Hi all,
does anyone have a hint how to configure a Philips P2701E serial text
terminal. I found zero Information in the net.... Are these some kind of
rebadged equipment?
Regards,
Wolfgang
Got a bit of a scare this week. I have most of my equipment stored and I received a call indicating
that the lock on one of my units was missing. The management put a "temporary" lock on the unit
until I could get down and survey what was going on (and put a new lock on it).
I went down this morning and there in front of the door to my unit was my lock that had been cut off
(I suspect with bolt cutters). Fortunately, there doesn't appear to be any mischief (other than having
to replace the lock). I suspect that someone was confused (and probably lost the key to their lock)
and opened my unit. When they saw what was in it they moved on. The reason that I suspect this
was that nothing was disturbed and there are several obvious items near the front that would've probably
gone missing if theft was the motivation.
I put a new high security lock in place of the old padlock and will probably replace my other padlocks
with high security locks to prevent this sort of thing in the future.
TTFN - Guy
Hi all,
Do you guys know of a failsafe way to check if a Teletype is for 110
or 220V? I've bought one which has a power connector which seems like
US mains. The motor is 50Hz, but I guess that won't make a difference.
Any quick way to check without completely dismantling the machine?
re,
Sander
--
~ UNIX is basically a simple operating system,
? ? ? ? ? ?but you have to be a genius to understand its simplicity. ~ dmr
cctalk-request at classiccmp.org wrote:
Message: 6
Date: Sat, 30 Jun 2012 01:47:24 -0300
From: "Alexandre Souza - Listas" <pu1bzz.listas at gmail.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Subject: Adapting linux for other ARM devices. Was:Raspberry Pi and
America,
Message-ID: <08b401cd567b$8e3cd550$6600a8c0 at tababook>
Content-Type: text/plain; format=flowed; charset="UTF-8";
reply-type=original
An interesting question that may fit on this list
There are lots of old ARM devices around. One that is very common in
Brazil is the "easybox" internet computer which is an ARM device with an ISA
slot (for originally a modem and optionally a NE2000 network board), some
peripherals, video output and remote keyboard. These can be had for (very)
cheap. How hard is to port e.g.: Angstrom or something like that for a
system like this?
Maybe I hadn't expressed myself well. I want to UNDERSTAND how the port
is done
Well, depending on the exact flavor of ARM CPU, it could be easy or
VERY, VERY hard.
The problem is that the ARM CPUs may all have essentially the same
instruction set,
but the on-chip peripheral configuration can be quite different. Also,
some chips had
significant bugs that needed workarounds. The ARM architecture spans a
wide range
of performance and capability.
The Beagle Board is an amazing system on a 75 mm square board, with USB,
HDMI
256 M RAM, SD memory card and runs on less than 2 W power. You can run a
full Linux Ubuntu system on it. I use them for net-attached devices
that export
TCP services or Glade GUIs to control little boards that stack with the
Beagle.
If you have an existing port for a related chip, or a board that uses
the same ARM chip,
it may not be that difficult. There will be a source code base and a
development
tools environment. You mostly customize the list of drivers to be
included, possibly
providing some parameters to select what peripherals are enabled and how
to route
them to the board.
If you are starting with a generic source tree and a chip that has not
has Linux ported
to it (or the port has not been updated in years) then it can be QUITE
messy.
I built an updated kernel for the Beagle board ON the beagle board, it
took about
a day to compile the kernel. That's why they use toolkits to do it on a PC.
Jon
Guys, Guys, Guys...
I am overwhelmed and slightly gobsmacked at the level of interest. I hope I won't disappoint you. Since the stuff is in machester and I am in Somerset (about 200 miles apart within England for those of you in the USofA), I won't know in detail what is involved until I get there at the beginning fo the week when I start clearing out. I do know there are a lot of electronic test equipment including scopes. IBM '60s manuals and hardware descriptions, mag tapes and paper tapes. Lots of valves/tubes also.
Please keep telling me your interests and I will conact relevant people nearer the time.
peter
|| | | | | | | | |
Peter Van Peborgh
62 St Mary's Rise
Writhlington Radstock
Somerset BA3 3PD
UK
01761 439 234
|| | | | | | | | |
There has been a lot of discussion on this subject and I have tried to read
all of it, but I may have missed a discussion of what I think is the key
problem in such a product. Apologies in advance if I am repeating something
As I recall you could not move a formatted ST506/412 HDD between controllers
without first reformatting. This is because the gap and header information
was likely different between different controller manufacturers. This
particularly applies to ECC but could include simple things like address
mark, sync byte, etc. So although your IDE drive gives you error free data
and a crystal will give you perfect serial timing (no pll required and the
pll in the controller never sees bit shift) the adaptor would have to
synthesize the particular format down to the bit and including the specific
ECC/CRC or the controller will post an error.
Since most of the ST506/412 controllers after the early ones were
"picocoded" state machines that did the serializing/deserialing I suspect
most any modern dsp can do the work, the real problem may turn out to be
getting the format information for the particular manufacturer and model
controller chip used in the system to which the adaptor attaches. Even
within manufacturers the format changed with generations and some
manufacturers did custom variants, some of which were rumored to be designed
to preclude generic ST506/412 drive attachment.
I suppose a very smart machine could learn by having a series of known data
patterns written to it, but that seems challenging.
So it may turn out to be an impossible task for other than the high volume
commercial controller chips and even there finding the specific ECC
algorithm might be difficult.
Just my 2 cents
Tom
Original Message:
Date: Sun, 24 Jun 2012 05:41:11 -0400
From: "Jeffrey Brace" <ark72axow at msn.com>
> Hello everyone,
> I was hoping for some definite direction in my endless quest to fix my
> C64.
Then I would suggest that, instead of just venting your frustration that
troubleshooting and repairing computers sometimes requires knowledge,
experience and tools and isn't always easy to do via email without access to
the machine, you accurately describe your symptoms in detail and ask for
specific advice on a list like this where folks know what they're talking
about; the Vintage Computer Forum is another good place, among others.
> I'm told to go to Ray Carlsen's site and that will have everything I need.
> http://personalpages.tds.net/~rcarlsen/cbm.html. Which is very nice, but
> I'm a beginner and I don't need just a bunch of schematics and reference
> material. I need step by step method which explains which tools,
> techniques etc. that I need to do.
What you need to do is look more closely in the right place:
http://cbm8bit.com/articles/raycarlsen/raysarticles.php
Near the bottom you will find a number of articles listing symptoms and
possible causes; yours is probably in there somewhere.
m
Hi all --
Picked up a (mostly) complete HP 9885M (8" floppy drive) set up for my
HP 9825 computer. I have the 9885M drive itself, a 98032A interface,
and the "Flexible Disk Drive" ROM pak for the 9825. I am unfortunately
missing the "9825A Disk System Cartridge" tape (hp p/n 09885-90035).
Any ideas if this has been archived anywhere? I haven't found it in my
searches. (Not that I currently have any means to get it onto my
9825...) Looks like this is actually required in order to format disks.
Sigh...
Unfortunately, the drive appears to be failing the built-in diagnostic;
there's a single LED that goes on when the test starts and it's supposed
to go out within a minute if the diagnostic's passed. The LED on mine
just stays on permanently. Unfortunately that's the -only- diagnostic
indicator on the unit. I've read through the service manual and unless
I'm missing something it doesn't really describe how to go about
narrowing down the problem. There's a flowchart that basically says "if
the light doesn't go out, it's a problem with the controller in the
drive unit" which seems fairly obvious...
The service manual mentions a diagnostic on the tape, but I don't have
this to aid me. Anyone have any experience with these drives? Any
pointers for starting out? (I've checked the obvious things -- the
power supply voltages look good, etc).
Thanks as always,
Josh
On 29 Jun 2012, at 12:16, George Rachor <george at rachors.com> wrote:
> Hmmmm,,
>
> I had pulled the battery for only a few minutes?..
> I'm leaving the power unplugged and the battery out overnight?
Advisable. The minimum I ever had it work over was about 3 hours. I
usually left them overnight to stand in a corner and think about what
they'd done.
--
Mark Benson
http://markbenson.org/bloghttp://twitter.com/MDBenson
