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101090 discussions

Almost free 2-port and 4-port fanouts, IEEE 802.3 compliant, Ethernet Version 1.0 and 2.0 compatible AUIs

by pete＠dunnington.u-net.com

On Mar 21, 15:24, Jim Strickland wrote: > Couldn't they be used to divide a termination domain? IE the multiport > transceiver sits between two branches of a thin-net network, protecting against > loss of termination on either branch? Obviously they'd still be in the same > collision domain... I don't really see how the fanout units on offer (or my unsuccessful back-to-back device) could do that -- the termination isn't in the transceiver or fanout unit, it's a resistor on the end of the cable. Anyway, it would still only be one termination domain. Or maybe I've misunderstood what you mean? If you mean my back-to-back transceiver idea, yes, if it had worked, you could use it to split a termination domain into two, just like a two-port repeater, or a very simple bridge (except a bridge usually separates collision domains too). -- Pete Peter Turnbull Dept. of Computer Science University of York

26 years, 1 month

Almost free 2-port and 4-port fanouts, IEEE 802.3 compliant, Ethernet Version 1.0 and 2.0 compatible AUIs

by whdawson＠mlynk.com

Thanks for the responses. It looks like all are spoken for. If I end up with any left, I'll repost them. Bill whdawson(a)mlynk.com

26 years, 1 month

Are you sure the 6550 is dead? (was: Mos Technology RAM wanted)

by ethan_dicks＠yahoo.com

--- Pete Turnbull <pete(a)dunnington.u-net.com> wrote: > On Mar 21, 21:48, Tony Duell wrote: > > > else, long before I posted my request. I could fix about anything > else on > > > the PET, but I draw the line at grinding the top off to poke at > individual > > > flip-flops in an IC :-) FWIW, the first job I had in > > > > Really, kids these days..... > > Well, I once ripped the metal lids off a few ceramic DRAMs to use them as > optical image sensors (ISTR an article in BYTE, I think it was, years ago > about that) Yes! I just repacked my lidless 4116 chips. I only ever got as far as cementing slide-mount covers on one and sticking it in an Apple II at the top of RAM and demonstrating the effect by clearing video RAM then lifting the lid. Many bits sparkled in when light shone on the chip. Now that I have a digital camera, I'll have to take pictures (as soon as I buy/find/make a Mac crossover cable to connect a QuickTake 150 to my Mac). -ethan ===== Even though my old e-mail address is no longer going to vanish, please note my new public address: erd(a)iname.com The original webpage address is still going away. The permanent home is: http://penguincentral.com/ See http://ohio.voyager.net/ for details. __________________________________________________ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com

26 years, 1 month

Spartan emulator

by ethan_dicks＠yahoo.com

--- Mark Gregory <mgregory(a)vantageresearch.com> wrote: > I don't know how they got there, but I remember seeing a large pile of > these Spartans at Active Surplus, on Queen Street in Toronto (well-known to > any Hogtown hackers) in late '88 or '89. Given Active's inventory policy > ("If you don't buy it, we'll leave it lying around") they may still be > there. If anyone researches this, please let me know. > From: Cameron Kaiser <ckaiser(a)oa.ptloma.edu> > To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> > Date: Tuesday, March 21, 2000 4:48 PM > Subject: Re: Apple Network Servers > > > > I'm also particulary impressed with the Spartan page on your site (for > > those in the dark, this was a hardware add-on for the Commodore 64 that > > turned it into an Apple II): I was a beta tester for the Spartan in 1985. Somewhere I've still got my contract with them (all I could find on a casual search of my bookshelves is a copy of the docs). I have the case for one in the basement; I forget what happened to the mainboard. I think it died, or else I wouldn't have stripped the supply for another project. During my testing, I remember running Enchanter on the Apple CPU and Sorcerer on the C-64 CPU, typing a command on one, switching to the other and typing a command there to multi-task the games (since the disks were so slow). Interesting concept, but about 50% the cost of a real Apple. If they ever sold any, it would have been to some serious die-hards. Mostly back then, Apple guys and Commodore guys didn't mix much. Kinda like Atari guys and everybody else. :-) -ethan ===== Even though my old e-mail address is no longer going to vanish, please note my new public address: erd(a)iname.com The original webpage address is still going away. The permanent home is: http://penguincentral.com/ See http://ohio.voyager.net/ for details. __________________________________________________ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com

26 years, 1 month

3com 3server3

by mmcfadden＠cmh.edu

I just came across a wierd computer box. It is labeled 3com 3server3 and has a dc-300 cartridge tape drive it it. I haven't opened the box yet. I looked on the 3com website and it says that it is a PC server from 1984. Does anyone know anything more? TIA Mike michaelmcfadden(a)sprintmail.com

26 years, 1 month

Are you sure the 6550 is dead? (was: Mos Technology RAM wanted)

by pete＠dunnington.u-net.com

On Mar 21, 16:45, allisonp(a)world.std.com wrote: > > > I would have thought a 2101 was far too small. These are 4kbit chips. > > Are these single voltage or multiple? 4k? 22pin? sounds like the > semi-4600 and NEC D410 parts, a 4k pseudostatic 200ns cycle and access > under 120ns. I've got a rat load of upd410s. The moto part number > doesn't compute though. uPD410 is 18-pin 0.3" width, 4k x 1, with one ~CE line (the MOS Technology MCS6550 has 2 ~CS and 2 CS lines and it's 0.4" wide). I can't find any data on a 4600 but I assume it's similar. If you're asking about the 6550 I'm looking for, yes it is single 5V rail, but it's 1k x 4 and it's not Motorola. In fact, I'm fairly sure no-one but MOS Technology made them. -- Pete Peter Turnbull Dept. of Computer Science University of York

26 years, 1 month

Televideo TS-802H available

by donm＠cts.com

A friend of mine has a Televideo TS-802H that he is looking to part with. I was familiar with the machine a few years back, and I'm sure that it is still in good shape. If you are interested, contact Dick Hubbard at 619-229-0955. He will be pleased to hear from anyone who might like the machine. - don

26 years, 1 month

Spartan emulator

by mgregory＠vantageresearch.com

I don't know how they got there, but I remember seeing a large pile of these Spartans at Active Surplus, on Queen Street in Toronto (well-known to any Hogtown hackers) in late '88 or '89. Given Active's inventory policy ("If you don't buy it, we'll leave it lying around") they may still be there. Cheers, Mark. -----Original Message----- From: Cameron Kaiser <ckaiser(a)oa.ptloma.edu> To: classiccmp(a)classiccmp.org <classiccmp(a)classiccmp.org> Date: Tuesday, March 21, 2000 4:48 PM Subject: Re: Apple Network Servers > >I'm also particulary impressed with the Spartan page on your site (for those >in the dark, this was a hardware add-on for the Commodore 64 that turned it >into an Apple II): I thought it was just a hardware emulator, but its feature >set was really greater than the sum of its parts. Fascinating! > >-- >----------------------------- personal page: http://www.armory.com/~spectre/ -- > Cameron Kaiser * Point Loma Nazarene University * ckaiser(a)ptloma.edu >-- SOFTWARE -- formal evening attire for female computer analysts. ------------ >

26 years, 1 month

Toggling in PDP-11 Bootstraps...

by pete＠dunnington.u-net.com

On Mar 21, 14:33, Aaron Christopher Finney wrote: > Thanks Pete, I'll give this a try when I get home tonight. And thanks for > putting the comments in as well! It's nice to see what's going on, that's > kind of what I'm after by playing around with this stuff this way. I've stuffed a few other things on my web site at http://www.dunnington.u-net.com/public/ODT/ A few of the files are bootstraps taken from handbooks or manuals, but several of them are little bits of nonsense I wrote when I first encountered an 11/23, with no OS. Remember I was a beginner and try not to laugh out loud :-) If you think the syntax is a little non-standard, it's because I had to write my own cross-assembler and I hadn't used MACRO-11 much then. No, don't ask me for the source. It was so awful I threw it away :-) -- Pete Peter Turnbull Dept. of Computer Science University of York

26 years, 1 month

Apple Network Servers

by owad＠applefritter.com

>::What "is" a network server 500, and what is the upgrade (very unlikely to >::be worth $200)? > >A Network Server 500 is one of Apple's two ill-fated Unix server models. Not to mention thge _very_ ill-fated Apple Networ Server 300, which never made it past the prototype stage. My web site, Applefritter, is hosted on one of these machines. "The ANS 300 had the same architecture as the 500 & 700, but was intended to be an easily rack-mounted unit intended for Internet/FTP/Mail/Web serving, departmental and small database servers, etc, and consequently less expansion. It has two removable drive bays and one fixed drive (behind the LCD). Much of the serviceability & security was abandoned for the sake of size. For instance, there is no obvious way to secure the drive bays, or the motherboard tray from being removed. The power supply is fixed and would be slow to field repair. The fixed hard drive mounted behind the LCD is very hard to reach, etc. The key lock on the front controls only the "on, lock, service" options, unlike the multiple key lock controlling those functions plus doors and security on the full size 500/700 units. These issues eventually ceased to be important, however, as the ANS 300 never shipped. "Code named Deep Dish, the ANS 300 is essentially an Apple Network Server without the large drive array. As a consequence, the computer is only four rack-units high. The logic board is in the bottom of the unit on a slide-out tray. There are two standard ANS removable trays on the right side of the unit's front. The Deep Dish also has one fixed internal drive, and the floppy drive is fixed, as well. Apple also had plans to produce an external drive array for the machine, reason for the ultrawide SCSI port above the PCI slots." If anybody wants more information, see <http://www.applefritter.com/prototypes/deepdish/>. Tom ------------------------------Applefritter------------------------------ Apple Prototypes, Clones, & Hacks - The obscure, unusual, & exceptional. ---------------------<http://www.applefritter.com/>---------------------

26 years, 1 month

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