test-drb October 2006

test-drb@ccmp.vtda.org

217 participants
352 discussions

by adamg＠pobox.com

Seth J. Morabito wrote: > Does anyone have any guidelines about making archival images of > CD-ROM media? For years, I've been using dd on Solaris or Linux > to dump the raw bytes of CD-ROMs, and cdrecord if I want to make > a copy from the raw image, but I don't know if this is considered > "good enough" to preserve all the associated filesystem and partition > structures of the disc. It has been for me, so far, but I'd like to > hear other opinions on the matter. How do you archive CD-ROM images? As long as there's only one track on the CD, dd on Linux will grab everything. On Solaris you might have to be careful to pick the right device node so you grab the whole thing. On MacOS X you definitely have to pick the right device node -- the one time I tried it, I picked wrong and only got one partition. Multi-partition discs usually have just one track containing all partitions. If you want to be sure you can "cdrecord -toc", if there's just one data track, you're good. Some discs actually do have more than one track. The SunCD demo disc is an example. It has a data track (probably with multiple partitions, I don't remember) and a few audio tracks. Some combination of dd (or readcd -- see below) and cdparanoia should be able to copy discs like this. I usually use dd, or even cat, on the first try reading a disc, just out of laziness. But there's a program 'readcd' (part of the cdrtools suite, IIRC) which is a little more sophisticated. In particular, if a disc has a marginal sector or two, dd will give up, but readcd will retry until it gets a good read. Another note, if you are reading CD-Rs which were written in TAO mode, you will get some empty sectors appended to the end, then an I/O error as your drive tries to read past the leadout. But you're not actually losing any data. -- Adam

17 years, 9 months

(no subject)

by drb＠msu.edu

Anyone have a rev. E or later ROM for an Emulex QD21? Thanks, De

17 years, 9 months

EBCDIC

by ygehrich＠yahoo.com

At 08:22 PM 10/26/2006 Ethan Dicks wrote: >I used to use EBCDIC on a regular basis when I made HASP/3780/SNA >gear... now, I think I can only remember 'space' and the numbers.* Yes but do you remember good old BCD

17 years, 9 months

looking for the HP Vectra ('286) and Televideo Telecat

by chrism3667＠yahoo.com

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17 years, 9 months

looking for the NCR PC4, PC6, PC8

by chrism3667＠yahoo.com

please inform. Thanks. I do have 2 PC4's in *very* questionable condition if anyone is interested (for shipping). I'm primarily looking for the color version of the 4. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

17 years, 9 months

TRS-80 Model 16

by kelly＠catcorner.org

> Sent: Thursday, October 26, 2006 5:41 PM > To: General Discussion: On-Topic and Off-Topic Posts > Subject: TRS-80 Model 16 > > > I've got a TRS-80 Model 16 that I'm going to put on ePay, but I'd > like to clean some of the grunge out of the half-height Tandon 8" > diskette drives. > > In a nutshell, can someone tell me the easy way to remove these > drives from the case? > Model 16 or 16B? The procedure is different. If it is a 16b: Remove slot access cover in back. Turn the computer over (feet up) Remove the 10 or so screws from around the case Turn back over, being carefull to keep it together. From the front of the unit, lift top shell and rotate left the CRT stays attached to that piece of the case you lift up You should now see the floppy cage on the right Remove all the screws from around the cage and the two drives should come out as a unit. If it is the original 16: Remove the two back screws from the case cover. Remove this. Remove all the screws from around the front (CRT) bezel. It should drop off, with the CRT attached. You should now be able to get to all of the screws If this is an original 16, please let me know when you list it. If you're interested in private sale, let me know. I'll send an offer that you can either accept or ignore. I wouldn't even ask you to clean the drives. If you need it, I can scan in an exploded diagram from the two service manuals. Kelly

17 years, 9 months

TRS-80 Model 16

by cclist＠sydex.com

I've got a TRS-80 Model 16 that I'm going to put on ePay, but I'd like to clean some of the grunge out of the half-height Tandon 8" diskette drives. In a nutshell, can someone tell me the easy way to remove these drives from the case? Thanks! Chuck

17 years, 9 months

Floppy drive box thingie; was: Re: Wow; $192 for a 5.25

by cclist＠sydex.com

As long as we're talking about it; here are a few more ideas to consider. 1. The Catweasel uses a selectable clock rate to obtain a clock count that will fit in 7 bits. My gripe with this is that I have to read a track or two (if different densities on the same disk) to determine the correct clock rate. There's little worse than finding out that you've guessed wrongly and your image is worthless. If we're going to employ a dedicated MPU/MCU to handle this stuff, why not go with a 10- or 11-bit clock rate and get rid of the rate selection? One of the spare bits could be used for index detection on hard-sectored disks. 2. Some drive diagnostics should be incorporated. Particularly with 5.25" drives, old sticky floppies can really drag the rotational speed down. I'd really like to know that it's happening. 3. I can envision this device as a small box, powered by a wall wart with an RJ-45 ethernet connector and on or two DC-37 female connectors for drives. Given that this thing's going to be used for all manner of drives, there's no compelling reason to provide drive power as part of it. 4. DHCP is a nice feature, but not all vintage networks support it. The option of a fixed IP address (192.168.x.x) would be a plus. 5. Should the box also supply the drive for older 8" drive 3-phase steppers? How about the head-load signal? That's it for now--I'm sure I'll think of something else! Cheers, Chuck

17 years, 9 months

Wang 2200

by wb6blv＠inreach.com

Looking for a WANG 2200 MVT system or anything that will read Wang 5 meg removable platters; 8 inch floppy drive also needed; have many of the Wang terminals but a spare mpu might be nice. Thanks John WB6BLV at inreach.com

17 years, 9 months

Intel BPK-72A-4

by cclist＠sydex.com

For collectors of arcana out there, I've listed an Intel bubble memory development kit on ePay: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320042426869&ssPage Name=ADME:L:LCA:US:31 I never got around to using it--after I discovered the power requirements of the thing, I moved on to battery-backed SRAM instead. :) Cheers, Chuck

17 years, 9 months

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test-drb October 2006