I recently got a book titled High-Speed Computing Devices 1st ED. 1950. This
is a design survey of how to build an electronic digital computer and has
schematics of gates, adders and accumulators done in vacuum tubes. At the
time there were around 10 working computer in the U.S.
I have been adding to my magazine scans. I found a decade counter circuit
implemented with four 12AU7 tubes (dual triodes) in the October 1955 Radio &
Television News. (50 year rule.)
http://www.swtpc.com/mholley/ElectronicsWorld/Oct1955/RTVN_Oct1955.htm
It is almost the same circuit Don Lancaster implemented with RTL ICs in the
February 1968 issue of Popular Electronics.
http://www.swtpc.com/mholley/PopularElectronics/Feb1968/PE_Feb1968.htm
Michael Holley
www.swtpc.com/mholley
Hi,
I want to move my scanners over to one of these Macs
(probably the 840AV since I can also exploit the video
capabilities thereof).
But, it's got those wacky DB25 SCSI connectors. :-/
I have DB25-Centronics cables. And, DB25-HD50 adapters.
The scanners have a hodge-podge of *different* connectors
(sheesh! talk about "standards"... :< ).
I assume a good goal is to minimize *connections* wherever
possible. So, instead of DB25-HD50 adapter to HD50 cable,
use DB25-HD50 cable, if possible.
But, I'm nervous about the DB25's and their roles in all this.
Is this just a regular SCSI (narrow, SE) bus with a few less
returns? Or, are there other consequences of this connector
choice?
E.g., how much grief can I expect going *through* the slide
scanner with DB25 coming in and Centronics going out? Is
this just effectively a "DB25-Centronics" adapter with a
device tap in the middle?
Thanks!
--don
Since TI 340 stuff was was people were most interested in there are
also some TI 32010/20/C30 manuals in the pile. Those are the earlier DSP
chips. Let me know if I should grab them. Same you pay shipping from 20817
--- Tony Duell <ard at p850ug1.demon.co.uk> wrote:
> > My father built himself a board which was simila
r
> but more elaborate:
> > he could select among (1) a small (7.5W?) light
> bulb, (2) a large
> > (100W?) light bulb, (3) a high-wattage heating
> element that was still
> > under the breaker trip current for that mains
> circuit (an iron, I
> > think), or (4) no limiter at all.
>
> Another useful limiter (to repleace (3) in your
> setup is a 1000W tungsten
> halogen bulb (e.g. one of those 'security lamps'.
> They're pretty cheap
> now).
>
>> snip <<
>
> -tony
>
Tungsten bulbs cheap??!!!!
The ones we have to buy for equipment at
our lab cost like ?500 (GBP).
Regards,
Andrew B
aliensrcooluk at yahoo.co.uk
If the disk will spin up, and it has a unibus interface, like
a UDA-50, then i would move it to a working 11/44, boot up
unix and make an image copy of the disk and then copy it
over the network to a linux computer.
no doubt a skilled vms person could do the same with vms.
(because, well, how big could the disk image be? :-)
Or you could jam a unibus scsi card in and copy an image of the disk to
a JAZZ drive.
Once the image is on a linux machine you have (as we all know) a large
number of forensic tools... Not the least of which is simh, which you
could possible use to boot the original os. Worst case you should be
able to extract files from the file system with putr or other tools.
heh. send me the disk and I'll take a crack at it.
I think we need a picture of the disk drive to identify what it is.
(and here's to hoping it's not an RP or RM drive :-)
-brad
On Sep 1, 2006, at 11:23 PM, cctalk-request at classiccmp.org wrote:
> Date: Fri, 1 Sep 2006 18:21:11 -0700 (PDT)
> From: "Zane H. Healy" <healyzh at aracnet.com>
>
> My personal advice, get a C64, or maybe a C64c, skip the C128. I'm
> saying
> this not because I have anything against the C128, but because it
> will be
> different from what you remember. Plus as has been pointed out, it
> does
> take up more desktop space.
>
> My "fondness" for the VIC-20 has been replaced with a "fondness"
> for the C64
> (a machine I hated when I was using the VIC-20, which was through
> mid-1986).
> I really want to setup my one nice C64 system, I mean I *REALLY*
> want to set
> it up. Unfortunatly I don't have the space, and truth be told, the
> time. I
> also really want to setup an Apple // of some sort, most likely a //
> gs, but
> there is the same problem.
>
> I need to find a really good excuse to set up one or the other, and
> so far I
> haven't found one.
>
> Zane
I agree with this, the C64 or a 64C (I had both) represent the height
of Commodore 8-bit, though I have always wanted a 128D. There are
supposedly "mint" in box examples of these on eBay right now. VIC-20
too. The 128 does have the Z-80 for CP/M though, if that interests you.
David
DavidGreelish
classiccomputing.com
The Home of Classic Computing Podcast
and Computer History Nostalgia
Folks, I asked similar questions directly and got the following answers.
So, don't know if it is RT, RSX, or RSTS, or even a flavor of Unix.
Joe Heck
-------- Original Message --------
Subject: Re: 11/64 conversion
Date: Mon, 04 Sep 2006 12:57:43 -0400
From: Shreekrishna <skrishna at ncsu.edu>
To: joe heck <trash3 at splab.cas.neu.edu>
References: <44FC51AB.1020600 at splab.cas.neu.edu>
Hello,
I have only small information. My advisor was using the computer long
back. Now the computer is in University of Texas austin. He said that
the data is in PDP computer and our research group need the data . SO we
need to convert the data. It is in some ASCII format though I dont know
the type. So i need to ask .can the data be converted to recent file
formats.
File type is some ascii format. It was read from a machine. so they are
basically read from the machines.
compueter boot and we have the hard disc and floopy in which the data is
stored.
So tell me...how shall i go about...do reply
thanks
shree.
joe heck wrote:
> What is the operating system?
> What are the file types or extensions?
> What program created them?
> What peripherals are on the PDP computer?
> Does the computer boot?
> How much data are you talking about?
>
> You need to post the answers as best as you can to these questions
> before most people will even try to help.
>
> Joe
During an inexplicable urge to do some cleaning up, I found a powersupply
for which I have no need.
I believe it comes from an Apple (GS II?), and is identified as ASTEC, model
AA13591
Input : 230V at 63W, 50/60 Hz.
Output : V1 : +5VDC at 4.0Amp; V2 : +12VDC at 2.5Amp; V3 : -5VDC at 0.25Amp;
V4 : -12VDC at 0.25Amp.
It worked when I dismembered the system it came from.
You can have it for P&P ; net weight 1250g
Nico
