Any interest perhaps here in a bunch of DECServer 200 Rackmounts Bracket ?
Part number is 74-33241-01
I have about 16 of them.
Also have put some more DEC bits and bobs up on my Old Computer Market.
Cheers,
Stefan.
>From: "Vintage Computer Festival" <vcf at siconic.com>
>
>On Tue, 17 May 2005, chris wrote:
>
>> >1. Microcomputer
>> >
>> >A "microcomputer" is defined as a computer having no more than two
>> >microprocessors used for general purpose processing within the computer.
>> >For the purposes of this class, a "microprocessor" is defined as a central
>> >processing unit comprised of not more than 4 individual LSI intgerated
>> >circuit on a single board, with the entire ALU being contained within a
>> >single integrated circuit.
>>
>> Will this definition change when Apple starts selling 4 processor G5
>> towers? Or will those (and 4 processor Pentium workstations), not apply
>> because they are far too new?
>
>Will they still be intended for use by one person? I don't know why we
>didn't think of it before, but instead of "Microcomputer" it should
>perhaps be "Personal Computer".
>
Hi
When I was at Intel we worked on MDS800's and Series II's.
These were definitely not personal computers yet they were
clearly micro computers.
I think like classifying planets and asteroids. There just isn't
a clean line separating the two. Most uP machines of today
far exceed the capabilities of most mini's of the 70's.
Having multiple processors doesn't pan out.
Dwight
>From: aek at bitsavers.org
>
>
>> A scrap of paper upon which is written:
>
>REALLY REALLY REALLY REALLY bad idea.
Hi
I agree. I've had to recoder code from paper once.
I'm sure it was all clear years ago when printed but
I had to spend several hours under magnification
to figure out some of it. Luckily, it was 6502
machine code. Picking the right thing was relatively
easy. If it had been some type of random data, it
would have been more random whan I got done with it
than was intended.
>
>The paper WILL be lost.
>
>While I don't agree with the complexity Sellam has come up with
>whatever you do needs to have that level of metadata in the file
>itself.
>
>The specific nasty example of this are the hundreds of Whirlwind
>paper tapes the Computer Museum has. They are indexed with a part
>number. They don't appear to have the index for these numbers.
>
You may have hit one of the biggest nails smack on the head
on this one. I believe that for archiving that indexing
is a much more difficult problem than how to store the data.
Dwight
>From: "Randy McLaughlin" <cctalk at randy482.com>
---snip---
>
>
>As for corrupted media bit dumps (including formatting bits not normally
>saved in data dumps) can be a godsend, it may be possible to reconstruct
>corrupted data streams by bit shifting.
Hi
I've done this for cassette tape recordings. It was
Manchester encoded so I also had to invert bits as well.
Dwight
> A scrap of paper upon which is written:
REALLY REALLY REALLY REALLY bad idea.
The paper WILL be lost.
While I don't agree with the complexity Sellam has come up with
whatever you do needs to have that level of metadata in the file
itself.
The specific nasty example of this are the hundreds of Whirlwind
paper tapes the Computer Museum has. They are indexed with a part
number. They don't appear to have the index for these numbers.
>
>Subject: Wanted: Rubber drive wheel for HP 9144 tape drive
> From: Bill Richman <bill at timeguy.com>
> Date: Tue, 17 May 2005 09:08:21 -0500
> To: cctalk at classiccmp.org
>
>I'm trying to help a friend locate a replacement tape drive wheel for an HP 9144 tape drive. He says that there's a hard roller inside the tape cartridge, and there's a softer (rubber?) roller in the drive that pushes against it, pulling the tape along. Apparently the softer rollers tend to turn to "goo" after many years. He's been working to recover some archived files from the beginnings of the company he works for, mostly for historical interest, and his last tape drive recently succumbed to the "goo" problem. Anyone have any replacement rollers that would be in any better shape, or any suggestions for alternatives? Thanks!
>
Line Breaks!
I just scrape off the goo and use some suitably sized tygon (Vinyl)
tubing to make a replacement roller.
Allison
Also, many tapes (depending on make and age) can
actually be so brittle that during the read the material seperates from
the transport, not a pretty sight.
--
What appears to happen is the adhesion to the previous layer of tape is
greater than to the original, and it strips the oxide and binder to clear
mylar (not a pretty sight or sound).
I have become VERY cautious when working with old floppies and tapes and
assume that I will only get one pass at recovering the data. For discs,
you want to keep the heads moving. I've crashed a LOT of disc packs by
staying on a single track too long.
So, what is the latest version of Teledisk that one can find? And what
version is preferred?
I have found versions 2.11, 2.12, 2.15, and 2.16. None of them seemed
reliable though .. some disks worked, some didn't. Like Jim, I
standardized on the Central Point Option Board. (Wish I had spares
though .. they are pricey as of late.)
For non-protected diskettes I use ditu, Linux dd, or any other sector
copier that creates a raw diskette dump. For copy protected diskettes I
use the Option Board, and Teledisk if I have the patience. All of my
cataloged diskettes have the labels scanned too.
Mike
>
>Subject: Re: Tandy T100 info
> From: John Hogerhuis <jhoger at gmail.com>
> Date: Mon, 16 May 2005 17:58:44 -0700
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>On 5/16/05, Allison <ajp166 at bellatlantic.net> wrote:
>> I'll have to look more at all this. However, step one is to
>> get the M100 I have up to 32k ram. Then I'll look at how secondary
>> rom socket space is used. I'd like a configuration that also has
>> ram at 0000h and maybe a OS in it. I've considered getting
>
>That has been done... I believe what you do is put a RAM in the Option
>ROM socket and bring out the necessary signals (/WE I think). Also the
>NEC 8201A and NEC 8300 are able to switch to all RAM mode with a short
>program.
I'd be surprized if it weren't already done. Way too easy. The switch
for M100 is also trivial piece of code. The real trick is to keep
the rom socket available. So the magic is to make the all ram option
a third one and software selectable.
>There was at some point in time a device called a PIC Disk that
>allowed you to run CP/M on the Model 100. It connected to the bus
>expansion port underneath the M100.
Tandy also had one that added a vidio and disk to the M100 that
used the bus connector. I have part of the manual for it.
Allison
>From: "Barry Watzman" <Watzman at neo.rr.com>
>
>Re: "But gathering together a large number of rare, desirable items
>(however subjective) into one place without a will or letter of
>intent is not "archiving". In fact it's the opposite -- items were
>taken out of circulation probably permanently."
>
>A point here that might be worth making to Don's widow is that since the
>materials in question are software archives, they can both be made available
>to the world while she still retains the physical items and library herself.
>It's not like collecting motorcycles. These items can be duplicated without
>any destruction of the originals.
Hi
I don't believe this is her issue. I suspect it is a combination
of grief, anger and ignorance. I think the main thing to do is
to let her know that she shouldn't just dump the stuff. Beyond
that, I'd guess just back off and leave her alone.
Dwight
