On Mar 10 2005, 20:33, Jules Richardson wrote:
>
> Just futzing around with this Manta board (SCSI floppy controller).
>
> The docs I have say that pin 2 of the floppy connector is normally
an
> input to the controller from the drive, but that some drives expect
pin
> 2 to be an output to the drive from the controller (e.g. for changing
> rotation speed on a drive capable of 300 and 360rpm)
>
> That sounds wrong to me; surely most drives either don't use pin 2
for
> anything, or they expect it to be an output from the controller (to
cope
> with things like speed changes)
Yes, but I believe some drives did use pin 2 to signal the controller
in some way. I've never (knowingly) come across one, but I'm told some
Apple drives did this.
--
Pete Peter Turnbull
Network Manager
University of York
I have all three of the service manuals for the IPC and the Service ROM.
According to the manual, when you turn the IPC on the yellow light on
the printer reset button should flash twice and then go out. Then the print
head should move to the right and then return home. Next the red lite on
the disk drive should light momentarily and the drive should click. About
three seconds later the display should light up and display "Executing the
RAM, MMU, and the short keyboard test, please stand by". Are you getting
any of those? The manual is quite clear that the most likely fault that
prevents turn on is a power supply fault. It doesn't give any information
about the display itself except for a general description (512 x256 pixels)
and that it uses 180 to 200 volts to operate and that the HV drivers are on
the driver bvoard attached to the screen. There is a description and
schematic of the Logic Board B that interfaces to the display. Mostly it
just converts the display data to a serial format and the data is sent into
the display serially and there is some fancy timing to reverse the polarity
of the high voltage on alternate screen cycles to prevent degrading the
screen.
Joe
Ij:09 AM 3/10/05 +0100, you wrote:
>I have current;ly on my bench an old HP Integral Unix luggable....
>
>Doesn't boot, powersupply seems to be OK.
>Therefore : anyone have schematics, or, more in particular, a pinout for
>the Sharp LJ512U03c EL-display, used in the Integeral ?
>
>( I did google, bitsavers and Sharp itself....)
>
>---------------------------------------------------------------------------
-----------------
>Jos Dreesen jos.dreesen at philips.com
>Philips Semiconductors , BL Cellular systems, PSZ Zurich
>Tel +41 1 465 1162
>---------------------------------------------------------------------------
------------------
>
28. Started with a Tomy Tutor and then a Commodore 64, although I'd also been
exposed to TIs and Apple IIs by this point. Developed a taste for Unix during
college (naturally, as a University of California graduate, I prefer BSD).
Most of my technical background, besides medicine, is in database
administration.
--
---------------------------------- personal: http://www.armory.com/~spectre/ --
Cameron Kaiser, Floodgap Systems Ltd * So. Calif., USA * ckaiser at floodgap.com
-- "I'd love to go out with you, but I'm in perpetual denial." ----------------
> You've got gravity. Dry sand flows pretty well. Bamboo is
> hollow and so can be used to channel dry sand around.
> Different lengths of bamboo could be used to introduce
> delays. Doubtless you could make basic logic gates.
>
> Some sort of mechanical effort would be needed to lift sand
> again in order to combat gravity pulling sand downward.
>
> Not much different from a relay computer really, I suppose.
> Just slower.
> And more sandy.
And relay computers don't like salt water, but administrators might.
Hmmm, seaside computing. I think we hit on something.
Jay West <jwest at classiccmp.org> wrote:
> One of the problems mail server admins face, are people who throw up their
> own mailserver at home. You don't have gobs of bandwidth, you don't have
> multiple backup servers, and you don't have diesel generators and online
> UPS. If you don't, you have no business running a public mailserver. Most of
> the time I see this it's because someone wants some kinda juvenile bragging
> rights about "Ohhh I run a my own K00L server". Geeze. I have seen a few
> people who do it for good reason, but, if you run a mail server you need to
> be a good net citizen about it.
Have you ever heard of the word SOVEREIGNTY? I run my own servers for
everything because I exercise my right to be totally independent from the
outside world. I'll keep running when the rest of the world explodes in
the thermonuclear holocaust.
What makes you think that you have the right to impose your elitism on the
rest of the world? Just because you are rich and snobby enough to have
gobs of bandwidth and redundant servers and all that, why in the hell should
everyone else? The Founding Fathers of ARPANET made it accessible to
everyone. I have the right to be a netizen even if my entire installation
consists of a single VAX-11/780. I *do* diligently maintain it, and it has
a very good uptime. But every Classic Computer needs hardware maintenance
occasionally, and if it is acceptable to everyone at my site to have occasional
downtime, what right do YOU have to impose on us that we have to spend millions
of dollars on redundancy that we don't need?
We are concerned with *CLASSIC* computers here. It is extremely hypocritical
of you to shut me out because I run my entire operation on CLASSIC hardware
with CLASSIC software in the CLASSIC manner, using business practices of
the CLASSIC computing era, exactly as it was done on ARPA Internet in 1980s.
Hell, I actually have more bandwidth at this facility that most ARPANET sites
had: I have 384 kbps SDSL and they only had 56 kbps. I run my VAX servers
just as diligently as UC Berkeley ran theirs, but demanding the level of
performance you are asking for is absolutely and totally outlandish,
extravagant and orders of magnitude over the threshold of socially
unacceptable.
> What does being a good net citizen admin entail?
It entails following standards. RFC 1123, Requirements for Internet Hosts,
says that you must retry mail for 4 days because the recipient has the
*RIGHT* to run a mail server that may occasionally go down for a day.
MS
I have current;ly on my bench an old HP Integral Unix luggable....
Doesn't boot, powersupply seems to be OK.
Therefore : anyone have schematics, or, more in particular, a pinout for
the Sharp LJ512U03c EL-display, used in the Integeral ?
( I did google, bitsavers and Sharp itself....)
--------------------------------------------------------------------------------------------
Jos Dreesen jos.dreesen at philips.com
Philips Semiconductors , BL Cellular systems, PSZ Zurich
Tel +41 1 465 1162
---------------------------------------------------------------------------------------------
Hi,
A friend has a ST-238R and ST-225 that came out of his XT long ago.
We're trying to figure out what the most likely controller that was
being used in the original machine so we can recover the data. It must
have been 8-bit and support RLL. The best guess I can come up with is
the WD 27X (which I used to have). Anyone else have a good guess?
I think the ST-225 came with the machine and then the ST-238R was
installed as part of a kit. So whatever controllers were usually sold
with those as a kit (i.e. from Dirt Cheap or a refurbisher) would be a
likely candidate too. For example, my 27X came with a Miniscribe 8438
kit from a refurbisher.
Thanks,
--
Ryan Underwood, <nemesis at icequake.net>
OK, thinking about getting a catweasel board for the museum.
1) What's the official homepage for the board? A google search suggested
http://www.jschoenfeld.com but that site seems horribly incomplete and
out of date.
2) Opinions of the board would be much appreciated, particularly in the
context of what it *can't* do, how easy it is to code for, how easy it
is to get hold of others' code to handle a particular format (rather
than reinventing the wheel), how well the board copes with media errors
etc.
The other option's the Torch Manta board, for which I do at least have
full schematics, PAL equations etc. - downside being that it'll only
handle FM/MFM data (and as mentioned on the list in the past, there
isn't even one particular standard of MFM).
We must have around a thousand different machines covering a *lot* of
different manufacturers, hence being able to cope with hard & soft
sectored disks and all manner of encodings is important. In a lot of
cases, getting the machines up and running might be a long-term goal, so
preservation of the media using 'alien' hardware is an issue.
cheers
Jules
First I got "just a typing unit" for an ASR-33 (thought it was going to have some more of the unit included)...not too useful, but it really sparked the bug...
Then I bought a unit and had it shipped. Poorly packed, it was virtually destroyed (ok the case was destroyed) in transit. Pictures are at www.dynamicconcepts.us/Teletype. After some re-construction, it is powered up, but I have been completely unable to get the h-plate properly aligned...
So, I wend up to Vermont [I am in NY] to pick up another teletype. This one I carefully transported back (after some disassembly), but once it was back together....you guessed it....I cant align the DA$&*#*@MN H-Plate!
I have been working on those two units off and on since before the holidays, and have become quite fustrated.
Then a teletype appeared on e-Bay, and it was local (actually between my home and work!!!)...special bonus, nobody seemed to be biddingh it up [it was listed at the same time as the infamous $1400+ unit]. I won it, and picked it up.
This time I secured the typing unit in place, AND marked the exact position of everything with a marker!
I get it home and power it up. The main cam shaft is not properly secured (the hold down just past the gear is broken)...No biggie..I have the original typing unit which can be gobbled for parts. After transfering over the assembly containing the cam holedown, I power it up again..
The keyboard works (NO H-Plate problems [yippie]), the paper tape punch worked [the reader needs to be replaced, but I have a NIB unit for that], the type cyclinder spinds and lifts, the hammer strikes...and a really faint improperly alligned imnage is all that gets printed [Yes I have a brand new ribbon on it].
So at this point, I am wondering how to address this problem...The cylinder is well cleaned (boy was there buildup), the characters look sharp on it, the rubber bumper on the hammer is in apparant good condition [and not "soft"]....
Any clues appreciated... [wishing there was a traveling teletype repairman who wanted to come to Long Island NY....]
David
On Mar 10 2005, 14:18, willisjo at zianet.com wrote:
> I did know about the serpentine weirdness. It caused me a great deal
of
> grief in getting the system to pass its self tests in the beginning,
before
> I stumbled (quite accidentally) across hamster's digital$resources
> page on Qbus. However, I think you may have hit on something. The
RQDX3 is
> not at the end of the bus.
No, it's not that...
> If memory serves (I'll verify this
> after I get home from work today), the backplane arrangement is
>something like this:
> A B C D
> +-------------------------------------+
> | CPU |
> +-------------------------------------+
> | Memory |
> +-------------------------------------+
> | TQK50* | |
> +-------------------------------------+
> | M9047 | |
> +-------------------------------------+
> | RQDX3* | |
> +-------------------------------------+
> | DHV11 |
> +-------------------------------------+
> | ???? ** |
> +-------------------------------------+
> | | |
> +-------------------------------------+
> | | |
> +-------------------------------------+
That's what's wrong. Assuming this is in a BA23, you don't have
interrupt or DMA grant continuity. The first three slots are Q22-CD
but (if this is a BA23) the fourth is Q22-Q22 so you need something in
the RHS (slots C+D) of row four:
A B C D
+-------------------------------------+
| CPU |
+-------------------------------------+
| Memory |
+-------------------------------------+
| TQK50* | |
+-------------------------------------+
| M9047 | RQDX3 |
+-------------------------------------+
| DHV11 |
That's the only reason you have a grant card; it is to sit next to a
dual-height card in a Q22-Q22 slot. If this were a BA123, you'd not
need it at all.
--
Pete Peter Turnbull
Network Manager
University of York
