17 Jun
2004
17 Jun
'04
3:21 p.m.
Here is a bit of good mainframe junk recently obtained:
http://users.bestweb.net/~toober/images/3803.front.jpg
http://users.bestweb.net/~toober/images/3803.open.jpg
http://users.bestweb.net/~toober/images/3420.front.jpg
http://users.bestweb.net/~toober/images/3420.open.jpg
Basically, the big blue box is an IBM 3803 Tape Control Unit - the brain
that connects 3420 Tape Units (one of three is pictured) to an S/370 thru
a Bus & Tag channel. The 3803 and two of the 3420s are from 1972, and the
third 3420 may be from 1980. The 3803 apparently works - it was in service
quite recently - but all three of the 3420s have problems. Luckily, I
obtained a full set of MLMs (service binders) for the units, plus some Bus
& Tag cables.
Note the 3803 has a full control panel. It better, as it has more
electronics in it than most minis of the era.
William Donzelli
aw288(a)osfn.org
17 Jun
17 Jun
4:39 p.m.
On Thu, 17 Jun 2004, William Donzelli wrote:
Here is a bit of good mainframe junk recently
obtained:
http://users.bestweb.net/~toober/images/3803.front.jpg
http://users.bestweb.net/~toober/images/3803.open.jpg
http://users.bestweb.net/~toober/images/3420.front.jpg
http://users.bestweb.net/~toober/images/3420.open.jpg
Basically, the big blue box is an IBM 3803 Tape Control Unit - the brain
that connects 3420 Tape Units (one of three is pictured) to an S/370 thru
a Bus & Tag channel. The 3803 and two of the 3420s are from 1972, and the
third 3420 may be from 1980. The 3803 apparently works - it was in service
quite recently - but all three of the 3420s have problems. Luckily, I
obtained a full set of MLMs (service binders) for the units, plus some Bus
& Tag cables.
Note the 3803 has a full control panel. It better, as it has more
electronics in it than most minis of the era.
I've got two 3420s and a 3803. I'm not sure what year they were
manufactured (how can I tell?), or if they work.
--
Sellam Ismail Vintage Computer Festival
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18 Jun
18 Jun
3:32 a.m.
New subject: OT : Tektronix 475A Scope...
Does anyone have a set of schematics or docs? Mine just let all the magic
smoke out. Visual inspection looks like a cap let go, but I would like to
make some measurements [having to use a voltmeter] before I blindly replace
the obviously fried cap.
Please reply to me off list david(a)dynamicconcepts.us.
4:54 a.m.
Cool!
I remember those from the time I was studying. We had 2 of those in one of
our classrooms. AFAIK we got them from some company to play with them, a bit
difficult if you ask me, as there was no controller. So we eventually ended up
to canibalize them for usable electronic parts for whatever project was going on.
I always liked the glass front to slide up and down :)
If I ever can put my hands on one of those myself, then I most likely will convert
it into a small bar like this guy did with a VAX 780 cabinet.
Ed
William Donzelli wrote:
Here is a bit of good mainframe junk recently obtained:
http://users.bestweb.net/~toober/images/3803.front.jpg
http://users.bestweb.net/~toober/images/3803.open.jpg
http://users.bestweb.net/~toober/images/3420.front.jpg
http://users.bestweb.net/~toober/images/3420.open.jpg
Basically, the big blue box is an IBM 3803 Tape Control Unit - the brain
that connects 3420 Tape Units (one of three is pictured) to an S/370 thru
a Bus & Tag channel. The 3803 and two of the 3420s are from 1972, and the
third 3420 may be from 1980. The 3803 apparently works - it was in service
quite recently - but all three of the 3420s have problems. Luckily, I
obtained a full set of MLMs (service binders) for the units, plus some Bus
& Tag cables.
Note the 3803 has a full control panel. It better, as it has more
electronics in it than most minis of the era.
William Donzelli
aw288(a)osfn.org
--
edward(a)groenenberg.net | Collector of PDP-11's.
http://www.groenenberg.net | Politici zijn vieze oplichters.
Unix Lives! M$ Windows is crap.
'97 TL1000S
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