<alcohol. Now I'm just soaking the heads in a glass in the alcohol, and
<waiting overnight to see if they'll then come clean. If that fails, I was
<wondering about a toothbrush with just 91% alcohol.
NO! Try a Qtip with some acetone (nail polish remover) and then clean that
off with isopropanal.
There are plenty of more aggresive cleaners before resorting to abrasives.
When my RL02 crashed (bad pack) I had to use MEK on the heads to get them
clean. Isopropanal or ethanol are about the most mild solvents and someof
the media binders need some push.
Allison
In a message dated 8/10/99 3:30:46 PM EST, ard(a)p850ug1.demon.co.uk writes:
<< We've had many discussions here about whether it is better to restore a
machine (and thus instal unoriginal parts) or whether it is better to
keep everything original and live with it not working. For me, there is
no contest here - I like to use my old machines, and thus I try to get
them working. Fixing them is half the fun anyway :-). >>
I agree! I like stuff I can use. The only non-working stuff I keep (besides
packaging material ;>) is that which has spare parts for my working machines,
or machines I hope to acquire in the future.
<< Ooops... I thought almost everyone here was short of space... >>
Well, some of us collect the "small" stuff & we can get a lot of it on a five
foot shelf ;>) I'm also blessed with a wife who understands my hobby (if I'm
tinkering with this crap she knows where I am . . .)
<< People here have made some good points as to why I should keep the
original box, so for the moment at least, it stays. >>
Right on! The dumpster loses again!
Regards,
Glen Goodwin
0/0
Ok, I know this sounds crazy....
One person told me that if the heads were heavily oxidized, that they could
be cleaned with a soft toothbrush and TOOTHPASTE (followed by a rinsing in
91% alcohol)???????
Anyone know if this is crazy or advisable?
TIA
Jay West
A company in Richardson, Texas wants to get rid of some fairly classic
stuff.
I've personally seen all this stuff, but it was almost two months ago and
I've forgotten what a lot of it is. However, if you have a question about
anything, please e-mail me and I'll try to get it answered for you.
The price for this stuff is open ended. My guess is that in most cases
they will want some token amount, or may even be happy for you to come and
take it away. I'll act as the go-between so any offers you want to make
should be mailed to me and I'll forward them on for you. Please include
an e-mail address and a telephone number.
Here is the list:
Texas Instruments 1500 (1 bay)
Archive tape drive
8-port TI hub
Texas Instruments 1500 (8 bay)
Archive tape drive
8-port TI hub
Texas Instruments 300 Business System Terminal
Texas Instruments Business System 300 (blows fuse after a minute)
IBM PC/XT w/System/36 interface board
IBM PC monochrome display
IBM System/36 Desktop (Type 5364)
ADP PC/AT (no P/S)
ADP MAX 8500 (dead)
Archive tape drive
(2) 4-port networking hubs
Motorola SYS3304NY151
Archive tape drive
Texas Instruments System 1000
Archive 150MB tape drive
TI System V Xemix 386 by SCO
Manuals
Texas Instruments System 1000
(3) NEC N4810II modem
(2) Racal-Vadic VA212 audto-dial modem, AC adapter, cables, manuals
DIS System 36 (bad hard drive)
IBM monitor
CITOH 8510 printer
Texas Instruments Omni 800 printer
Sperry IT (PC/AT with SCO Xenix)
Unisys color monitor
Priority will go to those who can offer local pickup, since the company
doesn't want to have to deal with having to ship stuff if they can avoid
it (in fact, I don't know that they even want to ship anything, but I'll
find out).
The company wants to ditch this stuff soon so act fast or else it might be
scrapped.
Sellam Alternate e-mail: dastar(a)siconic.com
------------------------------------------------------------------------------
Don't rub the lamp if you don't want the genie to come out.
Coming this October 2-3: Vintage Computer Festival 3.0!
See http://www.vintage.org/vcf for details!
[Last web site update: 05/25/99]
My 1984 catalog indicates that it processes video signals, both analogue and
digital. It appears, from the cables offered that the analog is a 75 ohm BNC
and the digital is a 15 pin, prob. D sub Centronics type. Nothing indicates
that it could be used with the 4051, also in this catalog.
It's recording technique processes raster scan video with a fiber optic CRT.
It does use both kinds of Tek dry silver paper, switch selectable. The High
performance paper 7772 is capable of 125 lines per inch(LPI). The regular
7770 paper does 100 LPI.
There is a RGB Mixer available for color to mono conversion. I may have a new
one in a box if you get the 4634. The printer, new, comes with a roll of
paper, 75 ohm terminator and manual. If it is new in the box I sure would
recommend getting it. Few of these exist because they are valuable as scrap
metal.
In 1984 Tek wanted $7900 for this printer. A roll of paper cost $215, a case
$750.
If your Tek 4051 has a 15 pin video out in the back it might hook up to this
printer. The connector on the printer is not a Tek GPIB port.
Paxton
I just secured a block of 20 rooms at the Biltmore Hotel and Suites in
Santa Clara for VCF 3.0. This is the same hotel we used last year, and
they were very good to us.
The room rate is $69 or $89 a night depending on how much you want to
spend. I stayed a night in each room (the regular rooms and the tower
suites) last year and both were comfortable and clean (of course the tower
suites were much nicer :) $69 a night for a room in Santa Clara is a
prtty damn good deal actually.
All the information you would need to reserve a room can be found at:
http://www.vintage.org/vcf/hotel.htm
Act soon. The deadline to register at the VCF rate is September 3. Be
sure to ask for the Vintage Computer Festival room rate. If you have
trouble you can probably ask for Sabina, whom I negotiated with. Please
e-mail me as well if you do.
Sellam Alternate e-mail: dastar(a)siconic.com
------------------------------------------------------------------------------
Don't rub the lamp if you don't want the genie to come out.
Coming this October 2-3: Vintage Computer Festival 3.0!
See http://www.vintage.org/vcf for details!
[Last web site update: 05/25/99]
<> One person told me that if the heads were heavily oxidized, that they cou
<> be cleaned with a soft toothbrush and TOOTHPASTE (followed by a rinsing i
<> 91% alcohol)???????
Don't. has that person ever dealt with ceramic heads?
Clean it with 91% ISOPROPANAL (alcohol). inspect first during and after.
Most heads are ceramic and oxidized is not likely.
Allison
Various people said:
>> > The Commodore 64 _could_ run CP/M programs...provided one had the
>> > optional Z80 cartridge...though I never tried myself. :-) The 128 was the
>> > first Commodore machine to actually boot CP/M disks with a 1571 drive,
if I
>> > remember correctly.
>>
>> Well so _could_ the PDP-8 if someone built the necessary hardware or wrote
>> a simulator for it :)
>
>And so can a Macintosh if you run a terminal emulator and connect the
>serial port to a Northstar Horizon. :-)
I point is that Commodore had the foresight to put a "DMA" line
on the Expansion Port so that an external device could tri-state
the address lines on the 6510, effectively removing the 6510 from
the memory map. Which makes it very easy to run the C64 with multiple
processors or just a different processor.
The C64 CP/M cartridge was set-up so that you could have 6502 code
embedded in your Z80 code. You just need to set a certain register
every time you wanted to switch processors.
That coupled with the fact that you could swap out all the ROM and
all of the I/O leaving a continue 64K ram space, makes the C64 a
hardware hacker's dream.
Just my two cents.
--Doug
===================================================
Doug Coward dcoward(a)pressstart.com (work)
Sr Software Engineer mranalog(a)home.com (home)
Press Start Inc. http://www.pressstart.com
Sunnyvale,CA
Visit the new Analog Computer Museum and History Center
at http://www.best.com/~dcoward/analog
===================================================
I finally got around to putting a new lower platter into my 7900A. Kinda
hard to do from underneath, but it's done.
Now I'm getting ready to take the lower heads out for thorough cleaning.
Before I do, I wanted to ask some advice... When I powered the drive up
before, I could hear minor HDI (very slight scraping). Upon inspection it
was obviously the lower platter that was missing a track of oxide. The heads
had oxide on them but they didn't look all that bad to me. Most of the folks
on the list (and a few people I talked to voice) said just replace the lower
platter and clean the bottom heads and all would probably be well. Two
questions:
1) Everyone said because the lower platter is fixed, there's no concern for
alignment, precision, feeler guages, etc. Just unbolt the heads, clean 'em,
and bolt 'em back on. No special checks and so forth. Before I unbolt them I
wanted to double check and make sure I wasn't about to do anything silly.
So - just unbolt, remove, clean, rebolt, and power up?
2) I was thinking (bad sign <grin>)...if the heads contacted the platter
enough to scrape off a nice circle of oxide, won't cleaning the heads and
replacing the platter accomplish nothing? What I mean is - isn't it very
likely that whatever caused them to scrape in the first place won't be fixed
by a new lower platter and cleaned heads? What am I missing here?
Thanks in advance for the education on 14" hard discs!
Jay West
Here's an interesting company that purports to be in the business of:
"Supporting clients with older, "obsolete" computer
equipment, including, but not limited to, DEC PDP-11's,
PERQ graphic workstations, various workstations and
other machines running UNIX, DEC VAXen, and various
personal computers running CP/M, MP/M and MS-DOS."
http://www.perqlogic.com
Sellam Alternate e-mail: dastar(a)siconic.com
------------------------------------------------------------------------------
Don't rub the lamp if you don't want the genie to come out.
Coming this October 2-3: Vintage Computer Festival 3.0!
See http://www.vintage.org/vcf for details!
[Last web site update: 05/25/99]
