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101090 discussions

Ressurecting FDDs (was Original IBM PC (was Re: Prices to p

by SUPRDAVE＠aol.com

In a message dated 98-06-02 15:57:21 EDT, you write: << > And while we're on the subject, has anyone figured out how to use a > standard PC/Teac fdd with a mac? >> I dont think it would be possible since the mac varies the drive speed to put more information on the disk. if it were possible, it would be a nonstandard format. david

28 years, 2 months

What is it called when the 60hz line power becomes something else?

by crf＠stoneweb.com

On Mon, 01 Jun 1998 14:49:39 rigdonj(a)intellistar.net remarked: > Oddly enough a lot of the HP stuff is spec'd to run on 50 to > 440 Hz. I'm not sure why unless it's to allow it to also be used > in aircraft but that doesn't seem likely. Shipboard applications are frequently run at 440 Hz as well as aircraft; it's quite common in military environments as it keeps the transformers small. Actually, I believe it's 400 Hz, not 440, but whats a few ticks between friends? On a similar note, ferroresonant transformers can do some very bizarre things when offered a mains frequency they weren't designed for. DG's Eclipse S/230 uses a single resonant transformer, rectifiers, and filter caps for its power supply and little else. The specifications call for a mains frequency deviation of under 1/2 Hz in either direction. However, if the frequency is good, the regulation that the supply gives is quite remarkable. ______________________________________________________________________ | | | | Carl Richard Friend (UNIX Sysadmin) | West Boylston | | Minicomputer Collector / Enthusiast | Massachusetts, USA | | mailto:carl.friend@stoneweb.com | | | http://www.ultranet.com/~engelbrt/carl/museum/ | ICBM: N42:21 W71:46 | |________________________________________________|_____________________|

28 years, 2 months

Remembering BYTE acticles

by dcoward＠pressstart.com

>> I took out from the library a sort of collection: 20 years of byte >> with some historic articles, ads ,etc. from BYTE's point of view in >> 1994. I liked the timeline, but the articles are very boring and >> technical. >Hey - I think you'll find that most of us liked the "boring and >technical" articles better than the drivel they've been >publishing since the mid-80's ! I build one of those projects from BYTE in about 1984. A project for the Commodore 64. It was just two precision resistor networks connected through CMOS drivers to the address lines of the C64. One network for the lower 8 address lines and one for the upper 8. When the two networks were connected to the XY inputs of a oscilloscope, you had a 256 by 256 pixel display of where in memory the 6510 was executing. I was making my living breaking the protection on disk software at the time and this cartridge came in real handy for determining where code was being loaded into memory. I also started writing a TIC-TAC-TOE game for use with the cartridge. The program would place JMP instructions in different parts of memory to draw the TIC-TAC-TOE squares, Xs,and Os on the oscilloscope. Sort of a vector graphic version. I had alot more time on my hands back then. ========================================= Doug Coward dcoward(a)pressstart.com Senior Software Engineer Press Start Inc. Sunnyvale,CA Curator Museum of Personal Computing Machinery http://www.best.com/~dcoward/museum =========================================

28 years, 2 months

Casio Catalogs FS

by rigdonj＠intellistar.net

I have five Casio calculator catalogs for sale or trade for ?. All are color catalogs and are in excellent condition. 1985, 1987, 1988, 1990 & 1991. E-mail me privately with any questions or offers. Joe

28 years, 2 months

Commodore stuff for sale

by rigdonj＠intellistar.net

I have the following Commodore stuff for sale for the best offer. E-mail me privately with your questions and offers. Joe Commodore Vic 20 Commodore Sargon II chess game cartridge with manual Commodore Gorf game cartridge C2N cassette deck 2 Commie joysticks Commie 1520 printer V 20 power supply V 20 TV modulator Slik Stik joystick by Suncom (for V20?) Volks Modem 6420 (for V20?) Vic modem 1600

28 years, 2 months

Ressurecting FDDs (was Original IBM PC (was Re: Prices to pa

by sinasohn＠ricochet.net

At 03:12 PM 5/28/98 +0000, you wrote: > On a related note, I have 3 Atari STs all with failed fdds. Any tips on >re-alligning these with-out the rather expensive reallign equipment ? Quite a If they're the later models with the rectangular eject button in the normal place (rather than earlier models with the parallelogram? (/___/) button) you can just replace them with any old 720K drive. Other than that, you can use external drives; there should be (somewhere on the web) a diagram for making the FDD-to-ST cable. Connectors are available. (Or you can buy a cable from BEST Elect. in San Jose(?) or elsewhere.) And while we're on the subject, has anyone figured out how to use a standard PC/Teac fdd with a mac? --------------------------------------------------------------------- O- Uncle Roger "There is pleasure pure in being mad roger(a)sinasohn.com that none but madmen know." Roger Louis Sinasohn & Associates San Francisco, California http://www.sinasohn.com/

28 years, 2 months

Insanely Great

by sinasohn＠ricochet.net

At 06:46 PM 5/29/98 -0700, you wrote: >> 2)It mentioned a "new input device" that was before the Xerox machine, >> to be used alongside the mouse, was flexible but required training. >> What was it? > >That probably referred to the "chord" keyboard. It allowed you to type >with one hand. I remember a PC keyboard replacement that was a one-handed keyboard; it used combinations of buttons to replace all the individual letter keys. I remember thinking it was a good idea, and could be used perhaps (or expanded) for other languages like chinese. Anyway, I seem to remember that it was supposed to be easy to learn. Was it? was it the "Chord" keyboard Sam mentioned, or were there others? Are they still available? Is there any advantage? I'm thinking that it would be a good option for situations where a) space is at a premium (laptops) or b) one's hands are engaged elsewhere. (No, I wasn't thinking of *that*! (I'm not that much of a nerd!) I was thinking of vehicle/equipment control sorts of things.) --------------------------------------------------------------------- O- Uncle Roger "There is pleasure pure in being mad roger(a)sinasohn.com that none but madmen know." Roger Louis Sinasohn & Associates San Francisco, California http://www.sinasohn.com/

28 years, 2 months

Processing data in blocks

by sinasohn＠ricochet.net

At 07:55 PM 5/28/98 -0700, you wrote: >The terminal acts as a buffer for the data, not for the keyboard. The >keyboard is used to make changes to the data in the buffer and >initiate the transfer of the changed data back to the 3000. The >keystrokes themselves don't get sent to the 3000, only the edited >data. It's not a dead concept, either. Wanna see it in use? Go to <http://www.sinasohn.com/clascomp/specform.htm>. The form (aka web page) is downloaded to your terminal (aka browser), you enter your data, make changes/edits, and then transfer the data (aka submit) to the host system (aka web server). Same thing, only with prettier graphics and much slower. --------------------------------------------------------------------- O- Uncle Roger "There is pleasure pure in being mad roger(a)sinasohn.com that none but madmen know." Roger Louis Sinasohn & Associates San Francisco, California http://www.sinasohn.com/

28 years, 2 months

RSX-11M Primer?

by healyzh＠ix.netcom.com

Well, I'm in, I'm excited :^) , and I'm clueless :^( Is there any kind of RSX-11M primer online anywhere? So far I've figured out "TIME" and "DIR" :^) What I'd really like to do is transfer the system from the RL-02 pack to the /73's internal Hard Drive. I'd really like to slim the /73 down, and the RL02 is more than twice as big as the /73 :^) Zane | Zane H. Healy | UNIX Systems Adminstrator | | healyzh(a)ix.netcom.com (primary) | Linux Enthusiast | | healyzh(a)holonet.net (alternate) | Classic Computer Collector | +----------------------------------+----------------------------+ | For Empire of the Petal Throne and Traveller Role Playing, | | see http://www.dragonfire.net/~healyzh/ | | For the collecting of Classic Computers with info on them. | | see http://www.dragonfire.net/~healyzh/museum.html |

28 years, 2 months

PDP-11/73 Boots!!!!

by healyzh＠ix.netcom.com

YAHOO!!!! Thanks to the bootstrap that Tim posted I just booted one of my SMS-1000's off of a RL-02. Turns out it's running "RSX-11M 4.2 BL38B", on the down side I've no idea what the login/password are :^( BTW neither SMS-1000 that I've got has boot ROM's that support a RL02. Not surprising since their S/N's seem to be sequencial :^) Zane | Zane H. Healy | UNIX Systems Adminstrator | | healyzh(a)ix.netcom.com (primary) | Linux Enthusiast | | healyzh(a)holonet.net (alternate) | Classic Computer Collector | +----------------------------------+----------------------------+ | For Empire of the Petal Throne and Traveller Role Playing, | | see http://www.dragonfire.net/~healyzh/ | | For the collecting of Classic Computers with info on them. | | see http://www.dragonfire.net/~healyzh/museum.html |

28 years, 2 months

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