test-drb June 2007

test-drb@ccmp.vtda.org

224 participants
486 discussions

by grant＠stockly.com

This is my attempt at an "art" x-ray. This image includes the entire range of densities. If I were to penetrate the motor I would blow through the plastic. This is a high resolution x-ray. Zoom into the front label and see if you can read the embossed name plates... What COLOR is this actual drive? The answer is in there! ; ) http://www.stockly.com/images2/061231-Disk_II_Drive-120kv6ma15msDG35SFD.jpg This shot was taken with the drive elevated at an angle by foam so that you would get a 3d feeling and not a flat picture. Let me know if its cool. I may x-ray an entire computer next... : ) Grant

17 years

OT: demagnetization

by aliensrcooluk＠yahoo.co.uk

How did you magnetise them and what little parts are you referring to? - Andrew B (via mobile phone) --- cctalk-bounces at classiccmp.org <dgriffi at cs.csubak.edu> wrote: > > Can someone point me to schematics for a decent homebrewed demagnetizer? > I've accidentally magnetized a bunch of little parts that really shouldn't > have been. > > > -- > David Griffith > dgriffi at cs.csubak.edu > > A: Because it fouls the order in which people normally read text. > Q: Why is top-posting such a bad thing? > A: Top-posting. > Q: What is the most annoying thing in e-mail?

17 years

Floppy Disc Capacities [was Pictures of My Machine Room (So Far)]

by wayne.smith＠charter.net

> Date: Mon, 18 Jun 2007 13:50:43 -0400 > From: Sridhar Ayengar <ploopster at gmail.com> > Subject: Re: Pictures of My Machine Room (So Far) > To: General Discussion: On-Topic and Off-Topic Posts > <cctalk at classiccmp.org> > Message-ID: <4676C5F3.40609 at gmail.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Roy J. Tellason wrote: > > On Sunday 17 June 2007 17:26, Fred Cisin wrote: > >> Oh, well. I guess that it is like selling disks based on their > >> unformatted capacity - a 2.8M ED disk is called "2.88" by IBM, and > >> was called "4 meg" by NeXT. > > > > I have some boxes that had "1.44s" in them branded IBM and > which were > > labeled "2.0MB"... > > Indeed. All of the IBM 2.88's I have are labeled 4.0MB. > > Peace... Sridhar > My first iteration of Windows 95 was on 3.5 inch floppy diskettes. At some point, I wanted to make a backup copy on diskettes but couldn't because the file sizes of the Windows distribution floppies was 1.8-1.9MB each. At the time I thought it was some sort of copy protection. I assume they must have been able to format the discs for a higher capacity - close to 2MB. Does anyone know how?

17 years

Trouble with HP 59309A Digital Clock

by vp＠drexel.edu

"Pat Walsh" <PWalsh at energysolutions.com> wrote: > Just got one of these for a desk clock and need to > know how to set the calendar addressed setting. Hi, I have the manual but I won't be able to get to it for 1-2 months (wrong continent :-). Do you want to know how to use it, or how to repair it? The manual tells you both. NOTE: Before you use it be sure to open the clock to check if the backup 9V battery is still inside. If so, you will hve a lot of cleaning to do. Use lemon juice or vinegar to clean things up. Using it as a desk clock is easy, you jsut power it up, open the metal flap under the display on the front. You then press reset to clear the clock and press the buttons to set he correct day of the year and time. There is also a switch called INT/EXT (or smth) move it to the INT position (internal time reference) If you intend to keep the clock mostly powered off, do not bother to install a battery inside, it will suck it dry in a day or two. Controlling it via the HPIB is also easy, you just send a string over HP-IB to set it and thn you can simply trigger it to read the time. Also check the underside of the clock, it should contain instructions on how to address it and set it remotely. Its pretty easy, depending on what kind of HPIB controller you have. E.g. on the Series 80 you read it with smth like INPUT 706, A$ and set it with , say, OUTPUT 706, "RPDDDDDDDDDDDDHHMMMMMT" R: reset clock DDDDDDDDDDDD: advance teh day to the 12th of the year (Jan 12) HH: advance hour to 2am MMMMM: advance minute to 5, T: start clock at 02:05 on Jan 12 This assumes that the clock is strapped as unit 6 of the HP-IB bus. Most of the above is from memory (just looking at the underside of my 59309A), so there may be some errors. **vp

17 years

NorthStar Horizon Case Cover Replacements

by ajp166＠bellatlantic.net

> >Subject: RE: NorthStar Horizon Case Cover Replacements > From: "Chuck Guzis" <cclist at sydex.com> > Date: Wed, 20 Jun 2007 13:56:02 -0700 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >On 20 Jun 2007 at 8:49, Allison wrote: > >> What made the box notable was floppies in the crate rather than external >> box and only a LED (power on) on the front pannel. It was one of the early >> turnkey systems and became popular with applications/system integrators >> for that reason. The reason being it was now possible to sell a small(then) >> system that was powerful enough to be a complete office accounting system. >> It didn't hurt that the wood cover fit into office decor of the time. >> The wood disappeard when FCC started forcing RFI constraints. By RFI I mean the kind of interferfence from the disgital switching action that could blanket communications bands. >There was a good reason for that. A friend had purchased one of the >Integrand S-100 boxes with a floppy cutout. He'd installed an SA-400 >(IIRC) and complained that it wouldn't work reliably. What I >discovered was that the field from the large power transformer was >playing hob with the drive electronics. I installed a substantial >steel shield around the floppy and the problem abated. NS* Horizon never had a transformer magnetic field problem. And the drives are only a few inches from the transformer. The problem may have been the CVC transfomer used in some Integrand boxes. Those radiate a larger magnetic field. > >When I purchased my own Integrand box, I opted for the drive-less >model. > >Even on the Durango box, we had to shield both the drives and the >small monitor that sat over them to get reliable drive operation. > I have an NS* Advantage and they also apparently did it right as the drives behave well without steel shield plates. Allison >Cheers, >Chuck

17 years

T11 design WAS - Re: Inside old games machines, was: Re: Simulated CP/M-68K?

by ajp166＠bellatlantic.net

> >Subject: Re: T11 design WAS - Re: Inside old games machines,was: Re: Simulated CP/M-68K? > From: woodelf <bfranchuk at jetnet.ab.ca> > Date: Wed, 20 Jun 2007 22:18:57 -0600 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >Roger Ivie wrote: > >> I don't know anything about the internals, so I can't say. Although >> AFAIK core was pretty much gone by the time the T-11 happened, it may >> have been based on an earlier design that did interface to core. >I think a read modify write may have made Dynamic ram interface simpler. > No. RMW was PDP11. However some instructions would read, alter the value and write it back. Very useful for autoincrement addressing. It also had to be that way to be compatable with ALL previous PDP11s. Allison

17 years

Massbus simulation

by jam＠magic.com

> Guy Sotomayor wrote: > > > > > > Dave McGuire wrote: > >> On Jun 20, 2007, at 2:49 PM, Ethan Dicks wrote: > >>>> > Even so, I'd think the most obvious consumers of a new Massbus > >>>> > storage device would probably be either the 11/70 crowd, or, more > >>>> > >>>> Indeed. My 11/70 has RP06s. > >>> > >>> Mine have SI9900s, but I'd love to throw an RH70 in one. > >> > >> I've got a pair of Emulex SC72s for mine...The SC72 is a set of > >> boards that plugs into the RH70 slots in an 11/70, and controls SMD > >> drives. I've not installed them yet, but I expect them to be very nice. > > > > They *are* very nice. I have 2 sets in my 11/70. One for controlling > > the Eagles and the other for the CDC 9766's. > > > > I have a couple of SC72s which I hope to use in my 11/70 to hook up > both my CDC 9762, Fujitsu M2284K, and a pair of Seagate (CDC) 9720 Sabre > drives. I'm hoping that the SC72 can handle the data rate of the Sabres. > Does anyone know? I have an SC70 in my 11/70 and a couple of RH70's. I've also got one complete RH11. But, no Massbus peripherals, so I cannot test those out. I'm looking forward to Guy's emulator! RL02's just aren't big enough for real work on an 11/70. James Markevitch

17 years

T11 design WAS - Re: Inside old games machines, was: Re: Simulated CP/M-68K?

by ajp166＠bellatlantic.net

> >Subject: Re: T11 design WAS - Re: Inside old games machines,was: Re: Simulated CP/M-68K? > From: "e.stiebler" <emu at e-bbes.com> > Date: Tue, 19 Jun 2007 09:52:25 -0600 > To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> > >Robert Borsuk wrote: >> I've been loosely following this thread and never heard of a T11 from >> DEC. So good'ole Google and Bitsavers saves the day, but it get's me >> thinking. Has anybody done any design's with this processor? Why >> wasn't this processor used instead of the 6100? >> >> Rob > >There is a guy who made his own SBC with a T-11, and even ported Forth >on it. I thought I knew his webpage, but it seems, I lost the bookmark. >But check google groups for "peter mccollum forth t11" and you will find >at least the discussions ... It's an easy cpu to interface and use. One of it's features is that at reset the bus can be configured for 8 or 16 bit wide path, for standard or varible microcycle and static memory or Dram(with refresh). I'd suspect the Dram support would be valuable in a game at a time when large rams were dynamic. Allison

17 years

Emulating old computers on FPGA

by lproven＠gmail.com

Since I see this is coming up, I though folk might be interested in this: http://www.msx.org/One-Chip-MSX-MKII.newspost3805.html Of course, there is also the lovely Jeri Ellsworth's C-One: http://c64upgra.de/c-one/ -- Liam Proven ? Blog, homepage &c: http://lproven.livejournal.com/profile Email: lproven at cix.co.uk ? GMail/GoogleTalk/Orkut: lproven at gmail.com Tel: +44 20-8685-0498 ? Cell: +44 7939-087884 ? Fax: + 44 870-9151419 AOL/AIM/iChat: liamproven at aol.com ? MSN/Messenger: lproven at hotmail.com Yahoo: liamproven at yahoo.co.uk ? Skype: liamproven ? ICQ: 73187508

17 years

strange Televideo terminal? in Belgium (eBay)

by chrism3667＠yahoo.com

http://cgi.ebay.com/VINTAGE-TELEVIDEO-PT-100_W0QQitemZ230140614394QQihZ013Q… ____________________________________________________________________________________ Get your own web address. Have a HUGE year through Yahoo! Small Business. http://smallbusiness.yahoo.com/domains/?p=BESTDEAL

17 years

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test-drb June 2007