education, Google search "Flyback transformer"
There are a number of rebuilders, replacements, and substations.
B&H Electronics
https://www.bhelectronics.com/products/dc-dc-power-products/isolated-flyback-transformers.html
Pactran
http://pactran.com/why-pacific-transformer/?gclid=CNWWzL
I have most VT100 family, some VT220 and VT330 parts, including all 3
colors of new VT330 CRTs.
Please contact me off list if interested.
On Fri, Apr 28, 2017 at 7:27 AM, Peter Coghlan via cctalk <
cctalk@classiccmp.org> wrote:
> > Hi all,
> >
> > A colleague and I are trying to get a VT220 work
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