Hi folks,
Well, I've just board swapped the entire VAX into my MicroPDP cab and it
still gets the same error and stops at 3 with an error on the console of
'00000000 03'
Can anyone remember the uVAX I's boot sequence or remember what it's
supposed to do at that point? I've just had a nasty thought in that it might
be looking for the RQDX1 and/or RD52 and it's those that are dead. Can I use
the RQDX3 in there instead?
All *looks* fine with the CPU since it appears to pass its tests.
cheers!
--
Adrian/Witchy
www.binarydinosaurs.co.uk - possibly the UK's biggest online computer museum
www.snakebiteandblack.co.uk - ex-monthly gothic shenanigans :o(
Jim,
Just to clarify, we are NOT trying to regulate the voltage. Just moniotor if the House AC is stable and within "tolerance". If brown outs are common it needs to be logged (even though it does NOT effect the performance of the device).
Also a low A/C voltage may not be providing enough to charge the backup battery.
Therefore none of this is part of the control circuitry, but rather more of a crude A/C voltmeter.
In terms of "how cheap", the company eliminated even low cost items such items as "berg header" type jumpers (less than 1 penny apiece!).
Also by the time it was realized (I am a software consultant to the client on this project and was NOT responsible for the hardware design) that this was an issue, the boards had already been layed-out (and about 150 of them assembled EVEN before a single line of software was written) for the 1000 piece pre-production run.
David
On Jan 26, 11:41, Teo Zenios wrote:
> I have an old matrox Ultima + VLB card that has 2mb vram (consisting
of 8 x KM428C25J-6 chips) and has 8 more sockets for 2mb more memory
(the type where the chip pins are curled around and point to the bottom
of the chip)
If you really meant KM428C256 rather than KM428C25, I've found an SGI
document that says a certain controller was implemented with the
following VRAMs, so presumably they're equivalents or nearly so:
Toshiba TC528257
Mitsubishi M5M482256
Hitachi HM538253
Micron MT42C8255
Fujitsu MB8128xx
NEC uPD482234
TI TMX55160
Vitelec V53C851
Samsung KM428C256
--
Pete Peter Turnbull
Network Manager
University of York
On Jan 26, 11:41, Teo Zenios wrote:
> What's a good online resource to figure out what type of memory chips
you have?
Usually, Google. I didn't find any hits for KM428C25J-6 or KM428C25J
or KM428C25 or ... but I did find some for KM428C256 (which makes more
sense, actually).
The other thing I use is a fairly large collection of data books.
Never discard data books :-) And I just happen to have a Samsung 1994
Product Guide that lists the KM428C256. Being only a Product Guide, it
doesn't give details, but it says its a 2Mbit device organised as 258K
x 8, and there are several speed variants as well as a V256, and
C257/V257.
KM is Samsung. 4 means DRAM, 42 means VRAM. 8 means 8 bits wide. C
means 5V CMOS, V means 3.3V CMOS. 256 is the density and organisation,
in this case 256K Page Mode. 257 means "E/F" mode (I can't think what
that stands for, off the top of my head). J means SOJ (P is DIP, Z is
ZIP, T is TSOP). The -6 means 60ns (-7, -8, -10 are also common).
> I have an old matrox Ultima + VLB card that has 2mb vram (consisting
> of 8 x KM428C25J-6 chips) and has 8 more sockets for 2mb more memory
As you probably know, VRAM is dual-ported RAM, so that the graphics
display hardware can read it without interfering with writes from the
graphics engine or CPU. This particular type is used in some old SGI
video systems.
> (the type where the chip pins are curled around and point to the
> bottom of the chip)
You mean like a PLCC but with pins on only two sides, sort of like a
DIL chip? It's called SOJ, or more specifically, xx-SOJ-y00, where xx
is the number of pins and y00 is the spacing between the two rows in
1000ths of an inch (so 300 means 0.3").
> Are these common chips? Most video cards I have seen either use dram
or edo ram.
I don't think so. But I'm not an expert on video cards.
--
Pete Peter Turnbull
Network Manager
University of York
Found in alt.sys.pdp11:
A few pdp-11s with SCSI adapters seem to be available
in South Wales. I assume there may be some magnetic media
and perhaps documentation to go with them.
Antonio
--
---------------
Antonio Carlini arcarlini(a)iee.org
-------- Original Message --------
Subject: Machines Available
Date: Mon, 26 Jan 2004 15:17:52 +0000
From: apyule(a)apyule.demon.co.uk
Reply-To: apyule(a)bRITcOMPsOC.org.uk
Newsgroups: alt.sys.pdp11
I am retiring in the near future and will be scrapping the following.
PDP 11/44 with Emulex UC18 SCSI controller and discs, two Magnetic tape
controllers and drives, Ethernet controller, two RL02 controller and
drives, Terminal controllers. A number of spare boards. This machine is
in working order. In fact I have been running it for a few hours a day
recently to erase magnetic tapes and discs.
PDP 11/73 with Emulex UC07 SCSI controller and disc, magnetic tape
controller and Ethernet controller. This does not boot at the moment. I
am not sure of the problem.
PDP 11/23 (just processor and memory).
This has not been powered up for a few years.
MicroVax 2000 with extra disc drive and non working TK50
This machine is in working order.
MicroVax II
This machine was my partner's old machine. He retired three years ago
and the machine has not been powered up since then.
The above are all in the South Wales (UK) area near Cardiff. Items will
need to be collected. I do not want any money for complete machines.
If you are interested in having any of the above then please send me an
email to the address given in the signature. Note that, due to the
amount of spam I receive, I will not receive replies made to the demon
address. Please respond before 2nd February.
--
Tony Yule
e-mail: apyule(a)bcs.org.uk
God made the integers, man made the rest. (Leopold Kronecker)
--
---------------
Antonio Carlini arcarlini(a)iee.org
I need something to be crated and shipped from Boonton, New Jersey. I'd
like to hire some willing (or not) person to get the materials needed from
the local hardware store and crate the item up. I figure it'll take
around two hours. I need it done ASAP.
If you're interested, please contact me directly.
Thanks!
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
[ Old computing resources for business || Buy/Sell/Trade Vintage Computers ]
[ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]
It's rare that I find a unique and interesting computer these days. This
Mitac LIC-2001A Little Intelligent Computer is one such. Apparently, it
was marketed in Japan because it has the Katakana (I think) character set
painted onto the keycap fronts, but otherwise is a standard QWERTY
keyboard layout.
The back connectors include:
1) Power
2) Joystick (a 16-pin DIP socket mounted on its side!)
3) Tape In
4) Tape Out
5) TV (the jack of an RF modulator)
6) Expansion
7) Drive 1
8) Drive 2
9) Printer
10) Monitor (RCA type jack)
11) 80 Column (RCA type jack)
Now, as I typed this, I started to sense something familiar, especially
when I took into account the pin count on the disk drive connectors, and
especially with the joystick port. I do believe this is an Apple ][+
clone. I opened it up and it has a 6502 and a Z80 onboard, with three
ROMs and lots of RAM chips, sort of like many ][+ clones I've seen (I have
at least a couple or three other ][+ clones with 6502 and Z80 on-board).
I just can't verify this by booting it up because it has a very funky
power connector which requires an external power supply of some sort
(which I didn't get with this).
Anyone ever heard of this? The web turns up empty.
--
Sellam Ismail Vintage Computer Festival
------------------------------------------------------------------------------
International Man of Intrigue and Danger http://www.vintage.org
[ Old computing resources for business || Buy/Sell/Trade Vintage Computers ]
[ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]
Hi
Always wrap the item in some plastic wrap when bring
it into a warmer environment. The condensation can do
quite a bit of damage. You want it to come up to temperature
before exposing it to the wetter warm air.
Dwight
>From: "Tom Jennings" <tomj(a)wps.com>
>
>One of the best things to do is also the easiest: move them inside and
>leave them, untouched, in a dry place for 24 or more hours.
>
>
>
>
>On Sun, 2004-01-25 at 13:32, David V. Corbin wrote:
>> The largest problem will be condensation. If moisture accumulates, it fill
>> mix with any contaminants to produce a nice conductive film which can
>> destroy (short out) all of the electronics on power up.
>>
>> The second (and much easier to deal with) is mechanical tolerance issues.
>> Things contract when they get cold and expand when warming up (we all know
>> this). If the devices are turned on (especially older items) the effects can
>> be significant enough that the mechanics will be out of tolerance and bind
>> and possible bend or break. This is easily cured by NOT turning them on
>> until they have completely reached room temperature.
>>
>> As I said, the moisture problem is much more severe. If the items are packed
>> in SEALED packaged with a decent amount of Sodium Silicate (or other drying
>> agent) this should not be much of a problem. But (unfortunatley) we usually
>> dont pay this much attention when packing "average" gear for storage.
>>
>> One technique I have used successfully is to (at least partially)
>> disassemble the device [covers off at a minimum] while it is still extremely
>> cold. After my finger thaw out, I will then bring it in to an enclosed area
>> that has almost no humidity (hot air heating, dehumidifier, chemical water
>> absorbers) and let it warm up in there. This will usually eliminate the
>> formation of and condensate.
>>
>>
>> Hope this helps.
>>
>> David.
>>
>>
>> -----Original Message-----
>> From: cctalk-bounces(a)classiccmp.org
>> [mailto:cctalk-bounces@classiccmp.org]On Behalf Of Mike
>> Sent: Sunday, January 25, 2004 4:03 PM
>> To: cctalk(a)classiccmp.org
>> Subject: Effect of COLD
>>
>>
>>
>> Is there any problem with data stored in a garage when the temperature drops
>> to -20? I just found out where my moved a bunch of my machines (Cromemco,
>> nabu, pets, Tandy's).
>>
>> Any precautions to take when moving them back indoors?
>>
>> Mike
>>
>> --
>> Ottawa, Canada
>>
>> Collector of vintage computers
>> http://www.ncf.ca/~ba600
>
Hi
To save these, first freeze them to stop damage.
Find some palce that does freeze drying.
Dwight
>From: "Boris Gimbarzevsky" <borisg(a)unixg.ubc.ca>
>
>Recently I had a flood in a storage room and a number of computer books
>unfortunately got soaked. They are drying, but as some of them are
>starting to grow rather colorfull fungi, and I've been told they have to
>go. In the interests of maintaining domestic tranquility, the following
>material is available to whoever wants to pay me to ship it to your address
>(they will be dry when shipped):
> PDP-8/L handbook
> Laboratory computer handbook (on programming the PDP-12)
> Complete copy of Inside MacIntosh manuals.
> Megamax C manual for MacIntosh (I don't know where the disks are)
> Byte Magazines from 1988 and thereabouts (when Byte was worth reading).
>
>If anyone is interested, contact me off list at:
>borisg at unixg dot ubc dot ca and use the string "Aaardvark" in the
>subject line to get past my spam filter.
>These materials are going into the garbage in 4 weeks if there is no interest.
>
>Boris Gimbarzevsky
>
>
>
I have a Western Digital WD1007A 10MHz ESDI disk controller that I'd like to trade for an Adaptec ACB-2370 MFM controller. The thing came out of a working system, so I have no reason to believe it's anything other than usable.
Anyone help on this?
Thanks much.
-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner & Head Hardware Heavy,
Blue Feather Technologies -- http://www.bluefeathertech.com
kyrrin (at) bluefeathertech do/t c=o=m
"If Salvador Dali had owned a computer, would it have been equipped with surreal ports?"
