test-drb

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101090 discussions

by oajones＠bright.net

I've always wanted to ask this question. How is a microprocessor made? Can someone here on the list answer this question? --Alan oajones(a)bright.net

27 years, 10 months

In case you thought Ebay couldn't get more ridiculous...

by aaron＠wfi-inc.com

What the fu... http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=37155064

27 years, 10 months

Starting from Scratch (was Re: OT: Modern college educa

by pete＠dunnington.u-net.com

On Oct 24, 9:53, Sam Ismail wrote: > Subject: Re: Starting from Scratch (was Re: OT: Modern college educa > On Fri, 23 Oct 1998, Ethan Dicks wrote: > > > can provide one. It depends on logical statements working as follows: > > The statement C=(A>B) would set C to 0 if A weren't greater than B, and > > would set C=-1 if A were greater than B. Not all micro BASICs support this. > > I'm pretty sure Applesoft is onethat does _not_. > > AppleSoft would logically return a +1 for the above statement rather than > a -1. Why the PET returns a -1 is beyond me. Couldn't they have added > one more machine instruction to strip off the sign bit? The PET is actually following the more common convention. The bitwise complement of 0 (all zero bits) is -1 (all one bits), at least in a 2's-complement environment. -- Pete Peter Turnbull Dept. of Computer Science University of York

27 years, 10 months

old IBM calculator

by maxeskin＠hotmail.com

Today, I briefly attended an Earthwatch conference at the Harvard Science Center. It wasn't as good as it could have been, but what was interesting was the IBM Automatic Sequence-Controlled Calculator, Mark I. This was apparently used by Harvard since 1946 or so. Now, it's in the lobby, or at least most of it. It's an electromechanical machine, no electronic components. Very fun to look at! The plaque said that in modern terms, it would have been 52 Hz and 1.7K RAM. It has one constant panel (dozens of rotary switches), an enormous array of relays, a missing multiplication module, a paper tape module (for output), a paper tape sequencer module (input), two typewriters (input and output), and a punched card device. It was shut off, except for flourescent lights, but I bet it could probably run...it was about 2 m tall and less than 1 m deep. The photos showed that it originally had a lot of pulleys on the back for dealing with paper tape. It is driven by a motor shaft that extends through the whole machine, spinning at 4 rpm. This acted as a clock and drove the tape mechanisms. Seems very easy to use, with proper instructions. I wouldn't mind having this in a hypothetical basement. On the plaque, it says it was used for ray tracing for lens design. Just thought someone would like to know :) ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

27 years, 10 months

Starting from Scratch (was Re: OT: Modern college educa

by pete＠dunnington.u-net.com

On Oct 23, 16:03, Hans Franke wrote: > >> My Lord Hammurabi, I beg to report to you that this year we > >> have produced 1,000 transistors and 400 rallods of copper > >> wire. > > Surplus shops have taken 215 transistors. > > Do you want to buy or sell source code? That brings back some fond memories :-) > Where is my copy of '101 basic games' ? Probably same place mine went: loaned, not returned. I still have ":More BASIC Computer Games: 84 Fabulous Games for Your Personal Computer", though. -- Pete Peter Turnbull Dept. of Computer Science University of York

27 years, 10 months

More thoughts on building a Z-80 (64bit!!!)

by ard＠p850ug1.demon.co.uk

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27 years, 10 months

More thoughts on building a Z-80 (64bit!!!)

by allisonp＠world.std.com

< I have made double-sided boards that ran at 100MHz+. The trick was to us < (a) one side entirely unetched as a ground plane, (b) design all the < tracks as striplines, (c) know the characteristics of the PCB material, < (d) use 100% SMD components with the shortest possible ground < connections, (e) use carefully designed twisted pair lines to carry < signals about if you couldn't route the tracks, (f) terminate everything < properly and (g) take a lot of care and think about what you are doing. (h) accept lower component density on the board to do that. It's very doable but, a 4-6 layer makes it so much less painful for a production system. Allison

27 years, 10 months

Starting from Scratch (was Re: OT: Modern college education

by hhacker＠gte.net

I do not need to have messages like this sent to me dozens of times! William R. Buckley -----Original Message----- From: Ethan Dicks <erd(a)infinet.com> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Friday, October 23, 1998 5:50 AM Subject: Re: Starting from Scratch (was Re: OT: Modern college education >> >> > You play the game like this: >> > 1) Scout for a surface deposit of Coal and start mining coal. >. >.

27 years, 10 months

Bid list

by fauradon＠pclink.com

Can you tell us more about the type of auction this is? Is it one of those auction where you can walk away with a pentium for $5 or is it more of the upper type wher you pretty much have to be within 105 of the retail valu in order to win it? Have you had any experience with this sort of auction? What I'm getting at is I've seen a few things on the list that I like but hve no idea what to bid on them. Also it seems like the terms for payement are very tight 2 days to send the money or you're out how do you propose to proceed? Are you going to send a "big" check for the bid and hope that everybody follow up on their bid? Thank you for the post. Francois ------------------------------------------------------------- Visit the desperately in need of update Sanctuary at: http://www.pclink.com/fauradon/ >I am on a major computer manufacture's surplus equipment bid list. >The list that came out today has a lot of equipment that would be of >interest to people on this list. >I am not interested in making any money from this all that I ask is that all >costs will be covered. I will have to pay the shipping from them to me and >that will needed to be figured into the final cost. I have just spoken to >Bruce Lane about this and he is putting it on his web site. I would also >ask that anyone that is interested in putting in a bid just email me with >the line of interest and $ they want me to bid per unit. You can bid on any ># up to the quantity listed. Please include your Phone # In case of any >questions. >If there are multiple bids on one item I will try my best to use the time of >the bid to >choose priority. I have no intention of making any money from this and hope >people will understand if I get flooded I may have to cut things off. >To give me time please let me know of any interest by Sunday Oct. 25 to give >me time to reformat and sort everything for sending in the final bid by noon >Monday. > >Also please keep any phone calls to before 10:00 PM eastern time. I try to >keep peace with the wife :) >Thanks >Dan Burrows >336-376-0468 >dburrows(a)netpath.net > > >

27 years, 10 months

ZILOG article in South China Morning Post

by thomas＠0000000.com

Hi, Since I was sorta plugging using the Z180 in consumer electronics earlier today and this thread about the Z80 is running around, I tho't I'd post this link. The article covers Zilog history in brief and where they think they're headed. Zilog has been plugging the Z8 for awhile but I think the Z180 represents the company's real family jewels. Thomas ---- Revamped Zilog aims for the top in chip markets ------------------------------------------------------- http://www.scmp.com/news/template/Tec-Template.idc?artid=19981019192016031&…

27 years, 10 months

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