The Turtle Tot is a two-wheeled robot, that is about a foot in diameter. It
communicates with a computer via RS-232. The supporting software was made
by Harvard Associates. I think the actual robot was made by Flexible Solutions,
a Tasmanian company.
The one I have is missing several chips, and I am trying to find out what they
are. If anyone has documentation on this device that includes the board
layouts, I could use some help.
Thanks,
-- John Tinker
>> CESIL (Computer Education in Schools Instructional Language),
>Ha ha, I'd forgotten about that one... I remember typing in a CESIL
>interpreter into the Speccy from some magazine or other. It
>was even slower than ZX BASIC though so I gave up on it after a couple of
weeks..
I wrote that "interpreter". It was published in ZX Computing I think. I
still have the magazine upstairs. The original program was written for my
'O'-level in Computer Studies. The magazine had already published Moon
Rescue (a rip-off of Lunar Lander) that I wrote one weekend after Swap Shop
had been cut short for some sporting event. Smelling the lure of money (15
quid was a lot for a 15-year old in 1981!), I thought I'd send of the
ZX-CESIL after converting it from my ZX-81 to my Spectrum.
I remember using the real ICL-CES CESIL at school - writing out the code on
sheets of paper, sending them off to the local poly. We had a TTY link
with an old-fashioned modem and a paper tape reader to boot. We were very
jealous of one of the other schools that had a VDU monitor!
Ah, yes. Those were the days. My friends and I used to talk about how
great it would be to have a VDU with such hi-res graphics that you could do
1024 x 1024 in full 24-bit RGB. We calculated the cost of the RAM to hold
one frame and it came to hundreds of thousands of pounds. Not in our life
time, we thought. Hee-hee.
BTW, I've seen my ZX-CESIL2 on a Russian Spectrum software repository site
that you can download and run via a Z80 emulator. Pointless but
fascinating!
John.
As late as 1977 ! was using two Burroughs E6000 computers to perform the
function of loan payment application. The loans were for health club
membership in the Chicago area and a great deal of the rest of the upper
midwest area. We had over 50,000 loans outstanding at any time and
processed from 1,000 to 3,000 loan payments a day. The machines we had were
magnetic stripe ledger card readers and they would punch an output card
with the results of the processing of the transaction. The latest
information about the loan kept on a master deck of cards was replaced with
the card that was punched as a result of the transaction on the E6000. The
update was performed on a daily basis using the 085 sorter and a
reproducer/collater. During the last 8 to 12 months of the use of the
E6000, while a conversion was being worked on, we used only one E6000 and
kept the other one for spare parts. Burroughs had run out of spare parts.
The system worked, but it was manually work intensive, fraught with errors
and created a great deal of work at the end of the month to balance the
ledgers.
>>>Are the 5110's of any collector value (not that I would ever part with
>>>mine, but I am curious if it is just me that wants to keep it, or if it
>>>
>>
>> The ones with APL seem to be harder to find than the ones with
>> BASIC :(
>>
>> (I'm looking for a working APL model of 5100, 5110, or 5120 ...
>> can trade BASIC model of 5110 or 5120)
>
>
>Ours is an APL model - sorry not available.
>
>Surely the dual APL/Basic are even rarer?
Know what... mine might be a dual! I remember using Basic on it, and
there is a front switch to go between basic and something else. I would
have said mine was basic only, but just friday, while cleaning out some
old stuff, I came across the APL manuals for the 5110... so that would
sure tell me mine is a dual (I only have the one, so the APL stuff didn't
go it a different machine).
And nope, mine isn't available either.... except maybe in trade for a new
pickup truck... I am in desperate need for one of those.
-chris
<http://www.mythtech.net>
On Oct 13, 13:10, Eric J. Korpela wrote:
> > 100baseTX uses the same pairs as 10baseT.
> >
> I thought that 100bTX uses 3 pairs for full duplex (at least my
> wiring instructions say it uses 1+2 3+6 and 4+5.) Have I gotten some
> misinformation?
Yes, I'm afraid you have! 100baseTX uses the same pairs as 10baseT, no
more, no less. 4+5 are definitely not used. However, they are used
(along with 7+8) for 100baseT4, which uses a different encoding and
modulation scheme to permit 100Mb/s operation over lower-grade cable, using
all 4 pairs, and similarly 1000baseTX uses all four pairs. Nothing I know
of (certainly no standard Ethernet technique) uses three pairs.
In 100baseTX full-duplex (and 10baseT full-duplex which is an extension of
the older standard, not always supported) the same pairs are used for
transmit and receive as in half-duplex. The only difference is that both
pairs are allowed to be active at the same time (which would be counted as
a collision otherwise).
--
Pete Peter Turnbull
Network Manager
University of York
Hi, Eric Smith, currently stuck in Colorado with a large truck full of
classic stuff has asked me to post this. (He doesn't have net access.)
He appreciates the outpourings of concern, and wishes to communicate that
all appears to be under control now.
The springs are being repaired on the truck and he should be able to finish
the journey.
Thanks everybody for your concern.
-Mike (for Eric)
Chris,
Thanks for the suggestion...But already looked at that, the keyboard is the
old two metal contacts (2mm apart) on the board and a conductive surface
under the key type.... No sign of spillage or delay in key returning to
normal...
I suspect a component fault, but have no idea where to look without a
manual...
Desperately seeking any 480z or 380z manuals or other information, online,
original or photocopy.
Rgds
Simon
-----Original Message-----
From: Chris [mailto:mythtech@Mac.com]
Sent: 11 October 2001 16:03
To: Classic Computer
Subject: RE: Research Machines Information
>the keyboard repeats (a bit like local
>echo). If I press a key, I get two of the same character on the screen. One
>appears when the key is pressed, and the other when it is released.
I have seen this happen MANY MANY times with PC keyboards, so maybe my
findings apply. In every instance that I have found it, it is beacuse
someone spilled either soda or coffee into the keyboard, and the pads
were sticking. The key would register when pressed, and then when
released, the pad wouldn't pop up right away, instead it would "peel" up,
and cause a 2nd (or sometimes a 3rd if it was sticky enough) registration.
Opening the keyboard and washing with alcohol or contact cleaner has
always fixed it for me.
-chris
<http://www.mythtech.net>
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Welp, have managed to reach the fellow who wrote the conversion utilities for
these fine calculators.. And got a very nice pointer to pretty much all I would
ever want to know about them. Now I get to start on a Linux kernel driver to
make them appear as serial devices.. A couple hundred baud fake serial
connect over /dev/dsp is looking mighty feasable..
I *WILL* IRC from one of these, goddamnit..
Jim
> > Who cares what the cause is? The point is that it won't work.
>
> This comment worries me a lot (mind you, it's typical of the mentality of
> PC-goons, but I thought this list was mostly hackers)...
>
> Whenever something doesn't work, my first reaction is to fix it. And the
> first stage in fixing a problem is to identify what that problem is (at
> whatever level of detail is necessary to be able to decide on the right
> repair).
>
> -tony
I'm with you, Tony. From what Iggy wrote it appeared that he stuck a bunch
of boards in a system,
didn't get the results he expected, and just gave up.
I simply do not understand this sort of thinking. Aren't we supposed to be
the ones in control of the machines???
Glen
0/0
> There is WYSE emulation
>software available, but at a cost.
Do you know a product name? where can I get info? I can find a free wyse
50 emulator (well, sort of, there is one in an old version of ProComm+
that I have), but it doesn't seem to work with the system.
Otherwise, is there someplace I can look up the spec for the protocol it
uses... maybe write my own emulator. Is this public info, or would I have
to buy the rights from Wyse?
-chris
<http://www.mythtech.net>
