So, does anyone know how to take an RA81 on slides _out_ of the cabinet? The
manual gives a lot of directions on how to _install_ it, but nothing on how to
_remove_ one once one has it in.
I had to take a pair of RA81's out of some cabinets, and I could not for the
life of me find the trick! I finally resorted to undoing the two machine
screws that hold the slides onto the RA81 case, which I consider sort of
cheating (although from looking at that manual, that may be the correct,
official way...)
Noel
> From: Mike Loewen
> He's been trying to sell that for months.
Mmm. Didn't know that. I just passed the URL along because it seemed like a
not totally unreasonable price for what's there (seems to be quite a few
boards, no idea if it's a complete board set) - older minicomputers seem to
be going for $1-2K in open auctions (the last two PDP-8's both went for $2K).
Noel
Hi,
I pulled my tek4015-1 from storage (~10 years, dry but cold, had been
working perfectly then) and brought it home to my living room, much to the
dismay of my significant other. I plugged it in. it squealed a bit,
zapped a little and lit up with that signature green expanding circle. I
was able to get the line/local light to behave reasonably and it seemed to
go into local mode ok. Was hoping to echo characters to the screen, but no
love.
The screen is really bright. It's as if the whole thing was in the
lit-up state. PAGE key does blink the screen, but I remember it flashing
brightly whilst erasing in the past. Now it looks like it's just staying
bright all the time. I wiggled the boards in the cage around and managed
to get it to repeat control-g feeps (while holding those keys down), but
it's only able to do it intermittently, seems related to the positioning
(or complete absence) of the display driver board. Still no characters
showing up.
Does anyone know how to work on these?
thx
jake
> From: Paul Birkel
> Wire Lists for any/all of the following:
>
> KB11-C 11/70 Processor (or the older KB11-B)
> FP11-C 11/70 Floating-point processor (or the older FP11-B, also used
> in 11/45 and 11/50)
> RH70 MASSBUS controller
I don't know for sure about the 11/70 (I never looked at one closely), but
for the 11/45 FPP, IIRC that was part of an integral multi-unit backplane
assembly with the CPU, i.e. it was wired as part of a large wire mat that
included the wiring for the CPU. So I don't think there's a separate wire
list for the FPP. I would guess the same is true of the RH70.
DEC generally included the wire lists in the engineering drawings; do the
11/70 prints not include the wire list?
Noel
All;
I'm hoping that someone here has a back-room shoebox of DEC microfiche (or
even hardcopy!) that includes Wire Lists for any/all of the following:
KB11-C 11/70 Processor (or the older KB11-B)
FP11-C 11/70 Floating-point processor (or the older FP11-B, also used
in 11/45 and 11/50)
RH70 MASSBUS controller
MJ11-A Core memory
I'd like to get these scanned and into Bitsavers. Please contact me off
list, soonest, if you think that you can help me out.
I'd be _very_ much obliged. Thanks,
paul
[PS: Of course, if they are already online somewhere that I've overlooked,
or simply already-digital but not online, please educate me further :->.]
I?m in the process of building another HP2000/Access TSB system. I pulled a
7970E tape drive out of a shipping container (I had not opened the shipping
container since I bought it about 8 years ago). When I got the unit on the
bench to give it a going over, while it looked pristine ? someone had
dropped something very heavy (heavy enough to severely deform ?? steel) on
the top of the unit.
My thought (given there?s not a shortage of open space inside the chassis)
was to put a car jack inside and jack it up thus pushing out the top. My
concern there was that there would be an ?equal and opposite reaction?).
Perhaps a 2x4 that goes side to side under the jack would alleviate this.
But on freenode #classiccmp (where I hang out pretty much every night),
PJustice and Sark both had similar ideas for an alternative approach that
took advantage of the fact that the top of the chassis has a lot of vent
holes on top. I implemented their approach and it worked very well so I
thought I?d document it with pictures and post here. I should note that this
approach only works because the angle iron I used was 14ga. Anything less
would just bend itself.
If I had facilities to cut the angle iron, I would have put a piece on top
and on the bottom but I don?t. Failing that, I just had to pick specific
spots on top to ?pull out? more carefully. As you know when steel bends it
stretches so it would be impossible to get it back 100% perfect but I?m
pretty pleased with the results. If you want to use this method and don?t
have convenient holes already present from the manufacturer, you could
always drill one or two holes to make it work. Note that without the wood
blocks you can pull it straight but it might bend back (albeit less so), but
with the wood blocks you can pull it further than straight so it bounces
back ?mostly straight?.
http://www.ezwind.net/hp2000/7970E/
And if you want to follow the build of the 2000/Access IO-rack (which holds
tape, terminal controller and bulkhead, and disk controller subsystem):
http://www.ezwind.net/hp2000/IO-Rack/
THANKS SARK AND PJUSTICE J
J
Actually I need to learn more about this. What do they exactly do when they "palletize" things? Does that include wrapping/protecting the item and lifting/anchoring it on the pallet? How small and how large an item can they deal with? How much does the service cost? How do you "unpalletize it" at the other end? Do you need a forklift or a hydraulic pallet moving thingy on the receiving end?
Marc
>> On 01/17/2015 11:09 AM, Noel Chiappa wrote:
>> I know palletization's not cheap
I haven't ever played with official Sugru, but how does it differ
>from ordinary relatively inexpensive Shoe Goo? Is Sugru like
slightly dried-out Shoe Goo? I find that a tube of Shoe Goo
dries out a bit after a few years and becomes a more easily worked
substance.
- John
The discussion about servos on the XT2190 prompted me to turn on a machine (Altos ACS 68000) that I have with one of these nice drives in it.? The initial sounds of the drive is it re-calibrating using a stepping sequence.? This may be done by the drive controller to find track zero, or the drive itself (I really don't know).? Since the stepping (and subsequent servo lock) happens at a low frequency, it is the sound you hear.? Sometimes it takes a couple of times to get its act together, but it works well.? This was a machine that had been off for a bunch of years (over 10?) and it came back to life nicely.? I couldn't say much about the terminal I had attached as the dust that had accumulated made some keys not function so well, but I'll take some canned air and "blow it out" to get it working well.
I note that the MFM interface does not have any "microstep" capability, only a simple step function.? I believe that the SMD interface did (it has been a few years, I never used it in my work), and the ESDI might (I never worked with that one).
Soon I'll get the MFM drive simulator working and go "solid state".
