In a message dated 12/31/98 9:42:11 PM EST, adavie(a)mad.scientist.com writes:
<< I wonder if there are other examples of
ins/outs that you oldies remember and would care to share. Things that were
ubiquitous and no longer with us. >>
how about BBSs? they are still around, but with the net catching on and
everyone getting on it, bulletin boards are all but forgotten it seems.
> On Thursday, December 31, 1998 7:49 PM, Andrew Davie wrote:
> A gent I've just traded with to obtain a boxed SYM-1 casually
What version of SYM is it? I have a SYM that is a slightly later one,
1.1? It's not the one that took a 680x chip (version 2?), but the one
after the VIM. I'm looking for a manual, or at least a photocopy of the
schematics. Someone from Australia sent me an old SYM manual set, but it
was for the earlier VIM.
He also sent along the BASIC and RAE (assembler) proms. I'm keeping the
BASIC, but would be willing to trade the RAE for a SYM manual.
Al McCann
amc358(a)interserv.com
Hello.
I have a WANG WLTC computer that I would like to either sell for a
reasonable price, or trade for another laptop/portable computer (preferably
classic).
Here are the specs:
-8086 (8MHz?)
-10MB internal HD
-WANG compatible LCD (can emulate CGA or Hercules)
-Built-in thermal printer w/plain-paper capability (ribbon available)
-512K RAM
-50-pin Centronics SCSI port for floppy drive, external HD, etc.
This computer supposedly has an in-ROM wordprocessor and spreadsheet, but I
have yet to figure out how to get into them.
I have a not-so-good battery for it, so it will occasionally not boot (sort
of like the Mac Portable - must have a charged battery to run correctly).
The internal P/S has a small problem in that it will occasionally blow a
cap. I think this is either caused by the bad battery or because some of
the other electrolytics are starting to go bad (I have no way of testing
them).
It requires an 18vDC, 1.5 amp external P/S, which I don't have.
The person that I previously had a deal with seems to have backed out again,
so I'm offering it to the first person that responds with a reasonable
offer.
I have two WLTC's , and I don't like to have more than one of a single type
of computer, so I'm offering it here, where someone would would possibly be
able to fix/use it. I'd say that it's a fairly durable computer, since my
other one has nearly (a guess) 27,000 hours on the HD, with no bad sectors,
it still ran fine, even after it was dropped, until the external P/S got
zapped last year. Now I run it off of three 6v Power Wheels batteries.
If anyone is interested, or wants a picture of it, send me a personal email,
and I can send you one (about 40k).
--
-Jason Willgruber
(roblwill(a)usaor.net)
ICQ#: 1730318
<http://members.tripod.com/general_1>
PS>> If anyone has any spare WLTC power bricks, and you want to sell one,
let me know. -ThAnX!
<The "glass capacitors" that look like diodes look that way because they =
<ARE diodes. It turns out that one of the cheapest and best ways to make =
<0.1uF capacitors is to make two diodes in the same case, in series with =
This is inaccurate. The size of the junction needed to create a .1uF cap
would be huge. It would not be cheap nor effective. The cap inside is
similar in construction to those now seen on SMT loaded cards.
It is possible to make caps using the junction and there are devices
that use this principle. However the capacitance is A) variable with
voltage imposed across the reverse biased junction and B) 300-500pf is
about the upper limit for them. They are known as varactor or varicap
diodes and are not found on SA8XX drives.
The glass caps were generally just a different package with one advantage
in that glass is hermetic. Or better said compared to plastics and some
ceramics they are impervious to moisture.
Allison
The "glass capacitors" that look like diodes look that way because they ARE diodes. It turns out that one of the cheapest and best ways to make 0.1uF capacitors is to make two diodes in the same case, in series with opposite polarities (it never conducts because one of the diodes is always back biased). The back-biased junction forms the capacitor, and it has very good characteristics for bypass (decoupling).
As for the 104 notation, this is 10**4 (ten to the 4th power). Thats 10,000 pF = 0.1 uF. 50V is the voltage rating.
Barry Watzman
On Jan 1, 0:08, Tony Duell wrote:
> Yes.. 104 -> 10*10^4 pf (read the numbers like the bands on a resistor,
> but in pf) = 0.1uF. The Z is the tolerance, I think. 50V is the maximum
> working voltage.
Yes, the letter is the tolerance, as defined in IEC 63(1963) (and possibly
elsewhere). J=5% K=10% M=20% and Z means "something else" or "not very
good" or "unclassified", often +20% -80%.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
Mr "TV Dog" is back up and around with his MSDOS/Tandy 1000 realm and
has posted a page of general purpose software for internet use on older
non-windows machines at http://www.agate.net/~tvdog/internet.html
Just in case you wanted to know <g>
<The AIM-65 (single-board, full keyboard, LED display and 20-column
<printer on-board), SD Systems Z-80 starter kit, Motorola MEK6800, VIM-1
<(predecessor to the SYM-1).
What about the Intel SDK80, SDK85, SDK88, NEC TK80, the AMI EVKseries and
the IMSAI IMP48?
Allison
<I am fortunate to have recentlyly added a SYM-1 to my collection.
<Could anybody with instructions/documentation for this machine please
<contact me. I'd like to explore the possibility of purchase or trade of
<these documents, or copies. I now have the KIM and SYM - would anybody car
<to suggest another target to aim for? ie: What other single board computer
AS a collector you should study records of the time (magazines and the like)
for your targets. IT would give you a better idea of the significance and
the relationships of thse items.
FYI: AIM-65 would be one to looks for.
Allison
On Dec 31, 20:01, Sam Ismail wrote:
> AppleSoft didn't have a PRINT @ statement so chalk that one up to my
> arrogant ignorance. Interestingly though, Woz squeezed the '@' symbol
> on to the original Apple ][ keyboard above the P key (shift-P = @). Who
> knows why. The @ wasn't used for anything inherent in the Apple.
It follows teletype usage, I think; CTRL-SHIFT-@ = CTRL-@ = NUL Probably
Woz had a use for 'NUL' rather than '@'.
w.r.t. "PRINT @", several BASICs (but not Applesoft) had "PRINT AT"
instead.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
