> Message: 18
> Date: Mon, 19 May 2008 17:57:26 -0400
> From: Allison
> ;) Like Blackfin or PIC.
Yup. Nothing like downloading your code into a little 6-pin
cockroach of a PIC only to find it totally unresponsive. Maybe
there's a job description for "electronic psychic". "I've channeled
your PIC and it says you forgot to set up the TRISIO register, you
stupid idiot." :)
Cheers,
Chuck
We have a thread for sightings of vintage computers
in film and TV right? I just spotted a nice IBM 360
installation in "The Girl Most Likely To...", a 1973
black comedy. Selectric console terminal, lots of
3420 tapes drives and a sorter painted blue. It's
the sorter that has a tiny (and technically inaccurate,
but who cares) role in the plot. It's a pretty fun
movie, written by Joan Rivers, and there are a whole
bunch of recognizable TV character actors of the era
in there. Got it on NetFlix.
I came across an application note and software on the Luminary Micro
site <http://www.luminarymicro.com/> implementing subject device. The
application note is the last one on the App Note page and the Software
Update page references the app note.
You can get a device with ethernet and three UARTS for a bit over US$
10 in singles - ARM Cortex processor.
CRC
----------Original Message:
Date: Mon, 19 May 2008 00:21:23 -0700
From: Josh Dersch <derschjo at msu.edu>
Subject: Capacitor values for original PET power supply?
Picked up an original PET 2001-8 awhile back that's been heavily (and I
do mean heavily) modified at various points in its history by someone
with very odd design aesthetics. (See pic at
http://yahozna.dyndns.org/scratch/hackedpet.jpg &
http://yahozna.dyndns.org/scratch/hackedpet2.jpg).
Various parts were hacked in and hot glued (!!) in place or just left to
dangle. When I got it everything was loose inside. There's an
Expandamem board and some homebrew job with some eproms and some hackery
connected to the internal cassette port. There are various switches on
the front and back that do who knows what. The keyboard & tape drive
have been replaced with a different keyboard, alas. (I'll leave finding
those two items for a later date...)
And the power supply's capacitor has been replaced with some huge
Sprague monstrosity larger than a pop can. Haven't even attempted to
power it up since the power supply wiring's all hanging loose and taped
together, but I'm afraid of that capacitor and I'd rather just return
this thing to more or less "original spec" and remove all of this extra
stuff.
Anyone know what the original power supply capacitor was for this
thing? I've found parts lists & schematics for the main PCB, video &
voltage regulator but none of them appear to list this. (I'd also be
interested in knowing the transformer specs & wiring, since I'm probably
going to have to rewire that...)
Thanks,
Josh
----------Reply:
Well, if it were mine I'd clean it up and figure out what's what and how to use
it instead of returning it to the boring "original" spec.
Don't know why you need to replace the cap or rewire the transformer, but
FWIW the original cap is 23,000 at 15; presumably it was increased to deal
with the increased current required by the extra boards. Don't know specs
for the transformer but it and the wiring look stock as far as I can see aside
>from being heavier than the original so I don't see why you'd need the specs.
FWIW, there should be 5 secondary terminals: 7 & 8 are the AC supply for
the monitor, 5 is ground, and 4 & 6 are the two ends of the 8-0-8 secondary.
The EPROMS may be interesting; there were a number of monitors, utilities
etc. supplied in EPROMs, and some disk/tape software packages also used
EPROMs for extra memory and copy protection; at least some of those
switches will be for selecting the EPROM to use. Dump 'em if you can;
they may be rare/useful.
If the keyboard isn't an obvious hack, i.e. if it fits the case and has the PET
graphics characters, it may be original; only the early models had the chiclet
keys and integrated tape drive.
mike
m
A friend of mine - freewheelin at cix dot co dot uk - wants to dispose
of an old PET:
[[
I've got a Commodore PET 8296 (http://tinyurl.com/3totud) and separate
dual disk drive (model 4040 - http://tinyurl.com/3k87vr), both non-working,
which are gathering dust in a corner of my office - if he wants them.
P&P might be rather enormous though, unless there's someone heading from
Wiltshire (near Stonehenge) to Shropshire who can take them on-board?
]]
Anyone interested? Free for the collection.
--
Liam Proven ? Profile: http://www.linkedin.com/in/liamproven
Email: lproven at cix.co.uk ? GMail/GoogleTalk/Orkut: lproven at gmail.com
Tel: +44 20-8685-0498 ? Cell: +44 7939-087884 ? Fax: + 44 870-9151419
AOL/AIM/iChat: liamproven at aol.com ? MSN/Messenger: lproven at hotmail.com
Yahoo: liamproven at yahoo.co.uk ? Skype: liamproven ? ICQ: 73187508
Just came across an interesting nascent site that should be of
interest to the group: "AllPinouts is a Web-based free content project
to collect and list all know pinouts." found at <http://www.allpinouts.org
>.
CRC
> Have they all been scanned and are on line?
Not scanned, but I have the original DEC-Document sources
(like LaTeX) and resulting postscripts and PDF's for RT-11
V5.6 and V5.7 up, e.g.:
http://www.trailing-edge.com/~shoppa/rt56manuals/s1523_pro.pdf
I'm similarly mystified by the previous post to this list looking
for scanned VMS documentation... the original PDF's (not scanned
but again through the DEC-Document->PS->PDF chain) are out
there on the web already.
Tim.
Picked up an original PET 2001-8 awhile back that's been heavily (and I
do mean heavily) modified at various points in its history by someone
with very odd design aesthetics. (See pic at
http://yahozna.dyndns.org/scratch/hackedpet.jpg &
http://yahozna.dyndns.org/scratch/hackedpet2.jpg).
Various parts were hacked in and hot glued (!!) in place or just left to
dangle. When I got it everything was loose inside. There's an
Expandamem board and some homebrew job with some eproms and some hackery
connected to the internal cassette port. There are various switches on
the front and back that do who knows what. The keyboard & tape drive
have been replaced with a different keyboard, alas. (I'll leave finding
those two items for a later date...)
And the power supply's capacitor has been replaced with some huge
Sprague monstrosity larger than a pop can. Haven't even attempted to
power it up since the power supply wiring's all hanging loose and taped
together, but I'm afraid of that capacitor and I'd rather just return
this thing to more or less "original spec" and remove all of this extra
stuff.
Anyone know what the original power supply capacitor was for this
thing? I've found parts lists & schematics for the main PCB, video &
voltage regulator but none of them appear to list this. (I'd also be
interested in knowing the transformer specs & wiring, since I'm probably
going to have to rewire that...)
Thanks,
Josh
