test-drb March 2011

test-drb@ccmp.vtda.org

146 participants
225 discussions

by tshoppa＠wmata.com

> Speaking of DVD and archives too large to fit on one media, does anyone > have a good solution for pointing at a large file system (such as > bitsavers top level directory) and specifying a size of the target media > and let it sort out the archiving problem? I would like not to use an > archiver, but rather have the individual files copied to the target such > that they are available individually as files, as well as an index > somewhere specifying which item of the backup the file landed on. For the past decade my solution has to been write a perl script :-). Previous splits to CD often worked hard on filling every nook and cranny of every CD but I don't try so hard anymore. (This was the original use of the "foundbymb" sort you see remnants of below.) To be super duper efficient required knowing things like rockridge/joliet extension names and the extra space they took up etc. This one splits up bitsavers into slightly-smaller-than-DVD-sized chunks (using soft links), and makes (to standard output) a index that can be copied to each DVD: #!/usr/bin/perl use strict; use File::Path qw(make_path); use File::Find; my $total; my $prefix = '/home/shoppa/www.bitsavers.org'; find(\&wanted, $prefix); my @foundbymb; my @foundbyalpha; my %files; sub wanted { my $name = $File::Find::name; my $size = -s $name; next if -d $name; $files{$name} = { "name" => $name, "size" => $size, "dir"=> $File::Find::dir } ; $total += $size; } my $cdn =1; my $maxbytes = 4400000000; my $thisbytes = 0; my %madedir; for (sort keys %files) { my $size = $files{$_}{"size"}; if ($thisbytes + $size > $maxbytes) { print "DVD $cdn finished with $thisbytes bytes\n"; $thisbytes = 0; $cdn++; } my $cdm = sprintf("%02d",$cdn); $thisbytes += $size; my $indir = $files{$_}{"dir"}; my $outdir = $indir; $outdir =~ s/$prefix/$cdm/; if (!exists $madedir{$outdir}) { make_path($outdir); # or die "didn't make $outdir\n"; $madedir{$outdir}++; } my $inf = $_; my $outf = $inf; $outf =~ s/$prefix/$cdm/; link($inf,$outf) or die "didn't ln $inf $outf"; print "$outf\n"; } print "DVD $cdn finished with $thisbytes bytes\n"; print "Total size is $total\n";

13 years, 9 months

Help to format diskettes for At&t 3b1 or Altos systems in a PC

by spedraja＠gmail.com

I need and be happy to receive some help to format diskettes for At&t 3b1 or Altos ACS/586/686 systems in a PC. I tried to do it in one 286 PC with one TEAC HD unit with bad results. I've encountered some documents in the Net about the matter but nothing definitive. -- Saludos - Greetings - Freundliche Gr??e - Salutations Sergio ----- "No creas todo lo que ves, ni creas que estas viendolo todo"

13 years, 9 months

Who will be the last HD maker down the road?

by vintagecoder＠aol.com

On Tue, 08 Mar 2011 18:14:38 -0600 cctalk-request at classiccmp.org wrote: > From: Richard <legalize at xmission.com> > Subject: Re: Who will be the last HD maker down the road? > To: cctalk <cctalk at classiccmp.org> > Message-ID: <E1Px1RU-000789-Ic at shell.xmission.com> > > > In article <4D75366B.21696.2604652 at cclist.sydex.com>, > "Chuck Guzis" <cclist at sydex.com> writes: > > > We may be using flash both for external storage and internal storage. > > Flash memory is problematic for secure data. Basically, its nearly > impossible to securely erase a file from flash based disks. I don't know how that can be true. I can understand deleting doesn't work but is it true a simple dd if=/dev/zero of=/dev/sdx onto the flash card doesn't fill it with zeros? And even if it doesn't, how hard is a flash card to destroy? Hard disks are tough as nails but flash memory can be snapped in two with your hands or a pair of pliers and burned...

13 years, 9 months

hardware multiply/divide functionality in CPUs (6809)

by julianskidmore＠yahoo.com

Hi folks, > > At 23:56 -0600 3/7/11, Jules wrote: > >Yes, that seems to be the 'famous' one that gets mentioned everywhere. > > It > >seems it was of the shift-add variety. Anyone recall if it would work > > with > >signed integers? (I'm just trying to work out how the math works for > > signed multiplies at the moment) Mark Tapley wrote: > MUL is unsigned arithmetic only. Actually this isn't *quite* true. An n x n bit unsigned multiplier producing a 2n bit result also produces the correct signed results for the bottom n bits. Thus the 6809's MUL instruction produces the correct answer to A = -20 * B = -3 as it will store -60 in the B register. The reason is because with the n x n bit multiplier multiplying a * b, where b is -ve => a* ((2^n) - (-b) ) = a*(2^n) + a*b = a*b since a*(2^n) doesn't contribute to to the lower n bits. Consider a 2-bit multiplier dealing with the -ve * -ve and -ve * +ve cases: 01 * 10 = 0010, = -2 correct. 01 * 11 = 0011, = -1 correct. 10 * 10 = 0100, = 0 correct. 10 * 11 = 0110, = 2 (or -2) correct. 11 * 11 = 1001, = 1 correct. -cheers from julz

13 years, 9 months

A first for the VCF ..... epic technical poetry!

by evan＠snarc.net

On the Day #2 of the VCF East 7.0 (Sunday, May 15), there will be something new and different -- folk singer Mike Agranoff will perform his 1987 epic poem "The Ballad of Captain Crunch" and other technical-themed works. Really! VCF East site: http://www.vintage.org/2011/east VCF on Facebook: http://www.facebook.com/vcfeast7 (please 'like' us there)

13 years, 9 months

40 pin DIP chip tubes?

by legalize＠xmission.com

Any idea where I can get some cheap? I'd like to store these 6805 chip pulls in something better than a plastic bag. -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://legalizeadulthood.wordpress.com/the-direct3d-graphics-pipeline/> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>

13 years, 9 months

Heath H-1 analog computer

by mcguire＠neurotica.com

Hey folks! I'm giggling like a little girl here, so I just wanted to share. :) Recently I was lucky enough to acquire a Heath H-1 analog computer from a very cool guy named Norman in Maine. My lady and I drove up there to pick it up. It's...just plain awesome. I've just finished putting together a page about it here, with pictures: http://www.neurotica.com/wiki/Heath_H-1_Analog_Computer -Dave -- Dave McGuire Port Charlotte, FL

13 years, 9 months

New year finds

by spedraja＠ono.com

Having in mind the recent mention in this list of one rare TRS-80 in eBay... I'm searching for ONE or a COUPLE of these items in this new year. * One Tandy 16 with Xenix * One unibus PDP-11 (35, 40, 45, 70...) to run early Unix family versions * One HP1000, 2000 or 3000 * One AT&T 3B2. I got one 3b1 and one 3b2/400, but this last in near to go down and need a replacement. * Xenix for the Altos 586, better in floppy format. I got one system but ist Xenix kernel is damaged. The rest is operative. * MP/M in 8" floppied for one Altos... 5-15 or 8000 ? I'm not sure about the model nor the terminal that it needs (VT-220 would be fine?) * One BA80 monitor for one compact (and funny) Nixdorf 8870. I got too one PDP-8/E needed of some boards to be operative, but it can wait by now. All in the most compact but operative versions available (not the monitor, of course). I have space available for them, but not in excess. All of them in the EU (European Union) area. Sergio

13 years, 9 months

TRS-80 hiding?

by mcguire＠neurotica.com

Hey folks. Check out eBay #310298743467. Is that a TRS-80 Model I hiding inside the bottom front of that scan controller? It sure looks like one to me. -Dave -- Dave McGuire Port Charlotte, FL

13 years, 9 months

Heath H-1 analog computer

by dougcoward＠hotmail.com

Congratulations Dave. I have only seen one up close - one time. About 15 years ago I did get ahold of most ot the manuals from the heathkit manual replacement service, all except the es-600 function generator manual. I still have not found a reason it is called the HC-1. I just call it the Heath Electronic Analog Computer Model ES-400, because es-400 is the model for the cabinet kit. I have a magazine cover about the Heath Analog Computer at http://www.cowardstereoview.com/analog/readlist.htm I've envious, Good Luck with it. --Doug Coward Poulsbo, WA The new home of the Analog Museum and History Center is http://www.cowardstereoview.com/analog

13 years, 9 months

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test-drb March 2011