The quintessentail 'arty' machine I still say is the Coleco ADAM! Not
so much for its external appearance but my its internal structure was
worth crowing about. And it was a bargain in 1984's 8-bit computer
crash. Oh. So sad!
And 'artsy-fartsy'. Haven't seen that term since I came across a
hang-out/bar/folk-arts place in Tokyo in 1997.
I've been trying to find (on the net) information regarding the signal
timing for the 3.5inch floppy diskette drive.
I want to play around with one and connect it to one of my home-brewed
systems (6502 or 8085), but I need to know the timing of the signals, plus
what the different logic levels means on some signals, etc. I can get plenty
of information regarding the 34-pin connector and signal names, but nothing
on timing and logic levels.
I'd be most happy if someone could illuminate me to where I could get this
> is there currently or will there ever be a good long time
> permanent solution for good promising backups?
you have to assume that you will migrate digital files to media
capable of being read reliably until the next generation of mass
storage arrives. all of the other protections (redundancy, error
correction, etc.) need to be in place as well to protect against
migration of data that has already been corrupted.
the good news is that transfer rates and bit density increase with
time, so old data is easier to migrate
the bad news is the amount of data to migrate is increasing exponentially
Had a mail from someone wanting to know how much her 'Woz' GS is worth and
does anyone want it? It apparently 'has everything' so I've asked her to
define what that means, as 'everything' for the GS is quite a pile :)
$50 - $150?
Binary Dinosaurs creator/curator
Www.binarydinosaurs.co.uk - the UK's biggest private home computer
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Date: Mon, 26 Feb 2007 07:55:52 +0900
From: Tim Sneddon <tesneddon at bigpond.com>
Subject: Selling my VAX, Alpha, PDP-11 and other spares (was Re: Selling
PDP-11/83 and various spares...)
Re: <45d4fdf3$0$16270$88260bb3 at free.teranews.com>
Id: <45e20788$0$16343$88260bb3 at free.teranews.com>
Most of my PDP-11 stuff has been sold. However, I do have a collection
of Q-BUS VAX spares, some Alpha bits, SCSI stuff. some more PDP-11
stuff I didn't even no I had, a few manuals and some other bits and
I won't be listing any of this stuff past this coming weekend as I
will no longer have any storage and all this stuff will be going in
I will be listing quite a lot of the items mentioned above over the
next two days.
PS. Once again, apologies for cross posting.
Posted via a free Usenet account from http://www.teranews.com
Date: Sun, 25 Feb 2007 17:02:01 -0800
From: "Chuck Guzis" <cclist at sydex.com>
Subject: Re: New "D" drive -- WD Caviar
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Message-ID: <45E1C109.17821.6AF8FBA at cclist.sydex.com>
Content-Type: text/plain; charset=US-ASCII
On 25 Feb 2007 at 16:05, Hollandia at ccountry.net wrote:
> The new drive has jumper settings for SLAVE, NASTER and SINGLE, but so far
> as I can tell, none for "cable select."
The drive is a 6-pin jumper block drive. For CS, jumper pins 1&2 of
J8; leave other jumpers off.
> 1) How do I set this new drive for "cable select"?
> 2) Will wrong BIOS settings caues the drive's existence to not be recognized?
Not usually--the drive should at least be able to identify itself to
1) Actually, according to WD it's a 10-pin drive, but CS is still pins 1&2.
However, I doubt that an old 486 would recognize CS, even with an
80-conductor cable; the existing one probably works because it's treated
as a master with a 40-conductor cable.
If there is a second (unused) IDE port, set the second drive as single master
(no jumpers or 4&6) and plug it into the second port.
If not, change the existing drive to dual master (pins 5&6) and set the second
drive to dual slave (3&4).
2) Unlikely, but possibly, especially since AFAIK that BIOS does not have an
auto-detect option; in any case, if the BIOS is set incorrectly you will almost
certainly have trouble when you start using that drive.
I've brought this up on the list a couple times, and the concensus among
fellow HP'ers was always "these connectors aren't around anymore". Some are
happy to just push a resistor into the 21MX battery connector, but I have
one of the HP connectors built specifically as a battery eliminator plug and
I wanted more. The resistors can fall out if just pushed in or not make good
contact. After working with someone at AMP (Tyco), the following information
These are the old AMP "MR" (miniature rectangle) connectors.
Here's the parts for a HP 21MX battery eliminator plug, with AMP part
numbers & mouser prices:
Pin housing (cap) 1-640511-0 $0.82
Strain relief (shell) 350522-1 $1.24
Live split pin contact (tin, 26-18 awg) 640545-1 $0.17 (need 2)
Live split pin contact (tin, 26-24 awg) 640579-1 (need 2)
Live split pin contact (gold, 26-18 awg) 640545-2 $0.40 (need 2)
Live split pin contact (gold, 26-24 awg) 640579-2 (need 2)
These are all current production parts and still available new. The only
mismatch - the HP plugs were black and these are red :)
If I build up a bunch of battery eliminator plugs, I wonder if I can get $20
each on ebay ;)
Hope this helps folks!