test-drb

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101090 discussions

by allisonp＠world.std.com

< <> And (though no doubt I'll find I'm wrong when I look at those web pages <> I thought Z3 was a relay machine, not electronic. < <> [Distinction. Relay - switching is performed by moving parts of the <> circuit. Electronic, whether tubes or solid state, switching acts <> directly on the electrons (or holes), hence the term] Mechanical: man or motor powered, bars cams, wheels Electric: Relays, steppers, solonoids and contacts has logic tree. Electronic: uses active devices, tubes, transistors, ICs some types of diodes and neon filled tubes. Allison

28 years, 2 months

Inventory compaction

by COAKLEY＠AC.GRIN.EDU

> My mom got fed up by the amount of junk I have in my room, so I will > start to get rid of it (something I'd been planning to do). My girlfriend's getting fed up by the amount of junk I have in our apartment, so I'm trying to get rid of some of it, too. Shipping costs are all I'm looking for (trades accepted, too, though preferably for small things). 1. An Amdek color monitor, originally for use with Apples (I think). RCA video input, eighth-inch audio input. I've used this as a spare TV, but the screen has a strong green tint to it. It's heavy. 2. A Commodore 64, sold to me as not working, never bothered to test it. No power supply or anything. 3. A docking station for a Compaq laptop - 386/486, exact model unknown. -- Ben Coakley http://www.math.grin.edu/~coakley coakley(a)ac.grin.edu CMEL: Xavier CBEL: Xavier OH Spammers: How can you be sure that I don't live in Washington State?

28 years, 2 months

Need help with Mac Classic

by museum＠techniche.com

Hi Megan, If you're looking for a place to donate some computer (mac or otherwise), I'll take it. I'm trying to organize my personal collection in to a formal museum-like display. I'm always looking to expand that collection. At present it has 0 apple computer systems in it! I own my own software company and I am trying to do this in our warehouse area. I intend that it should remain a privately owned collection, but I'd like to open it up to public viewing, by appointment anyway. That way I could show it to groups like ham clubs, schools, software and hardware professional groups, etc. It's not a non-profit organization (in fact it's not legally any kind of formal organization, although my company informally subsidizes it), so there wouldn't be any tax write-off. Keep me in mind, Jon Healey techNiche, Inc. (603) 626-7000 >> My partner's classroom received a Mac Classic, donated by a parent. >> I've never done anything with Macs, so I need some help with this. >> >> - Can someone tell me the standard configuration(s) for a Mac Classic? >> >> - What options are available for it? >> >> - Where can I get a mouse (and other hardware) - Do I need a mouse? >> Can I get along without one? >> >> - Where can I get an operating system for it (MacOS?) >> >> Any and all help appreciated... >> >> Megan Gentry >> Former RT-11 Developer >> > >Get in touch with me and I'll be glad to help you out. >I can cut the OS on Mac disks for you. >I also have a couple of old Mac Plus systems that I've been looking >to donate somewhere. > >I can probably dig up a mouse as well. > >Bill >+---------------------------------------------------------------------------+ >| Bill/Carolyn Pechter | 17 Meredith Drive | Tinton Falls, New Jersey 07724 | >| 908-389-3592 | Save computing history, give an old geek old hardware. | >| pechter(a)shell.monmouth.com | >+---------------------------------------------------------------------------+ >

28 years, 2 months

8008 Datasheets

by allisonp＠world.std.com

<That sounds interesting. How much of that is just instruction set? If <that chapter is smallish, a copy would be great! I'm looking for info <sufficient to write a simulator, so ISA + exceptions/interrupts/etc. <should do the trick. The instruction set is some 48 instructions and most are real simple. to make a sim you need timing, instruction set functions and a few trivial details. one thing, write in something like interpreted pascal, the 8008 was slow as the fast part did a register to register move in a whopping 10.8 microseconds. To give an idea of how slow that is the 8080 did it in 2 us, z80/4mhz in 1us, 8048 2.5us, 8051/11mhz 1us, 8088/5mhz 1us. The 8008 was slow! Allison

28 years, 2 months

CP/M

by allisonp＠world.std.com

<"But 3.5" diskette drives are too difficult to modify. We've had good <read and write results by passing the index signal through a 1-shot <carefully adjusted to trigger slightly ahead of the actual index <position. But this is a very touchy arrangement, though it does work. < <I know that I have experienced the problem of the first paragraph on more <than the C10 disks. < - don Some formats produced with 1771 or 179x can be nasty. The fix is to delay the index using two oneshots one set long (95% or a rotation) and the second long enough to provide a recognizable pulse. This trick can permit you to "move" the index sensor as needed electronically. Allison

28 years, 2 months

Need help with Mac Classic

by mbg＠world.std.com

My partner's classroom received a Mac Classic, donated by a parent. I've never done anything with Macs, so I need some help with this. - Can someone tell me the standard configuration(s) for a Mac Classic? - What options are available for it? - Where can I get a mouse (and other hardware) - Do I need a mouse? Can I get along without one? - Where can I get an operating system for it (MacOS?) Any and all help appreciated... Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry(a)zk3.dec.com | | Unix Support Engineering Group | (home): mbg(a)world.std.com | | Digital Equipment Corporation | | | 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ | | Nashua, NH 03062 | "pdp-11 programmer - some assembler | | (603) 884 1055 | required." - mbg | +--------------------------------+-------------------------------------+

28 years, 2 months

Need help with Mac Classic

by jolminkh＠nsw.bigpond.net.au

I'm also playing with a Mac Classic at the moment. Mine had 2Mb RAM, a 20Mb hard drive and the keyboard and mouse. I believe they are very similar to the SE, just more economical to manufacture and with a 1.4Mb floppy drive. > >My partner's classroom received a Mac Classic, donated by a parent. >I've never done anything with Macs, so I need some help with this. > >- Can someone tell me the standard configuration(s) for a Mac Classic? Ram on the mainboard is 1Mb but there is an extender card usually fitted with another 1Mb and room for 2 X 30pin simms. I put 2 X 1Mb PC simms in it and they work fine. There is a jumper to move to do this. Well marked. 4Mb is max RAM. I replaced the hard drive with a 120Mb SCSI drive but the initialization program in the OS only works on Apple branded disks. I'm still trying to sort this out. > >- What options are available for it? > >- Where can I get a mouse (and other hardware) - Do I need a mouse? > Can I get along without one? You need a mouse. I have accumulated a few from garage sales etc. There are two types. You can't use the one from very early Macs, you need the one with a PS/2 size connector. Same as the keyboard, and in fact it plugs into the normal keyboard. > >- Where can I get an operating system for it (MacOS?) I also picked these up at garage sales. I have been told to stick with System 6 because System 7 takes up too much memory for this machine. Hans

28 years, 2 months

What is the first computer?

by Philip.Belben＠powertech.co.uk

HRK wrote: > A neat (english) description of the Z1 and Z3 could be found at > http://www.zib.de/prospekt/zuse/zusez1z3.html > (Hard code documentation) or > http://bang.lanl.gov/video/sunedu/computer/z1z4.html > (soft :) Thanks - I'll have a look at those! > The first programable general purpose computer is for shure > the Z1. And the first electronic computer is the Z3 since > the Z1 was just mechanical. Also both are the first binary > floating point computers (Babage used decimal wheels). Hey! They can't both be the first floating point binary machine! Presumably the Z1 was. And (though no doubt I'll find I'm wrong when I look at those web pages) I thought Z3 was a relay machine, not electronic. [Distinction. Relay - switching is performed by moving parts of the circuit. Electronic, whether tubes or solid state, switching acts directly on the electrons (or holes), hence the term] Was the Z3 like the Z4 in using old 35mm cine film for punched tape? (don't try and read it with an optical reader!!!!) > P.S.: The first calculatin machine might be the one of > Wilhelm Schickard from 1623. What date was Pascal's calculator, someone? Irony of the week: the Pascal calculator in the London Science Museum is a decimal model. That in the Deutches Museum is a Pounds, Shillings and Pence model. :-) Philip.

28 years, 2 months

Quarter classics (was: Big Iron Was:RE: Backwater are

by Philip.Belben＠powertech.co.uk

HRK wrote: >>>Speaking of big iron, if anyone runs across any arcade machines in my >>>general area, like within 300-400 miles, I WILL pickup. Looking for mostly >>>80's era games, like the old Atari vectors (Tempest, Asteroids, Battlezone, >>>etc.) but will take just about anything. > >> And if you know of a robotron in the SF bay area available for cheap, >> 4-6hours of sleep per night is way too much anyway... 8^) > > Robotron ? > > Talking about the East German Computers ? [falls on floor laughing] No. He is talking about video games. I made exactly that mistake about a year ago - someone mentioned that he liked Robotron, and I immediately jumped in asking for info about East German computers! (only to back out, somewhat embarrassed, a few messages later) I have, it seems, the front panel and associated logic from a Robotron [can't remember the model number]. I bought it on holiday in Munich, sorry, Muenchen, a few years ago (picture the scene: eccentric hacker with estate car (station wagon) full of kit, GB plates on the back, trying to get through customs at Strasbourg. I got so exasperated that when they asked, "etes-vous espion?" I said "mais oui!") But what I was really wanting to say was, at last someone else who's heard of the East German Robotron! Do you have any info about them, what they did, when they did it, specific machines? Is there the remotest chance that if I post the model number of my stuff you can find me docs on it? Or tell me where to find docs on it? Philip. <><><><><><><><><><><><><><> Philip Belben <><><><><><><><><><><><><><> Bloedem Volke unverstaendlich treiben wir des Lebens Spiel. Grade das, was unabwendlich fruchtet unserm Spott als Ziel. Magst es Kinder-Rache nennen an des Daseins tiefem Ernst; Wirst das Leben besser kennen, wenn du uns verstehen lernst. Poem by Christian Morgenstern - Message by Philip.Belben(a)powertech.co.uk

28 years, 2 months

Old Mac OS.... Help PLS!

by yaksaken＠hkstar.com

Hi Pamela Allison: > If you can't find one, check with Sun Remarketing in Smithfield Utah. They will sell all the way back to version 3.2 on 400 k disks. But the problem is that I live in Hong Kong.... :(

28 years, 2 months

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