test-drb March 2008

test-drb@ccmp.vtda.org

209 participants
369 discussions

by cclist＠sydex.com

> Date: Sat, 08 Mar 2008 00:07:55 -0500 > From: "Roy J. Tellason" > Which reminds me, does anybody else remember those machines that had > multiple CPUs in them? Or the option of plugging different ones in? > Seems to me real early on there were some mfrs trying to find as much > compatibility as they could with pursuing options like that. I remember > one Taiwanese-made clone of an Apple II that had a Z80 on the main board, > and of course the c128 has that similar setup (though the way the hardware > was structured the z80 effectively ran at something like 2.5MHz). I > remember some other system where you could literally plug in different > processors for different uses, but the brand name isn't coming to mind at > the moment. Extremely common in the S-100 world (think Godbout/Compupro, Cromemco, etc.). Bill Godbout may have offered the widest range of processor boards from a single manufacturer. Early on, there were 6502 S-100 boards, but not very popular. There were other non S-100 vendors of optional CPU configurations. Didn't The Digital Group offer a choice in their boxes? Cheers, Chuck

16 years, 4 months

Apple ][/II/2

by healyzh＠aracnet.com

Here is an odd question for everyone. In a printed article, which would be more accurate? "Apple ][", "Apple II", or "Apple 2" Zane -- | Zane H. Healy | UNIX Systems Administrator | | healyzh at aracnet.com (primary) | OpenVMS Enthusiast | | MONK::HEALYZH (DECnet) | Classic Computer Collector | +----------------------------------+----------------------------+ | Empire of the Petal Throne and Traveller Role Playing, | | PDP-10 Emulation and Zane's Computer Museum. | | http://www.aracnet.com/~healyzh/ |

16 years, 4 months

Group buy of 1541-III PCB's?

by healyzh＠aracnet.com

I know there was some interest in 1541-III PCB's recently. Vincent Slyngstad and I have been discussing this since that time, and he has done up schematic in Eagle CAD and has the initial board layout done (actually three different versions using different SD Sockets). The big difference between this and the original design is that it uses through the hole parts wherever possible rather than surface mount parts. I'm trying to find out if anyone here will be interested in boards. I have a design question or two for anyone that is interested. Additionally, I'm looking for anyone familiar with SD Sockets, as neither Vince nor I are, and a couple questions have come up on the socket placement. Information on the 1541-III can be found at the creator, Jan Derogee's website http://jderogee.tripod.com/ Zane -- | Zane H. Healy | UNIX Systems Administrator | | healyzh at aracnet.com (primary) | OpenVMS Enthusiast | | MONK::HEALYZH (DECnet) | Classic Computer Collector | +----------------------------------+----------------------------+ | Empire of the Petal Throne and Traveller Role Playing, | | PDP-10 Emulation and Zane's Computer Museum. | | http://www.aracnet.com/~healyzh/ |

16 years, 4 months

Up for grabs: DECDataSystem (model not known), Lincs UK

by listmailgoeshere＠gmail.com

Hi list, In Skegness, Lincs there is a company called Ramco who deal with selling off military surplus via sealed-bid auctions. I've bought from them before. The only thing to bear in mind is that every item has a reserve, so it's not the case that if you bid ?1 and no-one else bids, you win. Now, on the latest tender list ( http://www.ramco.co.uk/tender-main.php ) the following appears: 328 PDP-11 DEC DATA SYSTEM Unfortunately only some of the lots have a photo, and this one doesn't. Everything they sell is in "as-is" condition, but a friend of mine buys from them all the time and almost 100% of what he gets does work. All the electrical/electronic gear I've ever bought worked. Just a heads-up in case anyone wants to go check this out and/or buy it. Ed.

16 years, 4 months

wondering what 'puter this is?

by rtellason＠verizon.net

http://ed-thelen.org/stories_tech.html#BIRDiE-Techie -- 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

16 years, 4 months

14-in disk platters (for 2N2/256-BSCP)

by bnansel＠bigpond.net.au

I've acquired some scrap 14-in drive platters. They're scuffed up (no real dings) and a touch corroded (more like stained), so I reckon I'll have to remove the oxide coating and recoat them. Any ideas how to remove the oxide coating, short of sanding? Should I recoat with oxide, or would nickel plating be better? In the Olden Days I understand they just painted the oxide goop on, perhaps spinning the platters to smooth it out. Also, the platters came as just bare disks, no spindles or hubs (or whatever; I'm pretty hazy what the mechanics of these large drives were). Any suggestions about finding or improvising a spindle/hub for these puppies? Unfortunately, the dimensions involved are a bit outside the capacity of my wee Taig lathe :) I've been scavenging VCR drum heads, and the bearings in these are pretty high-class, so perhaps they might be a start. I don't think the drum motor itself would have the grunt to turn a 14-in platter at the required speed, not without rewinding the stator and replacing the ferrite rotor magnets with Neodymium magnets. The folks who rewind CD-ROM motors to power electric RC planes might have a few tricks I could use. -Bobby

16 years, 4 months

Son of Motorola (or, the $20 CPU Chip)

by swtpc6800＠comcast.net

The November 1975 issues of BYTE magazine has a seven page article comparing the Motorola 6800 to the upcoming MOS Technology MCS6501 and MCS6502. The article was written by Daniel Fylstra based on a visit to MOS Technology in August 1975, a month before the announcement at WESCON. I have scanned it and placed a copy on my web site. This is a searchable PDF file (1880 KB). It would be nice if someone with a 6500 focused web site wants to host this file. I also have 300 dpi tiff files and a 8.5 MB high resolution PDF file of this article http://www.swtpc.com/mholley/BYTE/Nov1975/Son_Of_Motorola.pdf Here is an article from the Commodore site. Electrical Engineering Times. August 25, 1975. Does The Country Need A Good $20 Microprocessor? http://www.commodore.ca/gallery/magazines/misc/mos_605x_team_eetimes_august… Michael Holley www.swtpc.com/mholley

16 years, 4 months

6502 CPU schematics

by bnansel＠bigpond.net.au

> To woodelf... > > ... > Soldering a few thousand of them 3 legged critters doesn't seem like > that big of a job...compared to soldering 19,008 LEDs. : ) > > When I said I wanted blinkin lights for an Alitar, I took myself > seriously! : ) > Wow. Do you mean to emulate the [i]image[/i] of an Altair front panel? Um, that would be, what, a hardware virtual implementation? Oy, my head hurts... -Bobby

16 years, 4 months

Midwest Gaming Classic

by wgungfu＠csd.uwm.edu

>I think I'll spam for the Midwest Gaming Classic, as last year's event >had a significant classic computing component. I enclose the info >for this year's show at the end of this month, as well as the >description posted by a list member last year, and my last >post-show memories. > >- John Hi John, thanks. Yes, all the classic computing stuff is from my archive every year (so's all the pre-NES console material). I'm a co-organizer for the show, and I run the Museum area (huge hall). I post on here every year normally asking for people to come and display, but it always gets ignored. Maybe people think there's no room for retro-computing there because of the name of the show (its always been equally dedicated to classic computers, consoles, video-coin and pinball), or that there's to many kids (average age is late 20's through 40's). This year we will also have some of the Chicago Commodore show people coming to display as well as a Tandy CoCo related area. > >Midwest Gaming Classic > >When: >Saturday Mar 29, 2008 >at 10:00 AM > Actually, its that Saturday and Sunday (2 day show). 10-8 on Saturday, and 10-5 on Sunday. 20,000 square feet (every bit of it used), and usually pretty full of people (we had about 2400 in attendance over the 2 days last year). >Where:: >Olympia Resort and Conference Center >1350 Royale Mile Road >Oconomowoc, Wisconsin|50 53066 >United States And for those not familiar, this is just 45 minutes outside of Milwaukee. Its a major resort in the area, so anyone coming from out of town, its a great place for a family (or spouse). My wife is coming and using the spa all weekend (was just $10 for the entire room to use it last year). That's my payment for being able to do this for the whole weekend and her dealing with all my "stuff" monopolizing things things during that time (though she calls it something other than stuff). ;) Marty

16 years, 4 months

Wanted: Xyplex MX1710 documentation

by tiggerlasv＠aim.com

I'm have been trying (unsuccessfully) to locate documentation for a Xyplex MX1710 TCP/IP LAT Gateway. Naturally, I've tried the Xyplex website, which still has some of the software, but the documentation they have listed under the 1710 heading is generic access server information for totally unrelated hardware; nothing 1710 specific. I have also contacted Xyplex (MRV), and was told that since it was no longer supported, they wouldn't do a document search for me. I'd be happy to pay reasonable scanning/copying/mailing fees. Thanks in advance for your help ! T

16 years, 4 months

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test-drb March 2008