test-drb December 2002

test-drb@ccmp.vtda.org

250 participants
519 discussions

by pete＠dunnington.u-net.com

On Dec 17, 16:00, Dwight K. Elvey wrote: > Here is one that is even a little different still. > It is what is called Manchester encoding, using biphase > clocking. You don't indicate 1 or 0, you indicate a change > by a quick clock and no change by a long clock. > This is the type of encoding used on my Poly88 for > what they call PolyPhase. This runs at 2400 baud. The Exidy Sorcerer also uses Manchester encoding. For 1200 baud this equates to 1 cycle of 1200 Hz for a logic 1, and a half cycle of 600 Hz for a logic zero. For 300 baud it becomes 8 cycles of 2400 Hz and 4 cycles of 1200 Hz. It sounds like plain FSK, but if you draw the waveform for "101100" at 1200, you'll see it's actually a Manchester code: __ _____ __ __ _____ | |__| |__| |__| |_____| | --1-- --0-- --1-- --1-- --0-- --0-- > There is a standard called Byte format that uses 300 baud > and the two tones 1200 and 2400. Byte format is Kansas City format. It was proposed in Byte and formalised at the KC meeting. I think the Commodore PET uses modified CUTS. It records each block twice, which is why it's relatively slow, but also pretty robust. -- Pete Peter Turnbull Network Manager University of York

23 years, 1 month

Looking for HP 10342B Bus Preprocessor software

by charles＠socketcom.com

I am trying to find the software that is needed for an HP 16500A logic analyzer to operate the HP 10342B Bus Preprocessor. The HP16500A I am using has an 16510A analyzer module. I just need the analyzer setup files and inverse assembler. Thanks, Charles Ader.

23 years, 1 month

Test message

by kyrrin＠bluefeathertech.com

Pardon the test. Merry Christmas. ;-) -=-=-=-=-=-=-=-=-=-=-=-=-=-=- Bruce Lane, Owner & Head Hardware Heavy, Blue Feather Technologies -- http://www.bluefeathertech.com ARS KC7GR (Formerly WD6EOS) since 12-77 -- kyrrin(a)bluefeathertech.com "I'll get a life when someone demonstrates that it would be superior to what I have now..." (Taki Kogoma, aka Gym Z. Quirk)

23 years, 1 month

Happy Holidays

by mhscc＠canada.com

Merry Christmas, Happy Holidays, Happy New Year, Fruitful Collecting, whatever good wishes mean the most to you! It's been fun and interesting to be a part of this group for the last year and a half or so; thanks! mike

23 years, 1 month

Digital SCSI Controller ???

by sipke＠wxs.nl

I was donated a very long (full PC-XT length) PCI card with: -An Intel I960 CPU. -A Symbios Login 53C720 -Chip -A LSI LIA9616 21-40677-02 DC74468 NNM9642 WE1557 -Chip -And Various SMD ram and Rom chips Boardnumbers I found: -5022943-01-H01-P02 (SMS2) -5422944-K Adapter Is there anybody out there who's got a clue ? Sipke de Wal -------------------------------------------------------- http://xgistor.ath.cx --------------------------------------------------------

23 years, 1 month

Microwave Experiments

by marvin＠rain.org

I know this is OT, but I think most people on the list would enjoy this kind of stuff. There is also a link to a Plasmoid experiment and other interesting stuff! http://www.amasci.com/weird/microexp.html Merry Christmas to everyone!!!

23 years, 1 month

RS232 or Parallel port based keyboards and joysticks

by ram_suganthi＠hotmail.com

I found the following website that basically does what I need using a SUN Keyboard: http://atrey.karlin.mff.cuni.cz/~vojtech/input/adapters.html As for joysticks, is the gameport joysticks a version of an RS232? Is it possible to convert gameport to RS232 signals? Thanks for the responses... Ram _________________________________________________________________ Protect your PC - get McAfee.com VirusScan Online http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963

23 years, 1 month

VT50 connection

by Antonio.Carlini＠riverstonenet.com

>I am trying to find the 20mA connection diagram for a VT50 terminal. The VT50 is very similar to >the VT52, but has a terminal strip on the underside of the terminal where the 20mA connection is >made. I do not know which terminal is which. If anyone has a schematic of the VT50, I would very >much like a copy. A scan of the VT50/VT52 Pocket Service guide lives at http://www.vt100.net. There's a whole bunch of other VT5x stuff there too. I don't recall whether actual schematics are to be found there or not. Antonio

23 years, 1 month

Otrona Attache

by ssmith12＠rochester.rr.com

Hi J.C., I have a functioning Attache (it has some video probs; like vertical roll) which I've owned since new. Should I fix it or sell it? If so, how (either/both). And who is this Donald that has all Otrona's inventory? If you don't mind my asking.... --Steve Smith

23 years, 1 month

looking for Xerox Alto

by p_reale＠minotaurz.com

I am looking for any version of rthe Xerox PARC Alto for my museum. I am located in Southern Calif. IO might also have something equally valuable to trade (like a Silicon Graphics 2400 Turbo) in a mini.

23 years, 1 month

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test-drb December 2002