18 May
2014
18 May
'14
10:05 p.m.
Date: Sat, 17 May 2014 18:38:02 +0200
From: Marco Rauhut <marco at familie-rauhut.eu>
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at classiccmp.org>
Subject: Re: DEC TU56 dual drive and it's modules
Message-ID: <5377906A.8060909 at familie-rauhut.eu>
Content-Type: text/plain; charset=ISO-8859-15; format=flowed
The tip with the look on the wiering of the backplane bring "light" into
the darknes.
Now the most Modules in right placees....
Only two module places left for confirmation.
Thanks to all so much!
Am 16.05.2014 22:33, schrieb Tony Duell:
This may have been mentioned and I missed it, but just in case: if the
drive unit was connected to a TCxx (typically a TC08) then it will not have
the G888s in its backplane. I believe you stated you want to connect this
to a TD8E, in which case you need the G888s. I'm sorry to say, they are
quite hard to find and when you do find them (quantity 5), you will pay
dearly for them. That's been my experience - I have a TU56 that's been
languishing while I try to locate G888s for less than a mortgage payment.
Also, in case you haven't noticed this already: the TU56 has an internal
power supply that runs the motors and some of the control circuits, but
also requires an external supply for the logic. -- Ian
--
Ian S. King, MSIS, MSCS
Ph.D. Candidate
The Information School
University of Washington
Madness takes its toll - please have exact change.
> In the engeneering drawings "Module
Utilization" are shown special
> places for each module. In my drive the Modules on different places then
> in the drawing.
> Is the backplane a real bussystem or got i use the ports shown in
drawings?
The T56 is most definitely not a bused backplane, the modules have to be
in the right slots.
I think exacltly which modules you need depeends on the controlleryou are
uisng it with. So you might need ot check that.
And DEC often drew the modual utilisation diagram looking a the _wiring_
side of the backpl;ane, not at the modules. It's a mirror image of what
you might expect.
-tony
19 May
19 May
7:15 a.m.
I have the needed G888 moudules.
And i know about the external power supply. But i do. Not have the H716. In this reason i
powered the device from the second Outlet on the PDP-8e' s h724. The drive need 500mA
at 5v and also 500mA at -15v. Because i have only one backplane in the PDP-8 i think this
is no problem for the supply.
Marco
Am 18.05.2014 um 22:05 schrieb "Ian S. King" <isking at uw.edu>:
Date: Sat, 17 May 2014 18:38:02 +0200
From: Marco Rauhut <marco at familie-rauhut.eu>
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at classiccmp.org>
Subject: Re: DEC TU56 dual drive and it's modules
Message-ID: <5377906A.8060909 at familie-rauhut.eu>
Content-Type: text/plain; charset=ISO-8859-15; format=flowed
The tip with the look on the wiering of the backplane bring "light" into
the darknes.
Now the most Modules in right placees....
Only two module places left for confirmation.
Thanks to all so much!
Am 16.05.2014 22:33, schrieb Tony Duell:
This may have been mentioned and I missed it, but just in case: if the
drive unit was connected to a TCxx (typically a TC08) then it will not have
the G888s in its backplane. I believe you stated you want to connect this
to a TD8E, in which case you need the G888s. I'm sorry to say, they are
quite hard to find and when you do find them (quantity 5), you will pay
dearly for them. That's been my experience - I have a TU56 that's been
languishing while I try to locate G888s for less than a mortgage payment.
Also, in case you haven't noticed this already: the TU56 has an internal
power supply that runs the motors and some of the control circuits, but
also requires an external supply for the logic. -- Ian
--
Ian S. King, MSIS, MSCS
Ph.D. Candidate
The Information School
University of Washington
Madness takes its toll - please have exact change. > In the engeneering drawings "Module
Utilization" are shown special
> places for each module. In my drive the Modules on different places then
> in the drawing.
> Is the backplane a real bussystem or got i use the ports shown in
drawings?
>
> The T56 is most definitely not a bused backplane, the modules have to be
> in the right slots.
>
> I think exacltly which modules you need depeends on the controlleryou are
> uisng it with. So you might need ot check that.
>
> And DEC often drew the modual utilisation diagram looking a the _wiring_
> side of the backpl;ane, not at the modules. It's a mirror image of what
> you might expect.
>
> -tony 
20 May
20 May
6 a.m.
While I don't know if this is actually useful information
as I have not attempted to build any (yet), but this site
has information on a replacement G888 board:
http://svn.so-much-stuff.com/svn/trunk/Eagle/projects/DEC/Gxxx/G888/
If anyone gets around to making some of the these before I
do, please let me know. I would be interested in the results
and some bare boards.
--tom
On 5/18/14, 3:05 PM, Ian S. King wrote:
Date: Sat, 17 May 2014 18:38:02 +0200
From: Marco Rauhut <marco at familie-rauhut.eu>
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at classiccmp.org>
Subject: Re: DEC TU56 dual drive and it's modules
Message-ID: <5377906A.8060909 at familie-rauhut.eu>
Content-Type: text/plain; charset=ISO-8859-15; format=flowed
The tip with the look on the wiering of the backplane bring "light" into
the darknes.
Now the most Modules in right placees....
Only two module places left for confirmation.
Thanks to all so much!
Am 16.05.2014 22:33, schrieb Tony Duell:
This may have been mentioned and I missed it, but just in case: if the
drive unit was connected to a TCxx (typically a TC08) then it will not have
the G888s in its backplane. I believe you stated you want to connect this
to a TD8E, in which case you need the G888s. I'm sorry to say, they are
quite hard to find and when you do find them (quantity 5), you will pay
dearly for them. That's been my experience - I have a TU56 that's been
languishing while I try to locate G888s for less than a mortgage payment.
Also, in case you haven't noticed this already: the TU56 has an internal
power supply that runs the motors and some of the control circuits, but
also requires an external supply for the logic. -- Ian
> In the engeneering drawings "Module
Utilization" are shown special
> places for each module. In my drive the Modules on different places then
> in the drawing.
> Is the backplane a real bussystem or got i use the ports shown in
drawings?
The T56 is most definitely not a bused backplane, the modules have to be
in the right slots.
I think exacltly which modules you need depeends on the controlleryou are
uisng it with. So you might need ot check that.
And DEC often drew the modual utilisation diagram looking a the _wiring_
side of the backpl;ane, not at the modules. It's a mirror image of what
you might expect.
-tony
8:55 a.m.
From: Tom Uban: Monday, May 19, 2014 9:00 PM
While I don't know if this is actually useful
information
as I have not attempted to build any (yet), but this site
has information on a replacement G888 board:
http://svn.so-much-stuff.com/svn/trunk/Eagle/projects/DEC/Gxxx/G888/
If anyone gets around to making some of the these before I
do, please let me know. I would be interested in the results
and some bare boards.
Those drawings are some of my early work, and there's a fair
amount that's sub-optimal about them. At the least, they are
totally untested.
These days, my methodology is to do "replica" boards first,
mimicing the DEC layout as closely as possible, *then* work on
the substitution of modern parts. This catches a lot more
errors, and also results in the use of better design rules, etc.
Let me know if you need to build boards anytime soon, and
I'll work on updating the CAD drawings. (Otherwise it will likely
be months before I get to it.)
Vince
4008
days inactive
4010
days old
3 comments
4 participants
participants (4)
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isking＠uw.edu -
marco＠familie-rauhut.eu -
uban＠ubanproductions.com -
vrs＠msn.com