test-drb June 2006

test-drb@ccmp.vtda.org

220 participants
447 discussions

by chrism3667＠yahoo.com

what about compact flash drives, which are IDEish in nature. Im all for authenticity, but if a solution presents itself, and Ill add one that may not be as volatile as magnetic media, Im equally gung-ho. Hey lookit, I just became a ho LOL LOL. Albeit cflash cards are themselves being phasored out (in favor of the smaller sd and xd nuisances). But theyre very cheap too...128megs ~ $10. Or 1gig for 25 after a rebate. --- cctech-bounces at classiccmp.org <ard at p850ug1.demon.co.uk> wrote: > > > So (to get it on-topic for classiccmp), people with machines that > > > only support IDE drives are going to have problems in the future > > > finding working replacements (I doubt very much if any of us could > > > repair any reasonably-modern IDE drive, alas). I've seen adapters to > > > use IDE drives on SATA hosts, but not the reverse. > > > > FWIW, all of the failures I've seen in an IDE drive were failures in the > > HDA, not in the electronics. "Boardswapping" a new board onto most IDE > > Sure, but the HDAs are not exactly home-repairable either. > > > drives is trivial if you have a couple spares of the same drive, if > > there's really a problem with the electronics. I know that may not > > But as you said, the electroncis is rarely the problem. > > One caveat in doing this is that I beleive some drives stored HDA > parameters (bad block lists, etc) in non-volatile memory on the logic > board. Swapping boards between seemingly identical drives won't always work. > > > appeal to you, Tony, but most of us don't have the ability or spare > > time to repair surface mount electronics... :) > > Having looked at some IDE drives I am not sure I do either. Very fine > pitch connections (tht I probably could solder if I had to) and nasty > ASICs that I can't get and don't understand. I would attempt to replace > standard components if I could prove that was the problem. > > > > > Anyhow, there's enough new products being designed with IDE hard drives > > in them, that IDE will still be around for at least 5 years if not > > much, much more... > > 5 years is not that long. > > -tony > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

18 years, 1 month

atari printers

by pete＠dunnington.plus.com

On Jun 3 2006, 0:41, Tony Duell wrote: > On Jun 2 2006, 9:32, Joe R. wrote: > > I've seen a crude but effective method of cutting gears by > > turning a shaft of the desired od and then mounting it horzontally > > on a verticle milling machine so that it can turn freely. Then > > mount a TAP vertiaclly in the headstock and spin it slowly and > > then moving it slowly in against the shaft. > THis is related to a gear cutting method called 'hobbing'. A real > hobbign machine has the blank mounted on a spindle that's geared to > the cutter spindle by the appropriate ratio. And you use a hob, not > a tap -- the differenece being that the cutting edges are a > different shape. > > The advantage of this method is that you only need one cutter for a > particular pitch of gear, no matter how many teeth you want to cut. > > If you use the other method you've suggested, you, in theory, need a > different milling cutter for each number of teeth, since you're actually > cutting the spaces between the teeth (not the teeth themselves), and the > shape of the space varies with the number of teeth on the gear. In > practice, there are typically 8 cutters to cover the range from 10 teeth > to a rack (the last one typically goes from 135 teeth upwards, all the > way to a rack which is an 'infinite number of teeth' if you think about > it). But those cutters are not cheap -- I've been quoted \pounds 45.00 > each (not for a set of 8, for one cutter) for the sort of size you'd need > here. There's a third method which gives reasonably-shaped gear teeth, but only needs one cutter. It's based on the idea that the teeth in a rack are straight-sided. The cutter is like a short length of a rack (think of the side view) rotated around its long axis to make a cylindrical cutter. It's easy to make such a cutter by turning a bar in a lathe, using a V-point tool to cut the valleys so you end up with something like a ribbed cylinder. Then mount the cylinder in a dividing head, and mill or cut narrow slots along the length to form the front faces of the teeth, and finally apply some relief to these teeth by milling or grinding away part of the back of each. _ _ _ _ _ _ / \_/ \_/ \_/ \_/ \_/ \ side view | |__ | _ _ _ _ _ _ _ _ _ _ _ _ _| _ _ _ _ _ _ _ _ _ _ _ _ _ <-- hole through centre for arbor | __| | _ _ _ _ _ | \_/ \_/ \_/ \_/ \_/ \_/ You mount the cutter on an arbor (easiest to make it that way to start with), and put your gear blank under it in a dividing head, such that it will cut both sides of what will be the uppermost tooth (with a normal cutter, you form one gap at a time between two teeth, with this you form the two sides of one tooth between two gaps). You'll find that for gears with a reasonable number of teeth, it cuts one tooth in the centre to full deptth, but cuts part of the teeth to either side, and for large gears, two more either side of those. The point is that as you cut one tooth, the ones either side get their profiles modifed to something much more like an involute form than a straight form. It works well, and I've cut replacement gears for a few things like that, mostly out of nylon, brass, or aluminium. It doesn't give a perfect involute tooth form, of course, but it's close enough for most purposes. If you want a better shape, you can smooth out the curves with a swiss file. -- Pete Peter Turnbull Network Manager University of York

18 years, 1 month

TRW Swap Meet, was Re: Semi-OT: IDE & SATA to USB "dongles"

by marvin＠rain.org

I'm from Santa Barbara (close enough though) and have been attending the TRW swap meet for about the past 10 years or so. I share a couple of spots with CARA in G22/G24, so chances are we've seen/met each other but I am not putting a face with a name right now :). The next one in June is Field Day weekend, but I do plan on being there. So stop by and say hi!!! > From: "Billy Pettit" <Billy.Pettit at wdc.com> > Last weekend was at the TRW flea market. Anybody else on the list from the > LA/OC area? Let me know. Maybe we can meet up at the next one. (I scored

18 years, 1 month

Pens for Atari, CBM and TRS plotters (was: atari printers)

by marvin＠rain.org

Something I haven't tried (yet) but is worth a shot is to use the same ink used in stamp pads since that is easily available and it is available in a variety of colors. > From: "Chuck Guzis" <cclist at sydex.com> > One solution might be to obtain the ink and pen from a strip recorder and > fit it to the plotter. These don't dry out as quickly and can be easily > unclogged with a small cleaning wire. > > Cheers, > Chuck

18 years, 1 month

parts pages updated

by Billy.Pettit＠wdc.com

Roy J. Tellason wrote: Hopefully some of you folks might find this useful... ----------------------------------------- Billy: Roy, I think you've done a grand service here and I've already used some of the data sheets. I have a book shelf in the garage full of Data Manuals going back into the 60's that need a good home. Much too heavy to ship. I talked to Al K. about them, but from his quietness gathered that he has a garage full of them too. Do you live near the Bay area? Anything special you want to continue the good work? There would be no cost of course. I love to see good work like your and want to help if I can. Billy

18 years, 1 month

TRS-80 plus other electronics available in Houston.

by tosteve＠yahoo.com

Group, I received this from Allison - respond to her, not I. --------------- "From my uncle's estate, we have, at least, the monitor for the TRS-80. I'm sure as we continue to go through his belongings, we will find the rest of the computer as he kept everything. We are in Houston, Texas and am trying to find someone who is interested in owning it. (We have lots of other miscellaneous electronic equipment from the estate, too. My uncle saved everything!) Please let me know if you know of anyone in our area who is interested in a TRS-80. Sincerely, Allison Hardman <allison at condongardens.com> __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

18 years, 1 month

atari printers

by dm561＠torfree.net

----------------Original Message: Date: Wed, 3 May 2006 00:28:55 +0200 From: "arne graff" <dsl289031 at vip.cybercity.dk> Subject: atari printers Looking for a small plotter I was directed to one of your sites. Do you know anywhere I could get hold of a Tandy CGP-115 new or used? Regards Arne Graff ------------------Reply: I've got one: very slightly used, boxed with PS, manual & dust cover. Also extra rolls of paper and 3 or 4 sets of pens, although, except for 2 black ones, they're dried out by now. Contact off-list if interested. BTW: Anybody have any experience reviving/replacing this type of pen? (Just stubby little ball-points, also used in several other plotters of the day). mike

18 years, 1 month

parts pages updated

by rtellason＠blazenet.net

I've updated my parts pages again, and this time pretty near all of the datasheets are online as well. They can be found at: http://www.classiccmp.org/rtellason/parts-index.html Hopefully some of you folks might find this useful... -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters" - Information is more dangerous than cannon to a society ruled by lies. --James M Dakin

18 years, 1 month

MO support

by geoffb＠vigilan.com

MO drives came in at least three major variations, distinguished by media: originally up to 520MB or so with 512 tracks then 680MB and beyond with 1024 byte tracks, and here's where the first OS issues occurred when they didn't inherently handle 1024 byte tracks-- solution: you need an updated driver AND usually a special formatting utility to format the disk. More recently there were multi GByte disks that were 5" or 5 1/4" or so too (obviously with a different drive mechanism). The 3 1/2" originals look like a thicker 3 1/2" floppy (still with rigid plastic case). All the MO drives I've used have had a SCSI interface and have worked very well. Another application was with the military due to rugged design and data integrity: the MO disk had to be written with both a laser AND magnetic head. The laser was used to spot heat the MO material and the magnetic head wrote the bit in place. It is the reason why they are much less susceptible to erasure or bit drop due to magnetic field interference. Some MO providers still have the drives available for download on the net and through their support chains. Hope this is of help. Geoff

18 years, 1 month

New Exidy Sorcerer stuff

by nospam212-cctalk＠yahoo.com

Sweet! Got back into town to discover an Exidy Sorcerer waiting for me. System, S-100 expansion, dual 8" floppy drives, monitor and software and docs. I love the Sorcerer! :) List of stuff so far can be found at: http://www.trailingedge.com/exidy/ExidyList.txt ----- David http://www.trailingedge.com

18 years, 1 month

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test-drb June 2006