Conrac mainly made CRT monitor assemblies, so the actual terminal was quite
possibly made by someone else.

It looks vaguely familiar; I'm surprised no one's recognized it.

m

On Thu, Jul 6, 2023 at 6:13 PM Brad H via cctalk <cctalk@classiccmp.org>
wrote:

> Thanks Rod!
>
> I discovered an immediate problem I hadn't caught before.. two of the
> trimmer resistors had actually been broken right off two of their legs.. so
> that may account for strange/missing voltages.   They are a CONRAC part
> 928237.  The CRT is CONRAC too, but I still don't think this is a CONRAC
> terminal.  Anyway, I only found one source for the exact resistor, an
> aerospace company, and they want $80 per unit (I think they just want me to
> go away).
>
> So far in testing I haven't found any shorts.  My main worry is the PSU
> sending incorrect voltages to wrong place.  In addition to the broken
> resistors I also discovered some broken solder joints on the PSU PCB..
> those at least are repaired.  I'm trying to figure out the resistance the
> two resistors were set to so I can put a replacement in with same,
> hopefully that gets me close to what should be there.
>
> Brad
>
> -----Original Message-----
> From: Rod Smallwood via cctalk <cctalk@classiccmp.org>
> Sent: Wednesday, July 5, 2023 8:48 AM
> To: Douglas Taylor via cctalk <cctalk@classiccmp.org>
> Cc: Rod Smallwood <rodsmallwoo...@btinternet.com>
> Subject: [cctalk] Re: 1974 No Name Terminal
>
> I worked on VDU's as an engineer in the UK before joining DEC to sell
> volume VT100's in 1975
>
> There's a mention of block on one of the cards so a block mode terminal.
>
> That means enter data and press a key to send the lot.
>
> The card cage could mean its emulating something.
>
> I'd test as many capacitors as possible. PSU first and replace as required.
>
> Run PSU and check voltages.
>
>   Check each board for power rail to ground shorts.
>
>   If ok give each board +5v on its own and see if the TTL is alive.
>
> If theres a clock gen start there (look for a crystal can)
>
>   Loads of fans might indicate an industrial environment
>
>    At this age some TTL will have failed plus capacitors.
>
>   Rod Smallwood
>
>
> On 05/07/2023 16:28, Douglas Taylor via cctalk wrote:
> > At first glance it reminded me of the Hazeltine 1000, I owned one in
> > the early 1980's.  Brutally simple terminals, I remember getting a ROM
> > from Jameco which allowed the terminal to display lowercase letters.
> > Pure luxury.
> > Doug
> >
> > On 7/4/2023 6:57 PM, Brad H via cctalk wrote:
> >> Hi there - not sure how much overlap there is with vcfed's forum, but
> >> thought I would reach out here in case.  I have a terminal from 1974
> >> (based on date codes I've found on the motherboard).  I'm unable to
> >> determine manufacturer and that would be handy for diagnostic
> >> purposes. The terminal casing is made out of foam, and although there
> >> are some serial numbers stamped around, nothing really lines up.  The
> >> fans inside have zero dust or dirt, so I'm thinking this may not have
> >> seen much use, or may be a prototype or pilot for something.  It does
> >> have RS232 capability. Interestingly the screen is set down below the
> >> keyboard so that only half of it is visible.
> >>
> >>
> >> My main issue right now is the PSU - I am trying to determine if I'm
> >> safe to attempt powering up the board (the PSU so far seems to be ok,
> >> although some voltages on a couple of pins are mysterious).
> >>
> >>
> >> Anyway, on the extremely off chance anyone has ever seen one of these
> >> or something like it.. any tips would be appreciated. If I can find a
> >> manual I'll feel a lot safer about turning it on.
> >>
> >>
> >> Some pics here:
> >> https://drive.google.com/drive/folders/1-2uEFbi3OKBYr06y6yHnygDiLMtw2
> >> Qkj?usp
> >>
> >> =sharing
> >>
> >>
> >> Brad
> >>
> >> b...@techtimetraveller.com
> >>
> >>
> >
>
>

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