>
> If you want to make one, all it consists of are those 2-colour LEDs (red
> and green diode in antiparallel) with 2 wires in series with a 3k
> resistor (3k3 would also work) between the above mentioned signals and
> Signal Ground. But they're pretty cheap to buy ready-made.
>
> -tony
Radio shack has them for about $10. An invaluable tool!
Steve Robertson - <steverob(a)hotoffice.com>
-----Original Message-----
From: Dwight Elvey <elvey(a)hal.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Wednesday, June 02, 1999 4:24 PM
Subject: Re: More Bringing up a CPM
>ard(a)p850ug1.demon.co.uk (Tony Duell) wrote:
>--snip--
>> Then I got a small (small enough to sit on top of any part of a machine),
>> simple (but expensive!) logic analyzer.
>
> I still don't like LA's because they can often hide real
>signals. You see this nice squared wave that has been sampled
>by the LA's input. The real live circuit may see something
>else entirely.
The logic analyzer won't hide significant information about the logic and
timing. If you sample at twice the frequency of the fastest harmonic you
want to observe, you won't miss a thing. My ten-year-old TEK1240 only
samples at 100 MHz on 9 of its 72 inputs. The remainder can sample at
maximally 50 MHz. It is also capable of catching glitches. This is not
much by today's standards, but that sample rate will certainly answer
questions about the S-100 bus without fear of ambiguity.
>> What it hasn't told you is that one input does nothing,
>> and the gate is a simple inverter on the other input.
>> Yes, I've seen exactly that fault.
>
>This is why I use my oscilloscope instead of a logic probe.
>I can use more than one channel ( I don't consider single
>channel 'scope to be useful for much more than patterns
>in Sci-Fi movies ). Two channels is a minimum. While it
>is true that non-repetitive patterns are hard to deal with,
>in a computer I can often find a way to make the signal of
>interest repetitive. In the rare case that I can't ( only
>twice in 20 years of working with these things ), I rent
>a logic analyzer.
>IMHO
>Dwight
>
On Wednesday, June 02, 1999 4:05 PM, CLASSICCMP(a)trailing-edge.com
[SMTP:CLASSICCMP@trailing-edge.com] wrote:
> >> Athana is my preferred floppy media wholesaler. Go to
http://www.athana.com/.
>
> >But they stopped listing prices on their web page. Its rather annoying
> >to shop for floppy disks, when you have to call and ask for a quote
> >for each type you're interested in.
>
A few years ago, I threw out about 25K new 5-1/4 DSDD disks. I still have a
couple of cases left and they're up for grabs. There are 500 disks in a
case although, I usually yank out a couple of packets to make room for ther
sleeves.
I'll send them to anyone on the list for the cost of shipping * 1.2 (from
south Florida). I'd rather ship full cases but, will break them if no-one
wants that many. IIRC, a full case weighs about 15 or 16 pounds so take
that into consideration.
I also have a couple of cases of used ones that I'll let go for shipping *
1.
First come, first served.
Steve Robertson - <steverob(a)hotoffice.com>
>> Athana is my preferred floppy media wholesaler. Go to http://www.athana.com/.
>But they stopped listing prices on their web page. Its rather annoying
>to shop for floppy disks, when you have to call and ask for a quote
>for each type you're interested in.
Well, they *are* a manufacturer/wholesaler, and David's question did
say that he was interested in buying in bulk. I personally don't have
any problem with making a phone call to get a quote if I'm buying $1000
or $2000 worth of media.
On a side-note, Athana also has a very good selection of bulk
demagnetizers. See http://www.athana.com/ddequip/medequip.html
In particular, they've got a very nice table of media coercivities
and a "Degaussing FAQ" there.
--
Tim Shoppa Email: shoppa(a)trailing-edge.com
Trailing Edge Technology WWW: http://www.trailing-edge.com/
7328 Bradley Blvd Voice: 301-767-5917
Bethesda, MD, USA 20817 Fax: 301-767-5927
>Hey guys, we have a piece of equipment at work which requires
>DSDD 3.5" floppies. It won't work with the HD ones. And it's NEW
>equipment at that. Anyway, does anyone have a source for these
>where I could buy a large lot?
Athana is my preferred floppy media wholesaler. Go to http://www.athana.com/.
> I seem to recall a site on the net
>which sold them as well as 8" floppies but don't recall.
Athana also sells 8" floppies in bulk, as well as many 14" packs and
cartridges...
--
Tim Shoppa Email: shoppa(a)trailing-edge.com
Trailing Edge Technology WWW: http://www.trailing-edge.com/
7328 Bradley Blvd Voice: 301-767-5917
Bethesda, MD, USA 20817 Fax: 301-767-5927
This isn't quite classic--but almost.
I'm looking for a memory card for a Toshiba T3300SL laptop.
(A 386/25 circa 1992.)
Possible parts include Toshiba:
PC-PA2009U (16MB)
PC-PA2008U (6MB)
or Kingston:
KTT3300SL/16 (16MB)
KTT3300SL/8 (8MB)
KTT3300SL/6 (6MB)
with the larger sizes preferred, of course.
Other vendors may have compatible parts, too.
I have 2MB and 4MBcards that I'd be happy to trade/sell/giveaway
if I am able to find a larger card.
If you have one of these or know a good source, please let me know.
(I've searched for sites for the larger sizes on the Internet
to no avail.)
Thanks,
Dave
I'm also posting this response to classiccmp in case others are interested
in some of the details....
You wrote...
>Eek! COOL!! What media did you locate the software on? Is it running
>(or soon to be) on your 1000F's?
The media is still in transit, I haven't got it yet. He said it was on 7900A
disk cartridge, but he might also send it on 1/2 tape. It will start out
life running on two 2100A's. Then it will migrate to either my 2109B/2113B
or if that fails the 2117F's. Eventually it will also run on a Unix or
DOS/WIN PC via an emulator.
>Aargh! What is the capacity of a 7900A? Does the "Access" version
>require (shudder) a drum?
The 7900A is 5mb (2.5 fixed, 2.5 removable). The 7906 is 20mb (10 fixed, 10
removable). Only the very earliest versions of TSB used a Drum; since the
Access version is the last version of TSB ever made, it will run fine
without a drum (probably can't use a drum either). Even if I ever got a drum
unit, I think that would be beyond my capabilities to repair.
>So, for reference; what are the capacities (and form factors) of the
>listed drives? For that matter, what are the interface types? Are there
>third party equivs?
The 7900 uses a 12940 cartridge. This is a single platter, 24 hard sector
cartridge. It has a raised area on the top that opens to accept the heads
when inserted into the drive. From what I understand about RK05's, the disk
cartridge is mechanically/cosmetically similar. The 7906 uses a similar
cartridge (12989), but there is only one sector notch on the hub instead of
24. The 7920 (which I'm not really familiar with) I think used a 10 platter
top loading cartridge. PS - I might have 12940 and 12989 interchanged
above - poor memory :) Also, I don't recall the mils measurements, but the
internal media platter is a different thickness between the 12940 and 12989.
The 7900 drive hooked up to a 13210 controller in the cpu backplane. You
could daisychain 3 more drives off the main 13210 controller.
The 7906 used a different arrangement. In the cpu backplane was a 13037
card, which went to a rackmount box called a 13037 disc control unit (about
5 inches tall). Cables from the 13037 went to each 7905/7906/7920 drive.
ISTR that the 13037 disc control unit (rev C at least) could support up to
eight drives, and could support two separate computers. It also supposedly
supported HP-IB drives too (but I don't think TSB would use the HP-IB
drives, even through the 13037).
>No, can't have that! Redundancy and all!! 'Off-site archive?' B^}
I haven't settled on which systems I'll run it on yet (2100, 21MXE or
21MXF), Because I haven't, I will likely have some equipment left over from
my scavenging. If so, it will be offered on classiccmp.
>Aargh II! I'll try shaking some bushes around here and see if anything
>falls out.
Mucho Appreciation!
Jay West
You wrote...
>I thought the A series followed, ending in the A990 ... which is called
>a "1000" in HP's docs. (The A series are single board computers,
>with the A990 listed as "3 MIPS")
Thanks for the tip Stan! I know absolutely nothing about the A series. I
didn't know if they were also part of the 1000 line. I appreciate your
correction. One remarkable characteristic about the 2100/21MX line is that
each sucessive machine released supported full backwards instruction set
compatibility. For instance, the 21MX M, E, and F series all are fully
backwards compatible with the 2100 instruction set (except for timing
dependent loops). Do you know if the A series also supports the 2100
instruction set?
>I'm still in the process of sorting through dozens of boxes of HP manuals,
>but I've noticed at least two boxes of HP 1000 manuals of various kinds
>(including some maint/diag manuals). I'll post more later, when I've
>figured out more.
Of course, I'd love to hear what 1000 manuals you might have!
Jay West
Sorry for the global message, but how can I get digest mode emails from this
group? Thanks.
--------------------------------------------------------
Todd Osborne
Senior Software Engineer
FMStrategies, Inc.
http://www.fmstrategies.com/
--------------------------------------------------------
FMStrategies, Inc: tosborne(a)fmstrategies.com
Internet E-Mail: todd.osborne(a)barnstormer-software.com
--------------------------------------------------------
Founder of the Virtual Windows Class Library (C++)
http://www.vwcl.org/
--------------------------------------------------------
Anagrams? (http://www.wordsmith.org/anagram/)
Can you figure out this one? Want the answer? E-Mail me.
COCO VERDI MOM (Hint: Think Late 1970's Computer)
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