> Hi Jason:
>
> This is just a guess, but I think that the 'blown capacitor' problem is
> directly related to the 'TYCO' power supply. It's output IS going to be
> _very_ noisy, when compared to computer grade supplies. The peak voltage
> is probably what's killing things. I would look for an 18v supply.
>
> Chuck
That's what I thought. I have 2 of the WANG WLTC's (that's why I'm trading
one). The other one has worked fine for about 1 year (and longer with the
previous owner) with the Tyco supply. The other keeps blowing. I think
it's being caused by some weak components elsewhere in the circuit (some of
the other caps may be beginning to deteriorate).
--
-Jason
(roblwill(a)usaor.net)
ICQ#-1730318
PS>> Your date is 8 months off - it's set for January 30 1998.
> There is, however, a problem with the internal (regulating/switching)
< > supply. It runs the computer, but keeps blowing a capacitor. It als
< > needs an external P/S and battery. The battery is 10 sub-cells (with
< > resistor - I have a schematic). A Tyco 20VDC racing transformer (the
< > for the little car/track sets) will run it.
< This is just a guess, but I think that the 'blown capacitor' problem is
< directly related to the 'TYCO' power supply. It's output IS going to be
< _very_ noisy, when compared to computer grade supplies. The peak voltag
< is probably what's killing things. I would look for an 18v supply.
<
< Chuck
Good point. the answer is simple... What is te voltage rating of the
failed cap? Likely the tyco power far exceeds the required voltage.
Allison
Can someone help this person out? If so reply directly to her at
the address below.
Thanks.
------- Forwarded Message Follows -------
From: "AUDREY" <kutter(a)arn.net>
Subject: RE: IBM XT286
Date sent: Tue, 29 Sep 1998 22:17:22 -0500
I hope you can help me with my problem ,as you can see I have
this old
machine . I had to replace the battery and now I can't bring
anything up.
I can't even get the to the C: prompt. This one has a Conner hard
drive,
this is the information on the drive : Conner,CP 30064H ACO3286
CP30064H
9027 CMO2322 3GT 2.55 ML2 T ALR POWERFLEX FLYER HARD
DRIVE:60MB TYPE:6
S/N0361634. I don't have a manual or a systems disk for this
machine.
Every time I try to run setup this is the message I get back : device
I/O
error I get this message with every thing iI try. If you have a manual
or
a systems disk can you make a copy and I will buy them from you.
If you
can help me set this thing up will you send the information in a
way a 55
year old granny can understand . I want my grandson to learn on it.
I'm
sorry this is so long .
Thank You,
Audrey
-----
David Williams - Computer Packrat
dlw(a)trailingedge.com
http://www.trailingedge.com
>The only PC ESDI controllers I have ever found all have 2 data cable
>connectors (20 pin on the card), which can each connect to one drive
>only, same as MFM. In fact right now I can't think of any differences
>between ESDI and MFM cabling for PC's. Not sure about the twist details
>though.
I have one of the Andromeda ESDC controllers for qbus pdp-11s, and it
has four connectors on it. One wide one (like the wide MFM one) and
three of the narrow ones. According to the documentation I have, one
could attach up to three drives to the one controller, possibly up
to six with some sort of adapter... (It also support floppies with
an adapter, but I don't have that)
Megan Gentry
Former RT-11 Developer
+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com |
| Unix Support Engineering Group | (home): mbg!world.std.com |
| Compaq Computer Corporation | addresses need '@' in place of '!' |
| 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ |
| Nashua, NH 03062 | "pdp-11 programmer - some assembler |
| (603) 884 1055 | required." - mbg |
+--------------------------------+-------------------------------------+
Questions came up last week about how much power a DECsystem-1090 CPU (KL10)
consumes, and how the power supply works. Tony Duell suggested that the KL10
might not consume any more power than a big PDP-11/45 system; I disagreed.
My previous description of the power system was not entirely accurate, so I've
dug out some technical documentation, including the manual "Power System
(1080/1090) Interface Description", part number EK-PWR1-ID-002, dated March
1977.
The KL10 CPU cabinet consists of three bays. In a 1080 or 1090, the middle
bay contains the main CPU card cage, which has 47 extended hex modules full
of ECL logic.
The left bay (as viewed from the front) contains an I/O card cage containing
up to 50 extended hex modules full of TTL for the RH20 Massbus channels, DTE20
front-end interfaces, DMA20 memory bus interface, and DIA20 I/O bus interface.
The right bay contains a PDP-11/40 front end processor, a TU56 dual DECtape
transport, and a TC11 DECtape control.
Note that this does not include any memory or peripherals necessary to
make a complete system. I am going to describe only the power requirements
of the CPU cabinet.
All KL10 models require three-phase power. The KL10-AA and KL10-BA models
operate on three phases of 90-132 VAC 60 Hz (208 VAC nominal phase-to-phase)
The KL10-AB and KL10-BB operate on three phases of 180-264 VAC 50 Hz (416V
nominal phase-to-phase). Total input power is specified as 12.6 kW typical
for a basic system; a real-world configuration would have more DTE20 and
RH20 units, so it would consume more power.
Needless to say, the power supplies in the KL10 are not power factor
corrected. The 863 three-phase power control has a 75A main circuit breaker.
Unfortunately I do not have a copy of the DECsystem-10 Site Preparation Guide,
so I don't know what the actual specifications for peak current per phase
are.
With the exception of the power supply for the main CPU cage and the cooling
fans for that bay, most of the machine actually operates on single phase
power. The various fans and power supplies are distributed between the
phases to balance the load.
The CPU cage fans operate between two phases (208V) in the -AA and -BA models,
and between one phase and neutral (240V) in the -AB and -BB models.
The power supply for the ECL consists of an H760A or H760B raw power supply
(depending on the line voltage), a 70-09475 capacitor assembly, and an H761
regulated series pass assembly.
The H760A/B contains three ferroresonant transformers with primaries wired in
a three-phase delta. The secondaries are center-tapped and wired with
half-wave bridge rectifiers. The output is -12V at 490A. The diodes are
mounted to a massive heat sink with its own fans.
The capacitor assembly consists of thirteen 0.3F capacitors in parallel for
a total capacitance of 3.9F. The output under full load is -11V+-10%.
In the event of a power failure, this is sufficient to allow a hold time
of 20 ms before the voltage drops below -7.5V.
The H761 regulated series pass assembly consists of 13 linear regulators.
Nine have -5.2V 35A outputs for the ECL main power, and four have -2V 35A
outputs for ECL termination. There is room for a 14th linear regulator
which is normally not installed.
The maximum load for the CPU card cage is thus (9*5.2V*35A)+(4*2.0V*35A), or
1918W. At that load, the input power required by the power supply is
over 5460W. This is less than 35% efficiency.
Of course, the ECL power supply is nowhere near the whole story.
The following additional power supplies are in the system:
quant model output use
----- ----- ------ --------------
1 H720 +5, -15 DECtape system
1 H725
1 H7420 AC power supply PDP-11/40
3 H744 +5
1 H745 -15
1 H754 +20, -5
1 H732 0-20VDC margin check
1 783-C +10, -15
1 H7420 AC power supply
1 H744 +5V CPU cage TTL supply
2 H744 +5V I/O cage DTE20 TTL supply
1 H744 +5V I/O cage RH20 TTL supply
1 H7420 AC power supply
4 H744 +5V I/O cage RH20 TTL supply
1 H7420 AC power supply
1 H770 +15V air flow sensors
1 H745 -15V I/O cage DIA20/DMA20
3 H744 +5 I/O cage DIA20/DMA20 TTL supply
I have not found any figures for typical current used by the various
subsystems. However, the ratings of the regulators are:
H720 5V 22A, -15V 10A, unregulated -22V 1A, unregulated +8V 1.5A
(unregulated outputs not used in KL10)
H732 0-20V 5A
H744 5V 25A
H745 -15V 10A
H754 +20V 8A and -5V 1A
H770 +15V 10A
DEC didn't waste any more money on regulators than necessary, so it is
a safe assumption that a fully configured system will use most of the
available DC power, which for just the +5V supplies alone is 1860W.
Fortunately the power supplies used with the H7420s are switchers, so they
are probably at least 65% efficient.
Eric
>> ESDI cables for PC's may or may not have a twist. The drive has a jumper
>> (usually marked drive 1 or 2) that must be set accordingly.
>
>I was under the impression that ESDI used 3 binary-encoded lines to
>select up to 8 drives on the same cable, and that there was no way just
>by swithing them round to have all the drives set to the same number.
>Certainly the ESDI drive I've just picked up has 3 binary-encoded
>selection links on the logic board. Of course for the special case of
>drive 1 and drive 2 (although not drive 0 and drive 1) you can get away
>with swapping over bits 0 and 1.
The only PC ESDI controllers I have ever found all have 2 data cable
connectors (20 pin on the card), which can each connect to one drive only,
same as MFM. In fact right now I can't think of any differences between ESDI
and MFM cabling for PC's. Not sure about the twist details though.
I contacted a friend of mine that that is a salesman for IBM and asked him
if he knew where any IBM 1130s might be found. Here's his reply:
>
>Joe,
>Sorry it took so long to reply....I was in Vegas and didn't get back until
>yesterday. It was the annual World Gaming Congress meeting...the largest
>gaming convention in the industry.
>
>Well...I got to admint....I've never even heard of an 1130!! I had to do
>some research to find out what it was! from what I can decuce..this thing
>dates back to the mid 60's.!! Sorry but the only place I can think he might
>find one is a museum!
Joe
Hello everybody.
I have a WANG WLTC laptop computer (circa 1980's). I do not want to sell
it for cash, but I'd be willing to trade it for another unusual
portable/laptop.
Here's some specs on it:
-NEC V30 (8086) processor
-10MB Winchester Disk
-External Centronics-type SCSI port (HD is also SCSI)
-Built-in thermal printer, with roll/cut sheet capabilities
-512K RAM
-RS232-C Serial port
If you're interested in it, email me, and I can send you more info and/or a
picture of it.
There is, however, a problem with the internal (regulating/switching) power
supply. It runs the computer, but keeps blowing a capacitor. It also
needs an external P/S and battery. The battery is 10 sub-cells (with a
resistor - I have a schematic). A Tyco 20VDC racing transformer (the kind
for the little car/track sets) will run it.
I had an offer to trade it for an IBM PC-Radio, but I never got a reply.
If anyone has one of these, or any other odd or unusual laptops/portables,
and would be willing to trade, let me know.
ThAnX,
--
-Jason
(roblwill(a)usaor.net)
ICQ#-1730318
Someone posted recently that they have the originals (or copies) of
Windows 1.0? Could you please get in touch with me?
Sam Alternate e-mail: dastar(a)siconic.com
-------------------------------------------------------------------------------
Ever onward.
Coming in 1999: Vintage Computer Festival 3.0
See http://www.vintage.org/vcf for details!
[Last web site update: 09/21/98]
Tony Duell wrote:
>>
>> As far as I can tell the cables required for a single ESDI drive are the
>> same as for a MFM drive. Is this correct?
>
>AFAIK yes, provided there are no twists in them. Some PC control (34 pin)
>cables have twists so you can set all the hard drives to the same drive
>number. This doesn't work with ESDI.
>
>And no, I am not confusing this with a PC floppy cable, which also has a
>twist, but in a different place.
>
>But the ESDI cables are standard 20 pin (radial data) and 34 pin
>(control) cables.
ESDI cables for PC's may or may not have a twist. The drive has a jumper
(usually marked drive 1 or 2) that must be set accordingly.
I've had a lot of trouble getting old ESDI drives to work also, especially
with Western Digital controllers. I thought all my drives were bad until I
found a Future Domain controller that worked with most of them. The drives
also need to be low level formatted by the card being used.
Hans Olminkhof
