Hi, has anyone experienced a condition in a pc power supply that would
intermittently put out a high enough voltage to zap the hard drive?
Regards
Charlie Fox
Charles E. Fox Video Production
793 Argyle Rd.
Windsor Ontario Canada N8Y 3J8
519-254-4991 foxvideo(a)wincom.net
Check out the "Camcorder Kindergarten"
at http://chasfoxvideo.com
>Were there some that were individually, personally signed?
>Were all Mac plus delivered with these mass produced signatures?
>Or were only some delivered with these mass produced signatures?
>If these mass produced signatures were only on some Macs,
>approximately how many were supposed to have these signatures?
All Mac Pluses have those signatures.
In fact all Mac's starting from the first (128, but before it was called
that), thru the SE have signatures. And, I believe all the IIs, and some
of the IIx's, and maybe others. I'm not as positive at what point in the
II line it stopped, and I know it stopped somewhere midline with a model,
so there is at least one model that has sigs, but not in all of them.
So people that sell their 128, 512, Plus, or SE with "signatures" are
either ignorant, or trying to jack up the price hoping to catch other
ignorant people.
-chris
<http://www.mythtech.net>
Having (almost) survived the traditional end-of-the-year cleaning and
general re-shuffling... I'm preparing some more things to place in the
'Garage, Garage Sale' and wanted to check something.
Knowing that I'm hopeless in keeping track of such things...
Has everyone who had purchased something from the Garage Sale so far
received their item(s)?
If not, please drop me a note and I'll try to get it out ASAP. (I'm such
a space case)
Thanks;
-jim
---
jimw(a)agora.rdrop.com
The Computer Garage - http://www.rdrop.com/~jimw
On Thu, 12 Dec 2002 ard(a)p850ug1.demon.co.uk (Tony Duell) wrote:
> > Huh? No. Actually, the data track itself is used as the servo signal. The
> > head centers in on the track by centering on where the amplitude is
> > strongest.
>
> Do you have any evidence for that?
Yup. I quote:
"1.3.3.2 Sector Format - As shown in Figure 1-3, each sector contains:
* Servo information for head positioning
* Head (address) information
* Data - 128 words of 16 bits each, or
256 bytes of 8 bits each, or
170 words of 12 bits each
Only the data portion can be written by the user. The servo and header
information is protected by the drive logic and controller to ensure disk
integrity and cannot be written in the field.
Each sector starts with a sector pulse that is produced by a sector
transducer mounted on the drive unit. It senses the sector notches that
are machined into the hub of the disk cartridge.
During the time that sector notch passes by the sector transducer, the
heads detect two servo pulse bursts (S1 and S2) that are prerecorded on
the platter. These servo bursts are used by the drive logic for head
positioning."
Seems like there shouldn't be any argument about this. The RL drives have
the servo information embedded in the normal track.
> > seek to a track, you check the current track, calculate the track delta,
> > and request that of the drive. When the drive report ready you once again
> > check the track to see which one you actually are on. Hopefully it is the
> > right, but if not, do another seek.
>
> Incidentally, every drive I've ever worked on records the current track
> number in the header. Even drives (like the RK's) where you can command
> the drive to move to a given track. It is possible for the drive to get
> confused and think the heads are on a different track to the one that
> they actually are on. It's better to do a restore (seek to track 0 --
> something that is detected by a separate sensor) and re-seek to the
> desired track than to overwrite the wrong sector.
Eh. This is on most controller not something you check or take care about
in software, but hardware. When you specify to the controller (for
instance en RK11) that you want track 10, it both figures out how many
tracks the heads need to move, and in which direction. It then checks that
you really are at the right track, otherwise you get an error back.
The RL11 have no such sophistication. You request a head move, and the
drive hopefully does it, and then you can carry on with the next
command. There is no checking at all in hardware, except for moving
outside the data area, which just stops the heads at the end.
> > Correctly position the heads when you don't have a servo track, and the
> > heads are actuated by voice coils, means you cannot position the heads at
> > all.
>
> You _can_, but you need a specially-modified drive. You can't use the
> off-disk signals for position feedback. Instead you have to couple up
> some other kind of transducer to the positioner and use that. An optical
> interfereometertype thingy is the normal thing to use I believe.
Sounds like a probable setup, yes.
> Incidentally, RL's don't use a voice coil. It's a little DC motor and
> pulley mechanism.
Hmmm. I'm pretty sure it's voice coil. You want me to dig out that manual
too? :-)
I could also open up one of the many drives I have around me. The only
pulley I've ever seen is for the spindle. And one have even trashed on me.
> > Which no RL01/RL02 controller can do. There is no function to write sector
> > headers. So, in addition to finding another drive to be able to position
> > the heads, you need another controller, to be able to write the data.
>
> Getting round this is the easy part once you've got the drive to keep the
> heads in the right place. The RL controller is conceptually simple (and
> as you're only _writing_, you'd not need to bother with the PLL (used to
> produce a read clock) on the homebrew header-writter.
Well, now that I've pointed out that the servo information is also
expected to show up, and that the drive checks that, and the rest of the
information is constantly checked by the controller, it should be
appearant that it's not that easy. While the RL controller might be
conceptually easy, it's a rather complex thing as stuff normally done by
the drive on other subsystems are actually done by the controller here.
Basically, if you don't have the servo information correct on the platter,
the drive will signal errors to the controller, and the controller which
just miserably fail unless header infomration keep coming in when the
drive is running.
Johnny
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt(a)update.uu.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
I found paw prints, likely that of a ferile feline, outside my door, in
the snow.
-----Original Message-----
From: Jerome H. Fine
Sent: Sat 12/28/2002 3:36 PM
To: cctalk(a)classiccmp.org
Cc:
Subject: Re: DEC 11/03 on eBay
>John Lawson wrote:
> > On Sat, 28 Dec 2002, Jerome H. Fine wrote:
> > Seller also seems to has used an out-of-focus set of shots
to blur
> > any damage.
> Gee, Jerry, I dunno... the cat seemed pretty sharp to
me.... ;)
> John
Jerome Fine replies:
I don't normally reply to the banter, but in regard to the cat?
A cat that looks almost identical "ADOPTED" my wife about
3 years ago. She is a stray and stays out almost all summer
in Toronto when it is warm. In the winter, right now there is
about 2" of snow on the ground (Toronto does NOT get the
snow storms that Buffalo gets), so she only goes out for an
hour or two each day - 15 minutes at a time. She hates being
cold. Every time the door bell rings, she runs upstairs and
hides under the bed - when she is already inside - obviously.
As for her claws - they are VERY, VERY SHARP!! She
needs them to climb the trees and the fence. And her teeth are
just as sharp.
YES!! I admit that I also love her very much.
Sincerely yours,
Jerome Fine
--
If you attempted to send a reply and the original e-mail
address has been discontinued due a high volume of junk
e-mail, then the semi-permanent e-mail address can be
obtained by replacing the four characters preceding the
'at' with the four digits of the current year.
Found a disk case at the thrift store that claims to contain the system
software for a Xerox Memorywriter 630. Contains four 5.25" floppys marked
as follows:
white XEROX 630 Memorywriter label, blank, non-write-protected
green XEROX 630 Memorywriter label, `Base System', `REORDER NO. 9R23303
VERSION 6.0 3Q85-B', write-protected
blue XEROX 630 Memorywriter label, `Options', `REORDER NO. 9R23302 VERSION
4.0 1Q85-B', write-protected
pink XEROX 630 Memorywriter label, `Forms', `REORDER NO. 9R23301 VERSION 3.0
1Q85-B', write-protected
also 2 each spare pink & blue labels w/o the version, etc. info.
No apparent physical damage, and the oxide showing in the window isn't
funny-looking, but YMMV.
Avaliable for shipping, but I'm currently in need of a set of four 2MB SIMMs
(w/ IBM's SPD) to fit in a P70... hint hint... :)
Bob
evan <evan947(a)yahoo.com> wrote:
> Hi all... besides than the HP-95/100/200, what are
> other DOS clamshells of the era? I'm aware of the
> Atari Portfolio and the Poqet device, but there are
> several more, methinks...
Olivetti Quaderno? I haven't thought of those in years,
but my recollection is that it's a small XT clone with a
voice recorder feature.
More popular in Europe than in the US, too.
-Frank McConnell
Hi!
I just acquired an HP Integral on Ebay. Unfortunately there was no "Software
Engineering ROM" in this one so it is quite limited in terms of what one can
do with it. ( I guess it is quite limited anyway since is is almost 20 years
old )
Is there any one out there that has a "Software Engineering ROM" to sell?
Does any one have a binary image of the contents of the ROM chips? In that
case it wouldn't be to hard to do a simple board one self.
Other stuff for the HP Integral is intersting as well!
Thanks,
/Mattis
I have some HP 1000 E/F docs including some power supply docs and at one
point I did look at them to see if I could find information about that
battery resister. I never found it.
But someone else on the list told me that something like an 880ohm resister
across the left most and right most terminals of the middle row of the
battery connector input would trigger the power supply to power up all of
the way. That did the trick for the HP 1000 / 2117F that I have.
-Glen
>I've found the .pdf version of the HP 1000/M/E/F Engineering Docs, but
>every copy I've been able to access is missing section 9 (still can't keep
>track of the Roman Numerals they mark the sections with) which covers the
>power supply.
>
>There seems something a tad 'twinky' with mine, tho I seem to recall at
>one point someone had directed me to a jumper/resistor that needed to be
>installed at the 'Battery Input' connector on the rear to wake something
>up, but of course now that I'm working on it I can't find anything...
>
>Help???
>
>-jim
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I finally am almost within reach of getting my DEC 3000 300 working. A few
years ago I foolishly purchased it without memory, thinking it would be a
simple matter to inexpensively pick up some memory later. How wrong I was.
Now I have purchased a DEC 3000 300X with 160MB memory with the intention of
lending 32MB to the 300. Now I look at the back of the machine and my main
question is what cable do I need to hook up my VT220, or my VT420, or what
model monitor with keyboard and mouse is this thing supposed to work with?
In a typical DEC fashion, in the manual they do not mention model numbers of
monitor to go with it, but there are rough instructions that I may be able
to follow to get dumb terminal console working. I would ideally like to have
real monitor on 300X, VT420 on 300, leaving my VT220 free for my MicroVax
II.
Oh yeah, I have a TK50 in MicroVax II currently. I also have TK70 with
correct controller board that I would like to put in its place. Friend who I
acquired MicroVax II from claimed that I needed different cable to go from
TK70 controller card to TK70 drive than cable for TK50. It looks to me like
both cables have 26 pins in two rows of thirteen. I suppose one of the
cables might not be straight through but have a twist/transposition of pins.
Will my current cable work? Do I need a new one? Once I get it working,
anyone want the TK50 drive and controller card?
Bradley Slavik
