Hi
I vaguely remember a rumour about a cheap kit terminal to go with the
Heathkit LSI-11.
The boards are that paper based stuff you see in consumer electronics.
Rod Smallwood
-----Original Message-----
From: cctech-bounces at classiccmp.org
[mailto:cctech-bounces at classiccmp.org] On Behalf Of Ashley Carder
Sent: 14 June 2007 20:11
To: General Discussion: On-Topic and Off-Topic Posts; General
Discussion: On-Topic and Off-Topic Posts
Subject: Re: Strange VT50 Decscope
>From: Vincent Slyngstad
>
>A friend of mine who is a former DEC employee once told me a war story
>about being given a "prototype" terminal to take home. He said the
>PCBs were thin, and kind of flexible, like the cardboard sheets in the
>back of a tablet of paper, and the thing was very tempermental -- even
>after you got it working again the MTBF was in hours. He said he
>eventually threw the accursed thing away.
>
>I wonder if this is one of those?
>
> Vince
It definitely sounds like one of these, except that the guy said he used
this one for about 6 years. I have posted more pictures of this odd
terminal. The board in the back is warped and kinda flimsy looking.
Check out the pictures:
http://www.woffordwitch.com/ProtoVT50.asp
Ashley
http://www.woffordwitch.com
http://cgi.ebay.com/Digital-Equipment-Corporation-Rainbow
-PC-1982_W0QQitemZ110138804739QQihZ001QQcategoryZ1247
QQrdZ1QQcmdZViewItem
Aussies must have something against keyboards. The
Tandy 2000 that appeared recently didn't have one
either! Apparently this dude is a collector too (look
in the background of the 2nd picture).
____________________________________________________________________________________Ready for the edge of your seat?
Check out tonight's top picks on Yahoo! TV.
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>
>Subject: Re: Pictures of My Machine Room (So Far)
> From: woodelf <bfranchuk at jetnet.ab.ca>
> Date: Sat, 16 Jun 2007 11:36:25 -0600
> To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
>
>Alexandre Souza wrote:
>
>> Interesting how things are made in USA (?). Here everything is done
>> with brick and cement, you don't need usually to do what you did. I
>> still wonder why americans (and other people) build houses all of wood :oO
>
>At one time wood was cheap. So was brick a very long time ago.
>
>> Greetz from Brazil
>> Alexandre Souza
In many parts of the USA insulation is required as it's either very cold in
the winter or very hot in the summer. In some areas that seasonal change
can be exteme. Either way insulation can be easier to do with wood than
brick or stone.
FYI: I never store anything fragile in my shed out back as hotter than
54C in the summer and colder than -10C in the winter are all too common.
Those extremes are not good for electronics.
Allison
Any idea what a Telram T-3000 might be worth? Ran across a guy that
had 4 or 5 with original boxes, looking for me to make an offer. I
think he was looking for $200 or so each, which seemed a bit high to
me, but I really have no clue, and I didn't want to miss out if they
really are worth that kind of $$.
Not sure how old your post was that I googled, but you might have a
better idea than I.
Thank you!
Andrew.
> I guess in other words, if you had a 68000 processor with some
> attached RAM and a random UART (6551 or Z8530 or 8250/16450/16550),
> what else might you need to bring up CP/M-68K?
A mass storage device with CP/M bits on it with the right BIOS.
Since there are disc images and a boot prom for the Sage, I thought
it would be the easiest way to go. The alternative would be to bootstrap
it through cross-development tools, since all the sources are available.
At 03:07 PM 6/15/2007, Jason T wrote:
>On 6/15/07, Rick Murphy <rick at rickmurphy.net> wrote:
>
>>A process known to work (I used this to copy the VMS Hobbyist CD:
>>
>>dd if=/dev/cdrom of=vmscd.iso bs=32768
>>cdrecord vmscd.iso
>
>This thread has been educational - I had assumed that VMS and other OS
>discs were essentially "uncopyable" under PC software. So will the
>above process(es) also work with IRIX, NeXT, MacOSX and other format
>discs (sorry I don't know the proper names of those formats?)
The low-level format of a CD is defined by a standard that everyone
follows. That means that you can use simple low-level tools to copy
>from a CD (and copy back on to a blank CD-R). You can do the same thing
with SCSI disks for the same reason: it's just a bunch of bits with a
standard hardware interface; it doesn't matter what format the OS uses.
Using dd to copy from one disk to another works a treat when you're
using SCSI devices (modulo bad blocks, etc.)
For SCSI disk copying, it's best if the source and destination are the
same size. For a CD, that's taken care of.
-Rick
William Maddox wrote:
Some years ago, an old decomissioned Cobalt-60
radiation therapy machine that had been sold to a
Mexican hospital ended up in a lot of scrap metal.
The problem was detected when a truckload of "hot"
steel rebar set off the radiation detectors when
coming *into* one of the weapons labs. It turned out
some of the metal had ended up in the cast-iron stands
for restaurant tables (McDonald's, I think). I wonder
how much of this radiactive metal was never located...
--Bill
-------------------------------------------
There was an old Nova special about a very similar case except that a lot
children were playing with bits and pieces from the machine in the scrap
yard. Several came down with radiation poisoning and/or leukemia. By time
it was discovered there were dozens of people exposed to it. If I remember
correctly, though it was Cesium 137 packaged in nice bright coloured
packages, very attractive to children. Most of the material was never
recovered.
Billy
Someone on comp.os.cpm wanted to fiddle with the Alcyon C compiler
and asked if there is a simulation of CP/M-68K running under Unix.
After a bit of digging, I couldn't find one, which was surprising.
Does one exist? There are a few simulated 68K systems in MESS, but
none of them ran CP/M. It looks like a SAGE II simulation could be added
since the software and docs appear to be out there (doesn't look like
the SAGE IV boot prom has been dumped)
> 1820-2075 = 74LS245 (that has 20 pins, surely)
> 1826-0210 = LM361
> 1820-1197 = 74LS00
> 1820-1216 = 74LS138
> 1820-1202 = 74LS10
> 1820-1112 = 74LS74
> 1820-1422 = 74LS122
> 1820-2058 = MC3448L (HPIB buffer chip)
> 1820-0325.= MC815P
Wow!!!! Thank you!!
This really simplify the task to understand what's wrong and replace a chip
if needed.
I'm just curious about two things:
first, are this hp house codes generic (i.e. valid for any product), or are
they related to this controller only?
second, where do you find these valuable informations?!?!? ;-))
>> I've checked almost all points in the circuit, and I didn't find any -Ve
>> supply. Also, PSU only gives +5 and +12 volt.
>Yes, but if the -ve supply circuit has failed, you won't find it :-)
Oh, yes, that's true... ;-)
>I am pretty sure I have one of these, or something closely related. If
>you get stuck, I can be convinced to find it, pull the covers and do some
>tests.
Ok, I'll let you know.
In the meantime, maybe I've found a complete service manual for the drive.
I'm waiting for it.
Thank you.
Roberto
At 07:12 PM 6/14/2007, Rod Smallwood wrote:
>So back to the original question:
>
> If I want to build a Linux system I go to a distribution site (one of
>many), download an .iso image, burn it into a standard 600Mb CD, boot
>the CD and create a system. No funny block sizes, no odd file extensions
>and no special SCSI drives. So what can I not do this for VMS without
>the pantomime? A step by step known to work checklist would be a start.
A process known to work (I used this to copy the VMS Hobbyist CD:
dd if=/dev/cdrom of=vmscd.iso bs=32768
cdrecord vmscd.iso
VMS CDs use 2048 byte sectors, just like everything else so there's
nothing to worry about there.
You don't need to use a magic "512 byte" capable drive to burn the
disk, but you do need a drive that will remap if you're going to boot it.
You apparently already have the image, so get cdrecord, available for
Unix and Windows.
I do find myself wondering how you created the disk image in the first
place, and if it's actually usable; you can't just copy a ODS-2 hard
disk block-for-block onto a CD and end up with anything usable.
Why not just get yourself a copy of the Hobbyist CD and avoid the
pantomime?
-Rick
