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
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.
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)
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
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
--------------------------------------------------------
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!!!
>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
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
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.