I have a VAX730 with both TU58 drives destroyed (capstan melted, need
I also have a bunch of cassettes, but unfortunately all seem to have
problems with the bend and/or bad spots on the tape.
Possibly I would try to replace the broken bands (if I find a source)
and/or replace the magnetic tape when damaged (I was thinking to try
with audio cassette tape, don' t know if metal oxide high density tape
could be good for it).
Anybody has some information about the coercivity of original DEC TU58 tape?
One problem indeed is the need of reformatting the tape, but: if I can
emulate the TU58 drive using a serial, would it be possible to send
raw commands to the drive using the serial and a PC?
PS-If possible, some good-condition cassette would be very useful to
me too. I'm located in Italy.
A friend of mine just returned a modem he got from me decades ago, a
Ventel MD212-plus. It's an early-1980s non-AT-command-set
autodialling modem. The settings are adjusted via a pair of 10-pin
DIP switches accessible from the back. I've checked the web and
bitsavers. So far, all I've found is some old Usenet articles and a
couple of pictures, but no manual or jumper guide.
One "feature" is that it lacks a modular jack to plug into the phone
system. Fortunately, my friend kept the proprietary DA15 cable. I've
never seen that choice of connectors on any other modem.
Does anyone have any Ventel docs?
Many of us maintain large collections of bits that we'd like to preserve over a long time, and distribute, replicate, and migrate via unreliable storage media and networks. As disk sizes (and archive sizes) have increased, the probability of corruption undetected or uncorrected by the mechanisms normally built into disk drives, network protocols, and filesystems has increased to a level that warrants great concern.
I would be interested to know if there exists an archive format that has the following desirable properties:
1) It is well-documented, and relatively simple, to facilitate its implementation on many platforms present and future.
2) It supports some degree of incremental updating, but need not be particularly efficient about it. An explicit compaction operation is preferable to an overly complex format. It is adequate to use append-only strategies appropriate for write-once media.
3) Insertion and extraction of files, copying of the archives, and other archive-manipulation utilities support end-to-end verification that identical bits have been stably recorded to the media, bypassing or defeating platform-level or hardware-level caching mechanisms. Where this is not possible, the limits must be carefully delineated, with some basis for determining the properties of the platform and certifying reliability
properties where possible.
4) The format should provide for superior error detection capability, designed to avoid common failure modes with mechanisms typically used in hardware. For example, use a document-level cryptographic checksum rather than a block-level CRC.
5) The format should include a high degree of internal redundancy and recoverability, say, along the lines of a virtual RAID-array.
Just as biological organisms constantly correct DNA transcription errors,
the idea is to have a format that is robust across long-term exposure to
imperfect copying and transmission channels.
Does anything like this exist?
----- Original Message -----
> Date: Sun, 22 May 2011 22:56:32 -0500
> From: Daniel Seagraves <dseagrav at lunar-tokyo.net>
> Subject: Re: Scraping DEC Equipment
> To: "General Discussion: On-Topic and Off-Topic Posts"
> <cctalk at classiccmp.org>
> Message-ID: <C7A98127-DFF4-41B1-A6AF-5DFCA234D286 at lunar-tokyo.net>
> Content-Type: text/plain; charset=us-ascii
> I need a tractor feed assembly for a LA100, are the ones on the 120
Apparently not, but I might have one for an LA100.
I would like to get a Tek 4404 computer going but lack any service
manuals. The system turns on but has no curser on the screen. Has
good power from the Power supply and heater is on in the CRT.
Has a row of LEDs on the mother board. Does anyone know how
to read these.
- Thanks, Jerry
On 7 May 2010, at 08:25, cctalk-request at classiccmp.org wrote:
> Message: 2
> Date: Thu, 06 May 2010 16:06:37 -0700
> From: Al Kossow <aek at bitsavers.org>
> Subject: Re: Servant .953
> To: cctalk at classiccmp.org
> Message-ID: <4BE34B7D.6060902 at bitsavers.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> On 5/6/10 2:23 PM, Fred Cisin wrote:
>>> Al Kossow wrote:
>>>> I am interviewing Andy Hertzfeld tomorrow, and had hoped to talk about
>>>> Servant, but I can't find a copy of it around anywhere tonight.
> A huge thank you to Nigel Williams who forwarded a working copy of .951 five
> minutes before Bill and Andy arrived. We spent an hour talking about MacPaint
> and Quickdraw (Apple has finally given CHM approval to make the sources available)
> then another hour on Alice, Dali Clock, Servant, Hypercard, and Magic Cap.
Could you please clarify, the QuickDraw source is available for what purpose? Could developers modify it any include it in heir commercial 64 bit Intel applications for instance?
Is the source Pascal, Assembler, C or something else?
Director of Microspot who has a Carbon application which compiles with over 10,000 warnings about deprecated QuickDraw calls.
When Multics was officially released as free software a couple of
years ago, there was a flurry of activity aimed at getting some sort
of emulator up and running to run it. Did anything ever come of that
or did folks just lose interest (or find out that the needed
GE/Honeywell hardware was too poorly-documented to write an emulator
They seem to have broken it sufficiently now that nothing is returned after the end of October.
Is there anyone indexing Usenet that has a clue? It seems like all that is left is for-pay
services for searching alt.binaries.
I have a monitor for a Stardent workstation. It's a re-badge Sony, model
Free for pickup, or 1.2 * cost of shipping to recoup time and trouble if
you want it shipped.
Please respond soon if you are interested as it will be going off for
scrap in a week if there are no takers.
Sellam Ismail Vintage Computer Festival
International Man of Intrigue and Danger http://www.vintage.org
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